Agilent E364xA Dual Output DC Power Supplies User’s and Service Guide Agilent Technologies
Notices © Agilent Technologies, Inc., 2000–2013 Warranty No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. The material contained in this document is provided “as is,” and is subject to change, without notice, in future editions.
Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument. Caution, risk of danger (refer to this manual for specific Warning or Caution information) In position of a bi-stable push control DC (Direct current or voltage) Terminal is at earth potential. Used for measurement and control circuits designed to be operated with one terminal at earth potential.
Safety Considerations Read the information below before using this instrument. The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer’s failure to comply with these requirements.
WA R N I N G • Do not use MAINS supply cords by inadequately RATED cord. Always use the MAINS supply cord provided by the manufacturer. • Do not use the device if it appears damaged or defective. REMOVE POWER and do not use the device until safe operation is verified by service-trained personnel. If necessary, return the device to Agilent for service and repair to ensure that the safety features are maintained. • Do not operate the device around flammable gases or fumes, vapor, or wet environments.
Safety and EMC Requirements This power supply is designed to comply with the following safety and Electromagnetic Compatibility (EMC) requirements: • IEC61326-1:2005/EN61326-1:2006 • Canada: ICES/NMB-001: Issue 4, June 2006 • Australia/New Zealand: AS/NZS CISPR11:2004 • IEC 61010-1:2001/EN 61010-1:2001 • Canada: CAN/CSA-C22.2 No. 61010-1-04 • USA: ANSI/UL 61010-1:2004 Environmental Conditions This instrument is designed for indoor use.
Regulatory Markings The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives. The C-tick mark is a registered trademark of the Spectrum Management Agency of Australia. This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992. ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001.
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product. The affixed product label is as shown below.
Declaration of Conformity (DoC) The Declaration of Conformity (DoC) for this instrument is available on the Agilent Web site. You can search the DoC by its product model or description at the Web address below. http://regulations.corporate.agilent.com/DoC/search.htm NOTE E364xA User’s and Service Guide If you are unable to search for the respective DoC, contact your local Agilent representative.
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
Table of Contents 1 Getting Started Introduction 2 Standard Shipped Items Options 6 Accessories 7 6 Preparing the Power Supply 8 Checking the power supply 8 Connecting power to the power supply Checking the output 10 Converting line voltage 12 Rack-mounting the power supply 14 9 Product at a Glance 17 Front panel 17 Rear panel 20 Display annunciators 21 Output Connections 23 Current ratings 23 Voltage drops 24 Load consideration 24 Remote voltage sensing connections Multiple loads 29 Operating the Po
Constant Voltage Operation 34 Front panel operation 34 Remote interface operation 36 Constant Current Operation 36 Front panel operation 36 Remote interface operation 38 Track Mode Operation 38 Front panel operation 39 Remote interface operation 39 View Menu Operation 40 Changing the display mode 40 Viewing the errors 41 Viewing the firmware revision 41 Viewing the calibration string 42 Configuring the Remote Interface GPIB configuration 43 RS-232 configuration 43 42 Storing and Recalling Operating Stat
Error conditions 54 Firmware revision query 54 SCPI language version 55 GPIB Interface Reference 56 RS-232 Interface Reference 57 RS-232 configuration overview 57 RS-232 data frame format 58 Connection to a computer or terminal RS-232 troubleshooting 60 58 Calibration 61 Calibration security 61 To unsecure for calibration 62 To secure against calibration 63 To change the security code 64 Calibration count 65 Calibration message 66 3 Remote Interface Reference SCPI Command Summary 68 Introduction to
Selecting a trigger source 81 Power supply programming ranges 82 Using the APPLy Command 83 APPLy {| DEF | MIN | MAX}[,{| DEF | MIN | MAX}] 83 APPLy? 83 Output Settings and Operation Commands 84 Triggering Commands 92 Trigger source choices 92 Triggering commands 94 System-Related Commands State Storage Commands Calibration Commands Calibration example 95 99 101 104 Interface Configuration Commands 106 SCPI Status Registers 107 What is an event register? 107 What is an enable regi
Halting an Output in Progress 124 SCPI Conformance Information SCPI confirmed commands Device-specific commands 125 125 127 IEEE-488 Conformance Information 128 Dedicated hardware lines 128 Addressed commands 128 IEEE-488.
Parallel connections Remote Programming 7 164 165 Characteristics and Specifications Physical Characteristics 170 Environmental Characteristics Electrical Specifications 172 Supplemental Characteristics 8 172 174 Service and Maintenance Overview 178 Operating Checklist 179 Types of Service Available 180 Standard repair service (worldwide) Repacking for Shipment 181 Electrostatic Discharge (ESD) Precautions Surface Mount Repair 180 182 183 Replacing the Power-Line Fuse 183 Troubleshoot
Test Considerations 191 Operation Verification and Performance Tests Operation verification tests 192 Performance tests 192 Measurement Techniques 193 Common test setup 193 Current-monitoring resistor 194 General measurement techniques Electronic load 195 Programming 195 192 194 Constant Voltage (CV) Verifications 196 Constant voltage test setup 196 Voltage programming and readback accuracy CV load effect (load regulation) 198 CV source effect (line regulation) 199 CV PARD (ripple and noise) 200 Load t
Front panel voltage and current calibration Calibration Record 217 221 Calibration Error Messages 222 Component Locator Diagram 225 Component locator diagram for the main board assembly — top 225 Component locator diagram for the main board assembly — bottom 226 Component locator diagram for the digital board assembly — top 227 Component locator diagram for the digital board assembly — bottom 228 Component locator diagram for the front panel — top 229 Component locator diagram for the main board assemb
List of Figures Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5 Figure 1-6 Figure 1-7 Figure 2-1 Figure 2-2 Figure 2-3 Figure 3-1 Figure 3-2 Figure 5-1 Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8 Figure 7-1 Figure 7-2 Figure 8-1 Figure 8-2 Figure 8-3 Figure 8-4 Figure 8-5 Figure 8-6 E364xA User’s and Service Guide Rear output terminals 5 Line voltage selector (set for 115 Vac) 12 Front panel 17 Voltage and current limit settings 19 Rear panel 20 Display a
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
List of Tables Table 1-1 Table 1-2 Table 1-3 Table 1-4 Table 1-5 Table 1-6 Table 1-7 Table 2-1 Table 3-1 Table 3-2 Table 3-3 Table 3-4 Table 3-5 Table 3-6 Table 3-7 Table 3-8 Table 4-1 Table 4-2 Table 4-3 Table 7-1 Table 7-2 Table 7-3 Table 8-1 Table 8-2 Table 8-3 Table 8-4 Table 8-5 Table 8-6 Table 8-7 Table 8-8 Table 8-9 Table 8-10 E364xA User’s and Service Guide E364xA options 6 E364xA accessories 7 E364xA power-line fuse 9 Front panel overview 17 Rear panel overview 20 Display annunciators overview 21
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
E364xA Dual Output DC Power Supplies User’s and Service Guide 1 Getting Started Introduction 2 Standard Shipped Items 6 Preparing the Power Supply 8 Product at a Glance 17 Output Connections 23 Operating the Power Supply 30 This chapter guides you to set up your power supply for the first time. An introduction to all the features of the power supply is also given.
1 Getting Started Introduction Introduction The Agilent E3646A/E3647A (30 W) and E3648A/E3649A (50 W) are high performance dual output dual range programmable DC power supplies with GPIB and RS- 232 interfaces. The combination of bench- top and system features in these power supplies provides versatile solutions for your design and test requirements.
Getting Started Introduction 1 The E364xA power supplies feature a combination of programming capabilities and linear power supply performance that makes them ideal for power systems applications. The E364xA power supplies may be programmed locally from the front panel or remotely over the GPIB and RS- 232 interfaces. The E364xA power supplies have two ranges, allowing more voltage at a lower current or more current at a lower voltage.
1 Getting Started Introduction • Viewing the errors, calibration string, or system firmware revision • Enabling or disabling the Tracking mode • Calibrating the power supply, including changing the calibration secure code • Configuring the remote interface • Enabling or disabling the output When operated over the remote interface, the E364xA power supplies can be both a listener and a talker.
Getting Started Introduction WA R N I N G 1 Floating the power supply output at more than ±60 Vdc from the chassis presents an electric shock hazard to the user. Do not float the outputs at more than ±60 Vdc when uninsulated sense wires are used to connect the (+) output to the (+) sense and the (–) output to the (–) sense terminals on the back of the unit. Figure 1-1 Rear output terminals E364xA User’s and Service Guide 1 Float voltage ±60 Vdc Max to without insulation).
1 Getting Started Standard Shipped Items Standard Shipped Items Verify that you have received the following items in the shipment of your power supply. If anything is missing or damaged, contact your nearest Agilent Sales Office. ✔ Power cord ✔ Certificate of Calibration ✔ E364xA User’s and Service Guide (this manual) ✔ E364xA Quick Reference Card Options Options 0EM, 0E3, and 0E9 determine which power- line voltage is selected at the factory.
Getting Started Standard Shipped Items 1 Accessories The accessories listed below may be ordered from your local Agilent Sales Office either with the power supply or separately. Table 1-2 E364xA accessories Part number Description 10833A GPIB cable, 1 m (3.3 ft.) 10833B GPIB cable, 2 m (6.6 ft.) 34398A • RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.
1 Getting Started Preparing the Power Supply Preparing the Power Supply Checking the power supply 1 Check the shipped items. Verify that you have received the items listed in “Standard Shipped Items” on page 6. If anything is missing or damaged, contact your nearest Agilent Sales Office. 2 Connect the power cord and turn on the power supply. The front panel display will light up briefly while the power supply performs its power- on self- test. The GPIB address is also displayed.
Getting Started Preparing the Power Supply 1 Connecting power to the power supply If the power supply does not turn on Use the following steps to help solve problems you might encounter when turning on the instrument. If you need more help, refer to Chapter 8, “Service and Maintenance” for instructions on returning the instrument to Agilent for service. 1 Verify that there is AC power to the power supply.
1 Getting Started Preparing the Power Supply Checking the output The following procedures ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and verification tests, refer to Chapter 8, “Service and Maintenance”. If an error is detected during the output checkout procedures, the ERROR annunciator will turn on. Refer to Chapter 4, “Error Messages” for more information.
Getting Started Preparing the Power Supply 1 Current output check The following steps check the basic current functions with a short across the power supply’s output. Power 1 Turn on the power supply. Make sure that the output is disabled. The OFF annunciator is turned on. 2 Connect a short across the (+) and (–) output terminals with an insulated test lead. Use a wire size sufficient to handle the maximum current. Refer to Table 1- 7 for more information. Output On/Off 3 Enable the output.
1 Getting Started Preparing the Power Supply Converting line voltage Shock Hazard Operating personnel must not remove the power supply covers. Component replacement and internal adjustments must be made only by qualified service personnel. WA R N I N G Line voltage conversion is accomplished by adjusting two components: the line voltage selection switch and the power- line fuse on the rear panel. 1 Remove the AC line power. 2 Remove the cover. Refer to “General Disassembly” on page 188.
Getting Started Preparing the Power Supply 1 Replace the power-line fuse 1 Remove the power cord, and remove the fuse- holder assembly from the rear panel with a flat- blade screwdriver. 2 Remove the fuse- holder from the assembly. 3 Replace with the correct fuse.
1 Getting Started Preparing the Power Supply 4 Replace the fuse- holder assembly in the rear panel. NOTE Verify that the correct line voltage is selected and the power-line fuse is good. Rack-mounting the power supply You can mount the power supply in a standard 19- inch rack cabinet using one of three optional kits available. Instructions and mounting hardware are included with each rack- mounting kit.
Getting Started Preparing the Power Supply 1 1 To remove the front bumper, stretch a corner and then slide it off. 2 To remove the rear bumper, pull the bumper off from the top as there are potrusions on the sides and bottom of the cover. Front Rear (bottom view) 3 To rack- mount a single instrument, order the adapter kit (5063- 9243). 4 To rack- mount two instruments of the same depth side- by- side, order the lock- link kit (5061- 9694) and rack- mount kit (5063- 9214).
1 Getting Started Preparing the Power Supply 5 To install two instruments in a sliding support shelf, order the support shelf (5063- 9256) and the slide kit (1494- 0015).
Getting Started Product at a Glance 1 Product at a Glance Front panel Figure 1-3 Front panel Table 1-4 Front panel overview No Item Description 1 Output 1 selection key Select the output 1 voltage and current to be controlled and monitored on the display. 2 Output 2 selection key Select the output 2 voltage and current to be controlled and monitored on the display.
1 Getting Started Product at a Glance Table 1-4 Front panel overview (continued) No Item Description 3 Low voltage range selection key Select the low voltage range and allow its full rated output to the output terminals. 4 High voltage range selection key Select the high voltage range and allow its full rated output to the output terminals. 5 Overvoltage protection key Enable or disable the overvoltage protection function, set the trip voltage level, and clear the overvoltage condition.
Getting Started Product at a Glance 1 Voltage and current limit settings You can set the voltage and current limit values from the front panel using the following method. 1 Or 2 Low + Or + High Figure 1-4 Voltage and current limit settings 1 Select the desired output and voltage range using the output selection keys and the voltage range selection keys after turning on the power supply. 2 Press Display Limit to show the limit values on the display.
1 Getting Started Product at a Glance Rear panel Figure 1-5 Rear panel Table 1-5 Rear panel overview 20 No Description 1 AC inlet 2 Power-line fuse-holder assembly 3 Power-line module 4 Output 1 rear output terminals 5 Output 2 rear output terminals E364xA User’s and Service Guide
Getting Started Product at a Glance 1 Table 1-5 Rear panel overview (continued) No Description 6 GPIB (IEEE-488) interface connector 7 RS-232 interface connector Display annunciators Figure 1-6 Display annunciators Table 1-6 Display annunciators overview Item Description Adrs The power supply is addressed to listen or talk over a remote interface. Rmt The power supply is in the remote interface mode. 8V[1]/35V[2] Indicate that the low voltage range is selected.
1 Getting Started Product at a Glance Table 1-6 Display annunciators overview (continued) Item Description OVP2 The output2 overvoltage protection function is enabled when the OVP2 annunciator turns on or the overvoltage protection circuit has caused the power supply to shut down when the annunciator blinks. CAL The power supply is in the calibration mode. Limit The display shows the limit values of the voltage and current.
Getting Started Output Connections 1 Output Connections Before attempting to connect wires to the rear output terminals, make sure to turn off the power supply first to avoid damage to the circuits being connected. CAUTION Front panel binding posts are available to connect load wires for bench operation and are paralleled with the rear panel (+) and (–) connections. Both the front and rear panel terminals are optimized for noise, regulation, and transient response as documented in Chapter 7.
1 Getting Started Output Connections NOTE To satisfy safety requirements, load wires must be heavy enough not to overheat when carrying the maximum short-circuit output current of the power supply. If there is more than one load, then any pair of load wires must be capable of safely carrying the full-rated current of the power supply. Voltage drops The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the wires.
Getting Started Output Connections 1 Inductive loading Inductive loads present no loop stability problems in the constant voltage mode. In the constant current mode, inductive loads form a parallel resonance with the power supply’s output capacitor. Generally this will not affect the stability of the power supply, but it may cause ringing of the current in the load. Pulse loading In some applications, the load current varies periodically from a minimum to a maximum value.
1 Getting Started Output Connections Remote voltage sensing connections Remote voltage sensing is used to maintain regulation at the load and reduce the degradation of regulation that would occur due to the voltage drop in the leads between the power supply and the load. When the power supply is connected for remote sensing, the OVP circuit senses the voltage at the sensing points (load) and not the output terminals.
Getting Started Output Connections 1 Stability Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter, which becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the power supply’s stability, resulting in poor transient response or loop instability. In severe cases, it may cause oscillations.
1 Getting Started Output Connections Output rating The rated output voltage and current specifications in Chapter 7 apply at the output terminals of the power supply. With remote sensing, any voltage dropped in the load leads must be added to the load voltage to calculate the maximum output voltage. The performance specifications are not guaranteed when the maximum output voltage is exceeded.
Getting Started Output Connections 1 Multiple loads When connecting multiple loads to the power supply, each load should be connected to the output terminals using separate connecting wires. This minimizes mutual coupling effects between loads and takes full advantage of the low output impedance of the power supply. Each pair of wires should be as short as possible and twisted or bundled to reduce lead inductance and noise pick- up.
1 Getting Started Operating the Power Supply Operating the Power Supply Cooling The power supply can operate at the rated specifications within the temperature range of 0 °C to 40 °C. A fan cools the power supply by drawing air through the sides and exhaust it out the back. Using an Agilent rack- mount will not impede the flow of air. Bench operation Your power supply must be installed in a location that allows sufficient space at the sides and rear of the power supply for adequate air circulation.
E364xA Dual Output DC Power Supplies User’s and Service Guide 2 Operation and Features Overview 32 Constant Voltage Operation 34 Constant Current Operation 36 Track Mode Operation 38 View Menu Operation 40 Configuring the Remote Interface 42 Storing and Recalling Operating States 44 Programming the Overvoltage Protection 46 Disabling the Output 50 System-Related Operations 52 GPIB Interface Reference 56 RS-232 Interface Reference 57 Calibration 61 This chapter describes the operations and features for the
2 Operation and Features Overview Overview The following section describes an overview of the front panel keys before operating your power supply. • The power supply is shipped from the factory configured in the front panel operation mode. When in this mode, the front panel keys can be used. At power- on, the power supply is automatically set to operate in the front panel operation mode and the output1 is selected for front 2 panel operation. Press for the output2 front panel operation.
Operation and Features Overview 2 • The display provides the present operating status of the power supply with annunciators and also informs you of error codes. For example, the power supply is operating in the CV mode in the 8 V/3 A range and controlled from the front panel, then the CV and 8 V annunciators will turn on.
2 Operation and Features Constant Voltage Operation Constant Voltage Operation To set up the power supply for constant voltage (CV) operation, proceed as follows. Front panel operation 1 Connect a load to the output terminals. With power- off, connect a load to the (+) and (–) output terminals. Power 2 Turn on the power supply. The power supply will go into the power- on/reset state and the output is disabled (the OFF annunciator turns on).
Operation and Features Constant Voltage Operation 1 Voltage Current 2 4 Adjust the knob for the desired current limit.[1] Check that the Limit annunciator still flashes. Set the knob for current control. The flashing digit can be changed using the resolution selection keys and the flashing digit can be adjusted by turning the knob. Adjust the knob to the desired current limit. 1 Voltage Current 5 Adjust the knob for the desired output voltage.[2] Check that the Limit annunciator still flashes.
2 Operation and Features Constant Current Operation Remote interface operation CURRent {|MIN|MAX} Set the current. VOLTage {|MIN|MAX} Set the voltage. OUTPut ON Enable the output. Constant Current Operation To set up the power supply for constant current (CC) operation, proceed as follows. Front panel operation 1 Connect a load to the output terminals. With power- off, connect a load to the (+) and (–) output terminals. Power 2 Turn on the power supply.
Operation and Features Constant Current Operation 2 In constant current mode, the current values between the meter mode and limit mode are the same, but the voltage values are not. Moreover, if the display is in the meter mode, you cannot see the change of voltage limit value when adjusting the knob. We recommend that you should set the display to the limit mode to see the change of voltage limit value in the constant current mode whenever adjusting the knob.
2 Operation and Features Track Mode Operation NOTE During actual CC operation, if a load change causes the voltage limit to be exceeded, the power supply will automatically crossover to constant voltage mode at the preset voltage limit and the output current will drop proportionately. Remote interface operation VOLTage {|MIN|MAX} Set the voltage. CURRent {|MIN|MAX} Set the current. OUTPut ON Enable the output. Track Mode Operation This power supply provides tracking outputs.
Operation and Features Track Mode Operation 2 Front panel operation 1 Set either the output1 or the output2 supply to the desired voltage. Track 2 Enable the track mode. HOLD_KEY Hold down Track until the Track annunciator turns on. For example, when the track mode is first enabled with the output1 selected, the output2 supply will be set to the same voltage level as the output1 supply.
2 Operation and Features View Menu Operation View Menu Operation From the View menu, you can read the errors, firmware revision, and calibration string. In addition, you can change the front panel display mode to V- V display, I- I display, or V- I display as desired. With this V- V or I- I display mode setting, you can see voltages or currents on the output1 and the output2, simultaneously. • After the display mode is set to V- V or I- I, you cannot change the limit values.
Operation and Features View Menu Operation 2 Viewing the errors View 1 Press View twice to view the errors. 1: ERR -103 The total number of the errors detected will be displayed shortly before the above message is displayed. The above number 1 stands for the first error in queue and the -103 is the error code. > 2 Scroll through the error numbers and view the text of the error message by using the knob and > key. Press > to increase the scrolling speed of the text on the display.
2 Operation and Features Configuring the Remote Interface Viewing the calibration string 1 Enter the View menu and select CAL STRING. View CAL STRING View 2 Scroll through the text of the message. FACTORY CAL 26/11/12 NO STRING is displayed if no calibration message is stored. Press > to increase the scrolling speed. The Cal String cannot be changed from the front panel. Refer to “Calibration message” on page 66 for more information.
Operation and Features Configuring the Remote Interface 2 GPIB configuration I/O Config 1 Turn on the remote configuration mode. GPIB / 488 If RS-232 appears, select GPIB / 488 by turning the knob. I/O Config 2 Select the GPIB address. ADDR 05 You can set the power supply’s address to any value between 0 and 30. The factory setting is address 5. I/O Config 3 Save the change and exit the menu. SAVED Your computer's GPIB interface card has its own address.
2 Operation and Features Storing and Recalling Operating States 4 Select the parity and number of stop bits. I/O Config Select one of the following: None (8 data bits, factory setting), Odd (7 data bits), or Even (7 data bits). When you set the parity, you are also indirectly setting the number of the data bits. NONE 8 BITS I/O Config 5 Save the change and exit the menu. SAVED Storing and Recalling Operating States You can store up to five different operating states in non- volatile storage locations.
Operation and Features Storing and Recalling Operating States Store 2 2 Turn on the storage mode. STORE STATE From the front panel, you can assign names (up to nine characters) to each of the five stored states. Turn the knob until NAME STATE appears and press Store to select the locations. Then press Store to name the locations. NAME STATE 1:P15V_TEST 3 Select the storage location. Store Turn the knob to the right to specify the memory location 2. 2: STATE2 Store 4 Save the operating state.
2 Operation and Features Programming the Overvoltage Protection Remote interface operation Use the following commands to store and recall the power supply state. *SAV {1|2|3|4|5} Store an operating state to a specified location. *RCL {1|2|3|4|5} Recall a previously stored state from a specified location. “MEM:STAT:NAME 1, ‘P15V_TEST’” Name the storage location 1 as “P15V_TEST”.
Operation and Features Programming the Overvoltage Protection 2 3 Enter the OVP menu and set the desired trip level. Over Voltage LEVEL 22.0 V (E3646A) Use the knob and the resolution selection key < or > to set the desired trip level. Note that you cannot set the trip levels to lower than 1.0 V. Over Voltage 4 Enable the OVP circuit. OVP ON Over Voltage 5 Exit the OVP menu. CHANGED If the OVP settings are not changed, NO CHANGE will be displayed.
2 Operation and Features Programming the Overvoltage Protection • By adjusting the output voltage level Display Limit i Lower the output voltage level below the OVP trip point. The OVP1 or OVP2, and Limit annunciators are flashing after Display is pressed. Limit Over Voltage ii Check that you lowered the voltage level below the OVP trip point. The OVP trip point is displayed. Do not adjust the trip point at this step. Over Voltage iii Select the OVP CLEAR mode by turning the knob.
Operation and Features Programming the Overvoltage Protection 2 Remote interface operation VOLT:PROT {|MIN|MAX} Set the OVP level. VOLT:PROT:STAT {OFF|ON) Disable or enable the OVP circuit. VOLT:PROT:CLE Clear the tripped OVP circuit. NOTE The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the output of the power supply whenever the overvoltage condition occurs.
2 Operation and Features Disabling the Output Disabling the Output The output of the power supply can be disabled or enabled from the front panel. • When the power supply is in the Off state, the OFF annunciator turns on and the output is disabled. The OFF annunciator turns off when the power supply returns to the On state. When the output is disabled, the voltage value is 0 V and the current value is 0.02 A. This gives a zero output voltage without actually disconnecting the output.
Operation and Features Disabling the Output 2 Disconnecting the output using an external relay To disconnect the output, an external relay must be connected between the output and the load. A TTL signal of either low true or high true is provided to control an external relay. This signal can only be controlled with the remote command OUTPut:RELay {OFF|ON}. The TTL output is available on the RS- 232 connection pin 1 and pin 9. When the OUTPut:RELay state is “ON”, the TTL output of pin 1 is high (4.
2 Operation and Features System-Related Operations System-Related Operations This section gives information on system- related topics such as storing power supply states, reading errors, running a self- test, displaying messages on the front panel, and reading firmware revisions. State storage The power supply has five storage locations in non- volatile memory to store power supply states. The locations are numbered 1 through 5. You can assign a name to each of the locations for use from the front panel.
Operation and Features System-Related Operations 2 Front panel operation Store STORE STATE, NAME STATE, EXIT To reset the power supply to the power- on reset state without using the *RST command or turning power off/on, select RESET from the following. Recall 5 states, RESET, EXIT Remote interface operation Use the following commands to store and recall power supply states.
2 Operation and Features System-Related Operations If the complete self- test is successful, PASS is displayed on the front panel. If the self- test fails, FAIL is displayed and the ERROR annunciator turns on. Refer to Chapter 8, “Service and Maintenance” for instructions on returning the power supply to Agilent for service. Front panel operation To perform the complete front panel self- test, hold down Display as you turn on the power supply and hold down the Limit key until you hear a long beep.
Operation and Features System-Related Operations 2 Front panel operation View View REV X.X-Y.Y-Z.Z Press View and turn the knob until FW REVISION appears and then press View to read the system firmware revision numbers. Remote interface operation *IDN? The above command returns a string in the form: Agilent Technologies,E3646A,0,X.X-Y.Y-Z.Z (E3646A) Be sure to dimension a string variable with at least 40 characters.
2 Operation and Features GPIB Interface Reference GPIB Interface Reference The GPIB connector on the rear panel connects your power supply to the computer and other GPIB devices. Chapter 1, “Accessories” lists the cables that are available from Agilent. A GPIB system can be connected together in any configuration (star, linear, or both) as long as the following rules are observed: Each device on the GPIB (IEEE- 488) interface must have a unique address.
Operation and Features RS-232 Interface Reference 2 RS-232 Interface Reference The power supply can be connected to the RS- 232 interface using the 9- pin (DB- 9) serial connector on the rear panel. The power supply is configured as a Data Terminal Equipment (DTE) device. For all communications over the RS- 232 interface, the power supply uses two handshake lines: Data Terminal Ready (DTR, on pin 4) and Data Set Ready (DSR, on pin 6).
2 Operation and Features RS-232 Interface Reference RS-232 data frame format A character frame consists of all the transmitted bits that make up a single character. The frame is defined as the characters from the start bit to the last stop bit, inclusively. Within the frame, you can select the baud rate, number of data bits, and parity type. The power supply uses the following frame formats for seven and eight data bits.
Operation and Features RS-232 Interface Reference 2 The cable and adapter diagrams as shown in Figure 2- 2 and Figure 2- 3 can be used to connect the power supply to most computers or terminals. DB-9 serial connection If your computer or terminal has a 9- pin serial port with a male connector, use the null- modem cable included with the Agilent 34398A Cable Kit. This cable has a 9- pin female connector on each end. The cable pin diagram is as shown in Figure 2- 2.
2 Operation and Features RS-232 Interface Reference DCD RX TX DTR GND DSR RTS CTS RI DB9 Male 5181-6641 Adapter 5182-4794 Cable Instrument 1 2 3 4 5 6 7 8 9 DB9 Female 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 DB9 DB9 Female Male PC 2 3 4 5 6 7 8 20 TX RX RTS CTS DSR GND DCD DTR DB25 DB25 Female Male Figure 2-3 DB-25 serial connection RS-232 troubleshooting Here are a few things to check if you are having problems communicating over the RS- 232 interface.
Operation and Features Calibration 2 Calibration This section gives an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, refer to Chapter 8, “Service and Maintenance”. Calibration security This feature allows you to enter a security code to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured.
2 Operation and Features Calibration Table 2-1 Factory-setting security codes Model Security code E3646A 003646 E3647A 003647 E3648A 003648 E3649A 003649 To unsecure for calibration You can unsecure the power supply either from the front panel or over the remote interface. The power supply is secured when shipped from the factory. Refer to Table 2- 1 for the factory- setting secure code for your power supply. Front panel operation Power View Calibrate 1 Select the calibration mode.
Operation and Features Calibration 2 Notice that if you enter the wrong security code, INVALID is displayed and the code entering mode is displayed for you to enter the correct code. Remote interface operation CAL:SEC:STAT {OFF|ON}, Secure or unsecure the power supply. To unsecure the power supply, send the above command with the same code used to secure.
2 Operation and Features Calibration I/O Config Secure Power 3 Save the change and exit the menu. SECURED The secured setting is stored in non- volatile memory, and does not change when power has been turned off or after a power- on reset (*RST command). Remote interface operation CAL:SEC:STAT {OFF|ON}, Secure or unsecure the power supply. To secure the power supply, send the above command with the same code as used to unsecure.
Operation and Features Calibration 2 Remote interface operation CAL:SEC:CODE Change the security code. To change the security code, first unsecure the power supply using the old security code. Then, enter the new code as shown below. CAL:SEC:STAT OFF, ‘003646’ Unsecure with the old code. CAL:SEC:CODE ‘ZZ001443’ Enter the new code. CAL:SEC:STAT ON, ‘ZZ001443’ Secure with the new code. Calibration count You can determine the number of times that your power supply has been calibrated.
2 Operation and Features Calibration Calibration message The power supply allows you to store one message in calibration memory in the mainframe. For example, you can store such information as the date when the last calibration was performed, the date when the next calibration is due, the power supply’s serial number, or even the name and phone number of the person to contact for a new calibration.
E364xA Dual Output DC Power Supplies User’s and Service Guide 3 Remote Interface Reference SCPI Command Summary 68 Introduction to the SCPI Language 74 Simplified Programming Overview 80 Using the APPLy Command 83 Output Settings and Operation Commands 84 Triggering Commands 92 System-Related Commands 95 State Storage Commands 99 Calibration Commands 101 Interface Configuration Commands 106 SCPI Status Registers 107 Status Reporting Commands 119 Halting an Output in Progress 124 SCPI Conformance Informatio
3 Remote Interface Reference SCPI Command Summary SCPI Command Summary NOTE If you are a first-time user of the SCPI language, refer to “Introduction to the SCPI Language” and “Simplified Programming Overview” to familiarize with the SCPI language before attempting to program the power supply. This section summarizes the Standard Commands for Programmable Instruments (SCPI) available to program the power supply over the remote interface.
Remote Interface Reference SCPI Command Summary 3 Table 3-1 SCPI command summary Output Settings and Operation Commands APPLy {|DEF|MIN|MAX}[,{|DEF|MIN|MAX}] APPLy? [SOURce:] CURRent[:LEVel][:IMMediate][:AMPLitude] {|MIN|MAX|UP|DOWN} CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] CURRent[:LEVel][:IMMediate]:STEP[:INCRement] {|DEFault} CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? [DEFault] CURRent[:LEVel]:TRIGgered[:AMPLitude] {|MIN|MAX} CURRent[:LEVe
3 Remote Interface Reference SCPI Command Summary Table 3-1 SCPI command summary (continued) Triggering Commands INITiate[:IMMediate] TRIGger[:SEQuence] :DELay {|MIN|MAX} :DELay? [MIN|MAX] :SOURce {BUS|IMM} :SOURce? *TRG System-Related Commands DISPlay[:WINDow] [:STATe] {OFF|ON} [:STATe]? :MODE {VV|VI|II} :MODE? :TEXT[:DATA] :TEXT[:DATA]? :TEXT:CLEar SYSTem :BEEPer[:IMMediate] :ERRor? :VERSion? OUTPut :RELay[:STATe] {OFF|ON} :RELay[:STATe]? [:STATe] {OFF|ON} [:STATe]? *IDN? *RST
Remote Interface Reference SCPI Command Summary 3 Table 3-1 SCPI command summary (continued) Calibration Commands CALibration :COUNt? :CURRent[:DATA] :CURRent:LEVel {MIN|MID|MAX} :SECure:CODE :SECure:STATe {OFF|ON}, :SECure:STATe? :STRing :STRing? :VOLTage[:DATA] :VOLTage:LEVel {MIN|MID|MAX} :VOLTage:PROTection Interface Configuration Commands SYSTem :INTerface {GPIB|RS232} :LOCal :REMote :RWLock E364xA User’s and Service Guide 71
3 Remote Interface Reference SCPI Command Summary Table 3-1 SCPI command summary (continued) Status Reporting Commands STATus:QUEStionable [:EVENt]? :ENABle :ENABle? :INSTrument [:EVENt]? :ENABle :ENABle? :ISUMmary [:EVENt]? :CONDition? :ENABle :ENABle? SYSTem:ERRor? *CLS *ESE *ESE? *ESR? *OPC *OPC? *PSC {0|1} *PSC? *SRE *SRE? *STB? *WAI 72 E364xA User’s and Service Guide
Remote Interface Reference SCPI Command Summary 3 Table 3-1 SCPI command summary (continued) IEEE-488 Conformance Information *CLS *ESR? *ESE *ESE? *IDN? *OPC *OPC? *PSC {0|1} *PSC? *RST *SAV {1|2|3|4|5} *RCL {1|2|3|4|5} *STB? *SRE *SRE? *TRG *TST? *WAI [1] Applicable for E3646A and E3648A only. [2] Applicable for E3647A and E3649A only.
3 Remote Interface Reference Introduction to the SCPI Language Introduction to the SCPI Language Standard Commands for Programmable Instruments (SCPI) is an ASCII- based instrument command language designed for test and measurement instruments. Refer to “Simplified Programming Overview” for an introduction to the basic techniques used to program the power supply over the remote interface. SCPI commands are based on a hierarchical structure, also known as a tree system.
Remote Interface Reference Introduction to the SCPI Language 3 Command format used in this manual The format used to show commands in this manual is shown below: CURRent {|MINimum|MAXimum|UP|DOWN} The command syntax shows most commands (and some parameters) as a mixture of upper- case and lower- case letters. The upper- case letters indicate the abbreviated spelling for the command. For shorter program lines, send the abbreviated form. For better program readability, send the long form.
3 Remote Interface Reference Introduction to the SCPI Language Some portions of commands are enclosed in square brackets ([]). The brackets indicate that this portion of the command is optional. Most optional portions of the command are not shown in the command description. For the full command showing all the options, refer to Table 3- 1. A colon (:) separates a command keyword from a lower- level keyword. You must insert a blank space to separate a parameter from a command keyword.
Remote Interface Reference Introduction to the SCPI Language 3 Using the MIN and MAX parameters You can substitute MINimum or MAXimum in place of a parameter for many commands. For example, consider the following command: CURRent {|MIN|MAX} Instead of selecting a specific current, you can substitute MINimum to set the current to its minimum value or MAXimum to set the current to its maximum value.
3 Remote Interface Reference Introduction to the SCPI Language SCPI command terminators A command string sent to the power supply must terminate with a character. The IEEE- 488 EOI (end- or- identify) message is interpreted as a character and can be used to terminate a command string in place of a character. A followed by a is also accepted. Command string termination will always reset the current SCPI command path to the root level.
Remote Interface Reference Introduction to the SCPI Language 3 You can also send engineering unit suffixes (V, A, or SEC) with numeric parameters. If only specific numeric values are accepted, the power supply will automatically round the input numeric parameters. The following command uses a numeric parameter: CURR {|MIN|MAX|UP|DOWN} Discrete parameters Discrete parameters are used to program settings that have a limited number of values such as BUS and IMM.
3 Remote Interface Reference Simplified Programming Overview Simplified Programming Overview This section gives an overview of the basic techniques used to program the power supply over the remote interface. This section is only an overview and does not give all of the details you will need to write your own application programs. Refer to the remainder of this chapter and also Chapter 5, “Application Programs” for more details and examples.
Remote Interface Reference Simplified Programming Overview 3 Reading a query response Only the query commands (commands that end with “?”) will instruct the power supply to send a response message. Queries return either output values or internal instrument settings. For example, the following statements executed from your computer will read the power supply’s error queue and print the most recent error: dimension statement Dimension string array (80 elements). SYST:ERR? Read the error queue.
3 Remote Interface Reference Simplified Programming Overview Power supply programming ranges The SOURce subsystem requires parameters for programming values. The available programming value for a parameter varies according to the desired output range of the power supply. Table 3- 2 lists the programming values available and the MINimum, MAXimum, DEFault, and reset values of your power supply. Refer to Table 3- 2 to identify the programming values when programming the power supply.
Remote Interface Reference Using the APPLy Command 3 Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface. You can select the output voltage and current in one command. APPLy {| DEF | MIN | MAX}[,{| DEF | MIN | MAX}] This command is a combination of VOLTage and CURRent commands.
3 Remote Interface Reference Output Settings and Operation Commands Output Settings and Operation Commands This section describes low- level commands used to program the power supply. Although the APPLy command provides the most straightforward method to program the power supply, the low- level output setting commands give you more flexibility to change the individual parameters. CURRent {|MINimum|MAXimum|UP|DOWN} This command programs the immediate current level of the power supply.
Remote Interface Reference Output Settings and Operation Commands 3 To set the step size to the minimum resolution, set the step size to DEFault. The minimum resolution of the step size is approximately 0.052 mA (E3646A), 0.014 mA (E3647A), 0.095 mA (E3648A), and 0.027 mA (E3649A), respectively. The CURR:STEP? DEF returns the minimum resolution of your instrument. The immediate current level increases or decreases by the value of the step size.
3 Remote Interface Reference Output Settings and Operation Commands CURR:STEP 0.02 Set the step size to 0.02 A. CURR DOWN Decrease the output current. INSTrument[:SELect] {OUTPut1|OUTPut2|OUT1|OUT2} This command selects the output to be programmed by the output identifier. The outputs of the power supply are considered as two logical instruments. The INSTrument command provides a mechanism to identify and select an output.
Remote Interface Reference Output Settings and Operation Commands 3 INSTrument:COUPle[:TRIGger] {ON|OFF} Enable or disable a coupling between two logical outputs of the power supply. The couple command consists of an optional subsystem node followed by a signal parameter. The only valid parameter for the optional subsystem node is the TRIGger subsystem. If no node follows the couple command, TRIGger subsystem is assumed to be coupled.
3 Remote Interface Reference Output Settings and Operation Commands MEASure:CURRent? Query the current measured across the current sense resistor inside the power supply. MEASure[:VOLTage]? Query the voltage measured at the sense terminals of the power supply. OUTPut:TRACk[:STATe] {ON|OFF} This command enables or disables the power supply to operate in the track mode. See “Track Mode Operation” on page 38 for more information on tracking operation. At *RST, the track mode is disabled.
Remote Interface Reference Output Settings and Operation Commands 3 VOLTage:STEP {|DEFault} Set the step size for voltage programming with the VOLT UP and VOLT DOWN commands. See the example below. To set the step size to the minimum resolution, set the step size to DEFault. The minimum resolution of the step size is approximately 0.35 mV (E3646A), 1.14 mV (E3647A), 0.38 mV (E3648A), and 1.14 mV (E3649A), respectively.
3 Remote Interface Reference Output Settings and Operation Commands VOLTage:TRIGgered? [MINimum|MAXimum] Query the triggered voltage level presently programmed. If no triggered level is programmed, the VOLT level is returned. VOLTage:PROTection {|MINimum|MAXimum} Set the voltage level at which the overvoltage protection (OVP) circuit will trip. If the peak output voltage exceeds the OVP level, then the power supply output is shorted by an internal SCR.
Remote Interface Reference Output Settings and Operation Commands 3 VOLTage:PROTection:CLEar Cause the overvoltage protection circuit to be cleared. After this command, the output voltage is restored to the state it was in before the protection feature occurred and the OVP trip level remains unchanged to the value presently programmed. Before sending this command, lower the output voltage below the OVP trip point, or raise the OVP trip level above the output setting.
3 Remote Interface Reference Triggering Commands Triggering Commands The power supply’s triggering system allows a change in voltage and current when receiving a trigger, to select a trigger source, and to insert a trigger. Triggering the power supply is a multi- step process. 1 First, you must specify the source from which the power supply will accept the trigger. The power supply will accept a bus (software) trigger or an immediate trigger from the remote interface.
Remote Interface Reference Triggering Commands 3 • To trigger the power supply from the remote interface (GPIB or RS- 232) after selecting the bus source, send the *TRG (trigger) command. When the *TRG command is sent, the trigger action starts after the specified time delay if any delay is given. • You can also trigger the power supply from the GPIB interface by sending the IEEE- 488 Group Execute Trigger (GET) message. The following statement shows how to send a GET from a Hewlett- Packard controller.
3 Remote Interface Reference Triggering Commands Triggering commands INITiate Cause the trigger system to initiate. This command completes one full trigger cycle when the trigger source is an immediate and initiates the trigger subsystem when the trigger source is bus. TRIGger:DELay {|MINimum|MAXimum} Set the time delay between the detection of an event on the specified trigger source and the start of any corresponding trigger action on the power supply output. Select from 0 to 3600 seconds.
Remote Interface Reference System-Related Commands 3 System-Related Commands DISPlay {OFF|ON} Turn the front panel display off or on. When the display is turned off, outputs are not sent to the display and all annunciators are disabled except the ERROR annunciator. The display state is automatically turned on when you Store return to the local mode. Press the Local (Local) key to return to the local state from the remote interface.
3 Remote Interface Reference System-Related Commands DISPlay:TEXT? Query the message sent to the front panel and returns a quoted string. DISPlay:TEXT:CLEar Clear the message displayed on the front panel. OUTPut {OFF|ON} Enable or disable the outputs of the power supply. When the output is disabled, the voltage value is 0 V and the current value is 0.02 mA. At *RST, the output state is OFF. OUTPut? Query the output state of the power supply. The returned value is 0 (OFF) or 1 (ON).
Remote Interface Reference System-Related Commands 3 SYSTem:ERRor? Query the power supply’s error queue. A record of up to 20 errors are stored in the power supply’s error queue. Errors are retrieved in the first- in- first- out (FIFO) order. The first error returned is the first error that was stored. When you have read all errors from the queue, the ERROR annunciator turns off and the errors are cleared. See Chapter 4, “Error Messages” for more details.
3 Remote Interface Reference System-Related Commands *RST Reset the power supply to its power- on state. Table 3- 3 shows the state of the power supply after a RESET from the Recall menu or *RST command from the remote interface. Table 3-3 Power supply state[1] Command E3646A state E3647A state E3648A state E3649A state CURR 3A 0.8 A 5A 1.4 A CURR:STEP 0.052 mA 0.014 mA 0.095 mA 0.027 mA CURR:TRIG 3A 0.8 A 5A 1.
Remote Interface Reference State Storage Commands 3 State Storage Commands The power supply has five storage locations in non- volatile memory to store power supply states. The locations are numbered 1 through 5. You can also assign a name to each of the locations (1 through 5) for use from the front panel. *SAV {1|2|3|4|5} Store (Save) the present state of the power supply to the specified location. Any state previously stored in the same location is overwritten (no error is generated).
3 Remote Interface Reference State Storage Commands MEMory:STATe:NAME {1|2|3|4|5}, MEMory:STATe:NAME? {1|2|3|4|5} Assign a name to the specified storage location. From the remote interface, you can only recall a stored state using a number (1 through 5). The :NAME? query returns a quoted string containing the name currently assigned to the specified storage location. If the specified location has no name assigned, an empty string (“ ”) is returned. The name can contain up to nine characters.
Remote Interface Reference Calibration Commands 3 Calibration Commands Refer to “Calibration” on page 61 for an overview of the calibration features of the power supply. An example program for calibration is listed in “Calibration example” on page 104. For more detailed discussion on the calibration procedures, refer to the “Service and Maintenance” on page 177. NOTE When you calibrate the power supply, you should not set the OVP to the ON state in order to prevent OVP from tripping.
3 Remote Interface Reference Calibration Commands CALibration:CURRent:LEVel {MINimum|MIDdle|MAXimum} This command can only be used after calibration is unsecured and the output state is ON. It sets the power supply to a calibration point that is entered with the CAL:CURR command. During calibration, three points must be entered and the low- end point (MIN) must be selected and entered first. CALibration:SECure:CODE Enter a new security code.
Remote Interface Reference Calibration Commands 3 CALibration:VOLTage[:DATA] This command can only be used after calibration is unsecured and the output state is ON. It enters a voltage value that you obtained by reading an external meter. You must first select the minimum calibration level (CAL:VOLT:LEV MIN) for the value being entered. You must then select the middle and maximum calibration levels (CAL:VOLT:LEV MID and CAL:VOLT:LEV MAX) for the value being entered.
3 Remote Interface Reference Calibration Commands Calibration example 1 Select the output to be calibrated and enable the output of the power supply by sending the commands: INST:SEL {OUT1|OUT2} OUTP ON 2 Disable the voltage protection function. VOLT:PROT:STAT OFF 3 Unsecure the power supply with the security code before calibration. CAL:SEC:STAT OFF, ‘’ 4 For voltage calibration, connect a digital voltmeter (DVM) across the power supply’s output terminals.
Remote Interface Reference Calibration Commands 3 13 Repeat step 5 through step 9 by substituting CURR for VOLT for current calibration. For example, CAL:CURR:LEV MIN 14 Repeat step 1 through step 13 for the other output calibration. 15 Record calibration information such as next calibration due date or contact person for future reference. The calibration string may contain up to 40 characters.
3 Remote Interface Reference Interface Configuration Commands Interface Configuration Commands Refer to also “Configuring the Remote Interface” on page 42 for more information. SYSTem:INTerface {GPIB|RS232} Select the remote interface. Only one interface can be enabled at a time. The GPIB interface is selected when the power supply is shipped from the factory. SYSTem:LOCal Place the power supply in the local mode during RS- 232 operation. All keys on the front panel are fully functional.
Remote Interface Reference SCPI Status Registers 3 SCPI Status Registers All SCPI instruments implement status registers in the same way. The status system records various instrument conditions in three register groups: the Status Byte register, the Standard Event register, and the Questionable Status register groups. The Status Byte register records high- level summary information reported in the other register groups.
3 Remote Interface Reference SCPI Status Registers What is a multiple logical output? The two- logical outputs of the power supply include an INSTrument summary status register and an individual instrument ISUMmary register for each logical output. The ISUMmary registers report to the INSTrument register, which in turn reports to bit 13 of the Questionable Status register. This is shown pictorially on Figure 3- 1.
Remote Interface Reference SCPI Status Registers 3 SCPI status system QUEStionable Status Event Register Enable Registers Not Used Not Used Not Used Not Used Temperature 4 Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used 13 ISUM Not Used Not Used STAT:QUES? Output Buffer "OR" + Status Byte Summary Register STAT:QUES:ENAB STAT:QUES:ENAB? Operation Complete Query Error Device Dependent Error Execution Error Command Error Power On OPC Not Used QYE DDE EXE CME Not Used
3 Remote Interface Reference SCPI Status Registers Questionable Status register The Questionable Status register provides information about unexpected operations of the power supply. Bit 4 reports a fault with the fan, and bit 13 summarizes questionable outputs for any of the two supplies. For example, if one of the two supplies is in constant voltage mode and due to an overload looses regulation, bit 13 is set (latched). To read the register, send the command STATus:QUEStionable?.
Remote Interface Reference SCPI Status Registers 3 Questionable instrument status register The questionable instrument register provides information about unexpected operations for each of the two supplies. For example, if the output1 supply is in the constant voltage mode and loses regulation, then bit 1 is set indicating a possible overload in the output1 supply. The output2 supply is reported as bit 2. Send the command STAT:QUES:INST? to read the register.
3 Remote Interface Reference SCPI Status Registers For example, 16 is returned when you have queried the status of the questionable event register, the temperature condition is questionable. The Questionable Status Enable register is cleared when you execute the STAT:QUES:ENAB 0 command.
Remote Interface Reference SCPI Status Registers 3 Table 3-5 Bit definitions — Standard Event register (continued) Bit Decimal value Definition 4 EXE 16 Execution error. An execution error occurred (refer to error messages -211 to -223 in “Execution Error Messages” on page 134). 5 CME 32 Commanderror. A command syntax error occurred (refer to error messages -104 to -178 in “Execution Error Messages” on page 134). 6 Not Used 0 Always set to 0. 7 PON 128 Power on.
3 Remote Interface Reference SCPI Status Registers Status byte register The Status Byte summary register reports conditions from the other status registers. Query data that is waiting in the power supply’s output buffer is immediately reported through the “Message Available” bit (bit 4) of the Status Byte register. Bits in the summary register are not latched. Clearing an event register will clear the corresponding bits in the Status Byte summary register.
Remote Interface Reference SCPI Status Registers 3 The Status Byte enable register (request service) is cleared when: • you execute the *SRE 0 command. • you turn on the power and have previously configured the power supply using the *PSC 1 command. The enable register will not be cleared at power- on if you have previously configured the power supply using *PSC 0.
3 Remote Interface Reference SCPI Status Registers CAUTION The IEEE-488 standard does not ensure synchronization between your bus controller program and the instrument. Use the *OPC? command to guarantee that commands previously sent to the instrument have completed. Executing a serial poll before a *RST, *CLS, or other commands have completed can cause previous conditions to be reported.
Remote Interface Reference SCPI Status Registers 3 Using SRQ to interrupt the bus controller 1 Send a device clear message to clear the power supply’s output buffer (for example, CLEAR 705). 2 Clear the event registers with the *CLS (clear status) command. 3 Set up the enable register masks. Execute the *ESE command to set up the Standard Event register and the *SRE command for the Status Byte. 4 Send the *OPC? (operation complete query) command and enter the result to ensure synchronization.
3 Remote Interface Reference SCPI Status Registers Using *OPC to signal when data is in the output buffer Generally, it is best to use the “Operation Complete” bit (bit 0) in the Standard Event register to signal when a command sequence is completed. This bit is set in the register after an *OPC command has been executed.
Remote Interface Reference Status Reporting Commands 3 Status Reporting Commands NOTE Refer to “SCPI status system” on page 109 for detailed information of the status register structure of the power supply. SYSTem:ERRor? Query the power supply’s error queue. A record of up to 20 errors is stored in the power supply’s error queue. Errors are retrieved in the first- in- first- out (FIFO) order. The first error returned is the first error that was stored.
3 Remote Interface Reference Status Reporting Commands STATus:QUEStionable:INSTrument:ENABle Set the value of the questionable instrument enable register. This register is a mask for enabling specific bits from the questionable instrument event register to set the instrument summary bit (ISUM, bit 13) of the Questionable Status register.
Remote Interface Reference Status Reporting Commands 3 STATus:QUEStionable:INSTrument:ISUMmary: ENABle Set the value of the questionable instrument Isummary enable register for a specific output of the two- output power supply. The particular output must be specified by a numeric value. n is 1 or 2. 1 selects output1, and 2 selects output2.
3 Remote Interface Reference Status Reporting Commands *OPC Set the “Operation Complete” bit (bit 0) of the Standard Event register after the command is executed. *OPC? Return 1 to the output buffer after the command is executed. *PSC {0|1} (Power- on status clear.) This command clears the Status Byte and the Standard Event register enable masks when power is turned on (*PSC 1). When *PSC 0 is in effect, the Status Byte and Standard Event register enable masks are not cleared when power is turned on.
Remote Interface Reference Status Reporting Commands 3 *WAI Instruct the power supply to wait for all pending operations to complete before executing any additional commands over the interface. Used only in the triggered mode.
3 Remote Interface Reference Halting an Output in Progress Halting an Output in Progress You can send a device clear at any time to stop an output in progress over the GPIB interface. The status registers, the error queue, and all configuration states are left unchanged when a device clear message is received. Device clear performs the following actions. • The power supply’s input and output buffers are cleared. • The power supply is prepared to accept a new command string.
Remote Interface Reference SCPI Conformance Information 3 SCPI Conformance Information The power supply conforms to the 1996.0 version of the SCPI standard. Many of the commands required by the standard are accepted by the power supply but are not described in this manual for simplicity or clarity. Most of these non- documented commands duplicate the functionality of a command already described in this manual.
3 Remote Interface Reference SCPI Conformance Information Table 3-7 SCPI confirmed commands (continued) [SOURce] :CURRent[:LEVel][:IMMediate][:AMPLitude] {|MIN|MAX|UP|DOWN} :CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] :CURRent[:LEVel][:IMMediate]:STEP[:INCRement] {|DEFault} :CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault} :CURRent[:LEVel]:TRIGgered[:AMPLitude] {|MIN|MAX} :CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX] :VOLTage[:LEVel][:IMMediate][:AMPLitud
Remote Interface Reference SCPI Conformance Information 3 Device-specific commands The following commands are device- specific to your power supply. They are not included in the 1997.0 version of the SCPI standard. However, these commands are designed with the SCPI standard in mind, and they follow all of the command syntax rules defined by the standard.
3 Remote Interface Reference IEEE-488 Conformance Information IEEE-488 Conformance Information Dedicated hardware lines ATN Attention IFC Interface Clear REN Remote Enable SRQ Service Request Enable Addressed commands 128 DCL Device Clear EOI End or Identify GET Group Execute Trigger GTL Go to Local LLO Local Lockout SDC Selected Device Clear SPD Serial Poll Disable SPE Serial Poll Enable E364xA User’s and Service Guide
Remote Interface Reference IEEE-488 Conformance Information 3 IEEE-488.
3 Remote Interface Reference IEEE-488 Conformance Information THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
E364xA Dual Output DC Power Supplies User’s and Service Guide 4 Error Messages Overview 132 Execution Error Messages 134 Self-Test Error Messages 139 Calibration Error Messages 141 This chapter lists the error messages that may appear as you are working with the power supply.
4 Error Messages Overview Overview Errors are retrieved in the first- in- first- out (FIFO) order. The first error returned is the first error that was stored. Errors are cleared as you read them. When you have read all errors from the queue, the ERROR annunciator turns off and the errors are cleared. The power supply beeps once each time an error is generated. If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with - 350, “Queue overflow”.
Error Messages Overview 4 Remote interface operation SYSTem:ERRor? Read and clear one error from the error queue. Errors have the following format (the error string may contain up to 80 characters).
4 Error Messages Execution Error Messages Execution Error Messages Table 4-1 Execution error messages -101 Invalid character An invalid character was found in the command string. You may have inserted a character such as #, $, or % in the command keyword or within a parameter. Example: OUTP:STAT #ON -102 Syntax error Invalid syntax was found in the command string. You may have inserted a blank space before or after a colon in the command header, or before a comma.
Error Messages Execution Error Messages 4 Table 4-1 Execution error messages (continued) -113 Undefined header A command was received that is not valid for this power supply. You may have misspelled the command or it may not be a valid command. If you are using the short form of the command, remember that it may contain up to four letters. Example: TRIGG:DEL 3 -114[1] Header suffix out of range The numeric suffix attached to a command header is not one of the allowable values.
4 Error Messages Execution Error Messages Table 4-1 Execution error messages (continued) -138 Suffix not allowed A suffix was received following a numeric parameter which does not accept a suffix. Example: STAT:QUES:ENAB 18 SEC (SEC is not a valid suffix.) -141 Invalid character data Either the character data element contained an invalid character or the particular element received was not valid for the header. -144 Character data too long The character data element contained too many characters.
Error Messages Execution Error Messages 4 Table 4-1 Execution error messages (continued) -221 Settings conflict Indicates that a legal program data element was parsed but could not be executed due to the current device state. -222 Data out of range A numeric parameter value is outside the valid range for the command. Example: TRIG:DEL -3 -223 Too much data A character string was received but could not be executed because the string length was more than 40 characters.
4 Error Messages Execution Error Messages Table 4-1 Execution error messages (continued) -440 Query UNTERMINATED after indefinite response The *IDN? command must be the last query command within a command string. Example: *IDN?;:SYST:VERS? 501 Isolator UART framing error 502 Isolator UART overrun error 503[1] SPI data error Data error was detected during the communication between the main controller U10 and the I/O controller U752.
Error Messages Self-Test Error Messages 4 Self-Test Error Messages Table 4-2 Self-test error messages 601 Front panel does not respond The main controller U17 (U10 for serial MY53xx6xxx) attempts to establish serial communications with the front panel controller U1 (U602 for serial MY53xx6xxx) on the front panel board. During this test, the U1 (U602 for serial MY53xx6xxx) turns on all display segments. Communication must function in both directions for this test to pass.
4 Error Messages Self-Test Error Messages Table 4-2 Self-test error messages (continued) 609[1] System ADC test failed This test checks if the ADC hardware is functional. The main controller U10 establishes communication with the ADC and checks if there are any error bits set for the ADC's status reporting. 624 Unable to sense line frequency This test checks that the LSENSE logic input U17 is toggling.
Error Messages Calibration Error Messages 4 Calibration Error Messages Table 4-3 Calibration error messages 701 Cal security disabled by jumper The calibration security feature has been disabled with a jumper inside the power supply. When applicable, this error will occur at power-on to warn you that the power supply is unsecured. 702 Cal secured The power supply is secured against calibration.
4 Error Messages Calibration Error Messages Table 4-3 Calibration error messages (continued) 717 Cal OVP status enabled Overvoltage protection status is enabled. You must set overvoltage to OFF before and during the calibration. 718 Gain out of range for Gain Error Correction The slope of the DAC gain is out of range. Hardware fails.
E364xA Dual Output DC Power Supplies User’s and Service Guide 5 Application Programs Overview 144 Example Program for C and C++ 145 Example Program for Excel 97 149 This chapter contains two application programs that utilize the remote interface.
5 Application Programs Overview Overview The application programs in this chapter help you to develop programs for your own application. Chapter 3, “Remote Interface Reference” lists the syntax for the SCPI commands available to program the power supply. The examples in this chapter have been tested on a PC running Windows 3.1, Windows 95, or Windows NT 4.0. The examples are written for use over the GPIB (IEEE- 488) or RS- 232 interface.
Application Programs Example Program for C and C++ 5 Example Program for C and C++ The following C programming example shows you how to send and receive formatted I/O. This programming example shows you how to use SCPI commands for the instrument with VISA functionality and also includes error trapping. For more information on non- formatted I/O and error trapping, refer to the Agilent VISA User’s Guide. The following C programming example was written in Microsoft Visual C++ version 1.
5 Application Programs Example Program for C and C++ void OpenPort(); void main() { double char double voltage; Buffer[256]; current; /* Value of voltage sent to power supply /* String returned from power supply /* Value of current output of power supply */ */ */ OpenPort(); /* Query the power supply id, read response and print it */ sprintf(Buffer,"*IDN?"); SendSCPI(Buffer); printf("Instrument identification string:\n %s\n\n",Buffer); SendSCPI("*RST"); SendSCPI("Current 2"); SendSCPI("Output on");
Application Programs Example Program for C and C++ void OpenPort() { char GPIB_Address[3]; char COM_Address[2]; char VISA_address[40]; if(bGPIB) strcpy(GPIB_Address,"5"); else strcpy(COM_Address,"1"); /* Complete VISA address sent to card 5 */ /* Select GPIB address between 0 to 30*/ /* Set the number to 2 for COM2 port */ if(bGPIB){ /* For use with GPIB 7 address, use "GPIB::7::INSTR" address format */ strcpy(VISA_address,"GPIB::"); strcat(VISA_address,GPIB_Address); strcat(VISA_address,"::INSTR"); }
5 Application Programs Example Program for C and C++ strcpy(pString,ReadBuffer); } } void ClosePort() { /* Close the communication port */ viClose(power_supply); viClose(defaultRM); } void CheckError(char* pMessage) { if (ErrorStatus < VI_SUCCESS){ printf("\n %s",pMessage); ClosePort(); exit(0); } } void delay(clock_t wait) { clock_t goal; goal = wait + clock(); while( goal > clock() ) ; } End of program 148 E364xA User’s and Service Guide
Application Programs Example Program for Excel 97 5 Example Program for Excel 97 This section contains the example program written using Excel Macros (Visual Basic for Applications) to control your power supply. With Excel, you can take the value of a cell in a spread- sheet, send it to the power supply, and then record the response on the worksheet. The example on the following pages characterizes a component across the terminals of the power supply.
5 Application Programs Example Program for Excel 97 To write an Excel macro: 1 You must first open a module in Excel. 2 Go to the View menu, choose Toolbars, and then select Control Toolbox. The Control Toolbox dialog box appears. 3 Select the Command button in the dialog box. 4 Select cell A1 and drag across cell B3. The CommandButton1 box is created. 5 To change the button name, click the right mouse button on that button and then select Properties. The Properties dialog box appears.
Application Programs Example Program for Excel 97 5 Make any changes necessary to suit your application in the Diode module. You must enter the information in the modules exactly as shown or an error will be generated. If several system errors occur while attempting to run a macro, you may have to reboot your PC to get the GPIB or RS- 232 interface to work properly. NOTE To use the example with Windows 3.1, you will need to modify the declarations at the top of the module. Change visa32.dll to visa.
5 Application Programs Example Program for Excel 97 Private Function OpenPort() Dim GPIB_Address As String Dim COM_Address As String If bGPIB Then GPIB_Address = "5" ' Select GPIB address between 0 to 30 Else COM_Address = "1" ' Set the number to 2 for COM2 port End If ErrorStatus = viOpenDefaultRM(defaultRM) ' Open the VISA session If bGPIB Then ErrorStatus = viOpen(defaultRM, "GPIB0::" & GPIB_Address & "::INSTR", _ 0, 1000, power_supply) Else ErrorStatus = viOpen(defaultRM, "ASRL" & COM_Address & "::INS
Application Programs Example Program for Excel 97 5 Private Function ClosePort() ErrorStatus = viClose(power_supply) ErrorStatus = viClose(defaultRM) End Function Private Function delay(delay_time As Single) Dim Finish As Single Finish = Timer + delay_time Do Loop Until Finish <= Timer End Function Private Function CheckError(ErrorMessage As String) If ErrorStatus < VI_SUCCESS Then Cells(5, 2) = ErrorMessage ClosePort End End If End Function End of program Declaration for Windows 3.
5 Application Programs Example Program for Excel 97 Declaration for Windows 95/NT 4.0 '************************************************************************************ ' Additional declarations for VISA32.DLL are usually in the visa32.bas file in the ' c:\vxipnp\win95(or winNT)\include directory on your PC. Also see the VISA manual. '************************************************************************************ Declare Function viOpenDefaultRM Lib "visa32.
E364xA Dual Output DC Power Supplies User’s and Service Guide 6 Tutorial Overview of the Power Supply Operation 156 Output Characteristics 158 Extending the Voltage Range and Current Range 163 Remote Programming 165 This chapter describes the basic operation of a linear power supply and the operation of this power supply. You will also find information to help you better understand the output characteristics of this power supply as well as an ideal power supply.
6 Tutorial Overview of the Power Supply Operation Overview of the Power Supply Operation The basic design model for power supplies consists of placing a control element in series with the rectifier and load device. Figure 6- 1 shows a simplified schematic of a series regulated supply with the phase- controlled pre- regulator described as a power switch and the series element depicted as a variable resistor.
Tutorial Overview of the Power Supply Operation 6 This power supply has two ranges, allowing more voltage at a lower current or more current at a lower voltage. Single range supplies can only output maximum power at full- scale voltages and full- scale current. This supply can provide output power that is close to maximum at full- scale for both ranges. The pre- regulator in this power supply uses solid state transformer tap switches on the secondary winding of the power transformer.
6 Tutorial Output Characteristics Output Characteristics An ideal constant voltage power supply would have a zero output impedance at all frequencies. Thus, as shown in Figure 6- 3, the voltage would remain perfectly constant in spite of any changes in output current demanded by the load.
Tutorial Output Characteristics 6 The ideal constant current power supply exhibits an infinite output impedance at all frequencies. Thus as Figure 6- 4 indicates, the ideal constant current power supply would accommodate a load resistance change by altering its output voltage by just the amount necessary to maintain its output current at a constant value. The output of this power supply can operate in either the constant voltage (CV) mode or constant current (CC) mode.
6 Tutorial Output Characteristics When the load RL is less than RC, the output current will dominate since the voltage will be less than the set voltage. The power supply is said to be in the constant current mode. The load at point 2 has a relatively low resistance, the output voltage is less than the voltage setting, and the output current is at the current setting. The supply is in the constant current mode and the voltage setting acts as a voltage limit.
Tutorial Output Characteristics 6 Normal mode voltage noise is in the form of ripple related to the line frequency plus some random noise. Both of these are of very low value in the power supply. Careful lead layout and keeping the power supply circuitry away from power devices and other noise sources will keep these values low. Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground.
6 Tutorial Output Characteristics NORMAL MODE NOISE OUTPUT VOLTAGE R <5 mVpp[1] <0.5 mVrms[1] <8 mVpp[2] <1 mVrms[2] OUTPUT TERMINAL COMMON MODE NOISE <1.5 μArms [1] E3646A/E3648A models [2] E3647A/E3649A models Figure 6-6 Simplified diagram of the common mode and normal mode sources of noise When the load changes very rapidly, as when a relay contact is closed, the inductance in the hook up wire and in the power supply output will cause a spike to appear at the load.
Tutorial Extending the Voltage Range and Current Range 6 Extending the Voltage Range and Current Range The power supply may be able to provide voltages and currents greater than its rated maximum outputs if the power- line voltage is at or above its nominal value. Operation can be extended up to 3% over the rated output without damage to the power supply, but performance can not be guaranteed to meet specifications in this region.
6 Tutorial Extending the Voltage Range and Current Range Parallel connections Two or more power supplies being capable of the CV/CC automatic crossover operation can be connected in parallel to obtain a total output current greater than that available from one power supply. The total output current is the sum of the output currents of the individual power supplies. The output of each power supply can be set separately.
Tutorial Remote Programming 6 Remote Programming During remote programming, a constant voltage regulated power supply is called upon to change its output voltage rapidly. The most important factor limiting the speed of output voltage change is the output capacitor and load resistor. Figure 6-7 Speed of response — programming up (full load) The equivalent circuit and the nature of the output voltage waveform when the supply is being programmed upward are shown in Figure 6- 7.
6 Tutorial Remote Programming When this exponential rise reaches the newly programmed voltage level, the constant voltage amplifier resumes its normal regulating action and holds the output constant. Thus, the rise time can be determined approximately using the formula shown in Figure 6- 7.
Tutorial Remote Programming 6 Since up- programming speed is aided by the conduction of the series regulating transistor, while down- programming normally has no active element aiding in the discharge of the output capacitor, laboratory power supplies normally program upward more rapidly than downward.
6 Tutorial Remote Programming THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
E364xA Dual Output DC Power Supplies User’s and Service Guide 7 Characteristics and Specifications Physical Characteristics 170 Environmental Characteristics 172 Electrical Specifications 172 Supplemental Characteristics 174 This chapter lists the characteristics and specifications of the E364xA dual output DC power supplies. NOTE Specifications are warranted in the temperature range of 0 °C to 40 °C with a resistive load.
7 Characteristics and Specifications Physical Characteristics Physical Characteristics Table 7-1 Physical characteristics Parameter E3646A Dimensions (W × H × D) E3647A E3648A E3649A 212.8 mm × 133 mm × 348.3 mm Weight Net 8.2 kg 8.0 kg 9.2 kg 9.1 kg Shipping 10.1 kg 9.9 kg 11.1 kg 11.
Characteristics and Specifications Physical Characteristics 7 Figure 7-2 E364xA dimensions for rack-mounting E364xA User’s and Service Guide 171
7 Characteristics and Specifications Environmental Characteristics Environmental Characteristics Refer to “Environmental Conditions” on page VI. Electrical Specifications Table 7-2 Electrical specifications Parameter E3646A E3647A E3648A E3649A Voltage output (V) Low range 0 V to +8 V 0 V to +35 V 0 V to +8 V 0 V to +35 V (at 0 °C to 40 °C) High range 0 V to +20 V 0 V to +60 V 0 V to +20 V 0 V to +60 V Current output (A) Low range 0 A to 3 A 0 A to 0.8 A 0 A to 5 A 0 A to 1.
Characteristics and Specifications Electrical Specifications 7 Table 7-2 Electrical specifications (continued) Parameter E3646A E3647A E3648A Load regulation Voltage <0.01% + 3 mV ±(% of output + offset) Current <0.01% + 250 μA Line regulation Voltage <0.01% + 3 mV ±(% of output + offset) Current <0.
7 Characteristics and Specifications Supplemental Characteristics Supplemental Characteristics Table 7-3 Supplemental characteristics Parameter E3646A E3647A E3648A E3649A 0 to +8.24 V 0 to +36.05 V 0 to +8.24 V 0 to +36.05 V 0 to 3.09 A 0 to 0.824 A 0 to 5.15 A 0 to 1.442 A 0 to +20.6 V 0 to +61.8 V 0 to +20.6 V 0 to +61.8 V 0 to 1.545 A 0 to 0.515 A 0 to 2.575 A 0 to 0.
Characteristics and Specifications Supplemental Characteristics 7 Table 7-3 Supplemental characteristics (continued) Parameter E3646A Overvoltage protection accuracy <0.5% + 0.5 V E3647A E3648A E3649A ±(% of output + offset) Overvoltage protection response time <1.
7 Characteristics and Specifications Supplemental Characteristics THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
E364xA Dual Output DC Power Supplies User’s and Service Guide 8 Service and Maintenance Overview 178 Operating Checklist 179 Types of Service Available 180 Repacking for Shipment 181 Electrostatic Discharge (ESD) Precautions 182 Replacing the Power-Line Fuse 183 Troubleshooting Hints 184 Self-Test Procedures 186 General Disassembly 188 Recommended Test Equipment 189 Operation Verification and Performance Tests 192 Measurement Techniques 193 Constant Voltage (CV) Verifications 196 Constant Current (CC) Veri
8 Service and Maintenance Overview Overview The power supply must pass the complete self- test before calibration or any of the verification or performance tests can be performed. If the supply fails any of the tests or if abnormal test results are obtained, refer to “Troubleshooting Hints” on page 184.
Service and Maintenance Operating Checklist 8 Operating Checklist Before returning your power supply to Agilent for service or repair, check the following items: Is the power supply inoperative? ✔ Verify that the AC power cord is connected to the power supply. ✔ Verify that the front panel power switch has been pushed. ✔ Verify that the power- line fuse is installed and not open. (Refer to “If the power supply does not turn on” on page 9.) ✔ Verify the power- line voltage setting.
8 Service and Maintenance Types of Service Available Types of Service Available If your power supply fails within three years of the original purchased date, Agilent will repair or replace it free of charge. If your unit fails after your three years warranty expires, Agilent will repair or replace it at a very competitive price. Agilent will make the decision locally whether to repair or replace your unit. Standard repair service (worldwide) Contact your nearest Agilent Service Center.
Service and Maintenance Repacking for Shipment 8 Repacking for Shipment If your unit is shipped to Agilent for service or repair, you need to: • attach a tag to the power supply identifying the owner and indicating the required service or repair. Include the instrument model number and full serial number. • place the power supply in its original container with appropriate packaging material. • secure the container with a strong tape or metal bands.
8 Service and Maintenance Electrostatic Discharge (ESD) Precautions Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling. Component damage can occur at electrostatic discharge voltages as low as 50 V. The following guidelines will help prevent ESD damage when using the power supply or any electronic device. • Disassemble instruments only in a static- free work area.
Service and Maintenance Surface Mount Repair 8 Surface Mount Repair Surface mount components should only be removed using soldering irons or disordering stations expressly designed for surface mount components. Use of conventional solder removal equipment will almost always result in permanent damage to the printed circuit board and will void your Agilent factory warranty. Replacing the Power-Line Fuse The power- line fuse is located within the fuse- holder assembly on the rear panel of the power supply.
8 Service and Maintenance Troubleshooting Hints Troubleshooting Hints This section provides a brief check list of common failures. Before troubleshooting or repairing the power supply, make sure that the failure is in the power supply rather than any external connections. Also make sure that the power supply is accurately calibrated. The circuits of the power supply allow troubleshooting and repair with basic equipment such as a 6½- digit multimeter.
Service and Maintenance Troubleshooting Hints 8 Bias supplies problems Check that the input to the voltage regulators of the bias supplies is at least 1 V greater than their output. Circuit failures can cause heavy loads of the bias supplies which may pull down the regulator output voltages. Check the voltages of the bias supplies as shown in Table 8- 1 and Table 8- 2. Table 8-1 Bias supplies voltages Bias supply Minimum Maximum Check at +5 V floating +4.75 V +5.25 V U14 pin 2 –5.1 V floating –4.
8 Service and Maintenance Self-Test Procedures Self-Test Procedures Power-on self-test Each time the power supply is powered on, a set of self- tests are performed. These tests check that the minimum set of logic and measurement hardware are functioning properly. Failures during the power- on self- test utilize error codes 601 through 604 and 624 through 633. For serial MY53xx6xxx, the power- on self- test utilizes the complete self- test, which covers from error codes 601 through 633.
Service and Maintenance Self-Test Procedures 8 Table 8-3 Self-test error messages (continued) 609[1] This test checks if the ADC hardware is functional. The main controller U10 establishes communication with the ADC and checks if there are any error bits set for the ADC's status reporting.
8 Service and Maintenance General Disassembly General Disassembly Figure 8-1 General disassembly 188 E364xA User’s and Service Guide
Service and Maintenance Recommended Test Equipment 8 Recommended Test Equipment Table 8- 4 describes the test equipment recommended for the performance verification and adjustment procedures. If the exact instrument is not available, use the accuracy requirements shown to select substitute calibration standards. If you use equipment other than the recommended equipment shown in Table 8- 4, you must recalculate the measurement uncertainties for the actual equipment used.
8 Service and Maintenance Recommended Test Equipment Table 8-4 Recommended test equipment Equipment Requirements Recommended model Test function Current monitoring resistor (shunt) RM1 (0.01 Ω, 0.1%)[5] ISOTEK Co. Model: A-H or equivalent Constant current test setup Current monitoring resistor (shunt) RM2 (0.1 Ω/5 Ω, 1%)[5] Vishay Co. Model: LVR-5-43 or equivalent Measure current rms ripple and noise [1] Applicable for E3646A only. [2] Applicable for E3647A only.
Service and Maintenance Test Considerations 8 Test Considerations To ensure proper power supply operation, verify that you have selected the correct power- line voltage prior to attempting any test procedure in this chapter. Refer to “Converting line voltage” on page 12. Ensure that all terminal connections (both front panel and rear panel) are removed while the internal self- test is being performed.
8 Service and Maintenance Operation Verification and Performance Tests Operation Verification and Performance Tests Operation verification tests To ensure that the power supply is operating properly, without testing all specified parameters, perform the following test procedures: • Perform the power- on self- test and follow the procedures for “Checking the output” on page 10. (Refer to “Self- test” on page 53 for more information.
Service and Maintenance Measurement Techniques 8 Measurement Techniques Common test setup Most tests are performed at the front terminals as shown in Figure 8- 2. Measure the DC voltage directly at the (+) and (–) terminals on the front panel.
8 Service and Maintenance Measurement Techniques Current-monitoring resistor To eliminate the output current measurement error caused by the voltage drops in the leads and connections, connect the current- monitoring resistor between the (–) output terminal and the load as a four- terminal device. Connect the current- monitoring leads inside the load- lead connections directly at the monitoring points on the resistor element (Refer to RM in Figure 8- 2).
Service and Maintenance Measurement Techniques 8 Electronic load Many of the test procedures require the use of a variable load resistor capable of dissipating the required power. Using a variable load resistor requires that switches should be used to connect, disconnect, and short the load resistor. An electronic load, if available, can be used in place of a variable load resistor and switches. The electronic load is considerably easier to use than load resistors.
8 Service and Maintenance Constant Voltage (CV) Verifications Constant Voltage (CV) Verifications Constant voltage test setup If more than one meter or if a meter and an oscilloscope are used, connect each to the (+) and (–) terminals by a separate pair of leads to avoid mutual coupling effects. Use a coaxial cable or a shielded 2- wire cable to avoid noise pick- up on the test leads. Table 8-5 Verification programming values Model Low voltage range High voltage range E3646A 8 V/3 A 20 V/1.
Service and Maintenance Constant Voltage (CV) Verifications 8 2 Turn on the power supply. Select the output to be tested and the high voltage range (20 V/1.5 A) and then enable the output by sending the following commands: INST:SEL {OUT1|OUT2} VOLT:RANG P20V (E3646A model) OUTP ON 3 Program the output voltage to 0 V and current to the full- scale rated value (1.5 A)[1] by sending the following commands: VOLT 0 CURR 1.5 (E3646A model) 4 Record the output voltage reading on the digital voltmeter (DVM).
8 Service and Maintenance Constant Voltage (CV) Verifications 10 Record the value displayed on the controller. This value should be within the limit of (DVM ±15 mV)[1] or (DVM ±35 mV)[2] for output1, or (DVM ±45 mV)[1] or (DVM ± 85 mV)[2] for output2. 11 Repeat step 1 through step 10 for the other output. CV load effect (load regulation) This test measures the immediate change in the output voltage resulting from a change in the output current from full to no load.
Service and Maintenance Constant Voltage (CV) Verifications 8 5 Repeat step 1 through step 4 for the other output. CV source effect (line regulation) This test measures the immediate change in output voltage that results from a change in AC line voltage from the minimum value (10% below the nominal input voltage) to the maximum value (10% above the nominal input voltage).
8 Service and Maintenance Constant Voltage (CV) Verifications 7 Repeat step 1 through step 6 for the other output. CV PARD (ripple and noise) Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual AC voltage superimposed on the DC output voltage. CV PARD is specified as the rms or peak- to- peak output voltage in the frequency range from 20 Hz to 20 MHz.
Service and Maintenance Constant Voltage (CV) Verifications 8 Rms voltmeter BNC Receptacle Rms voltmeter Input BNC Cable Split Ferrites* Input Load Resistor Load Resistor (Front Panel Connections) (Rear Panel Connections) Figure 8-4 CV PARD (ripple and noise) NOTE For better measurement results, it is recommended to make the connection between the BNC receptacle and the output terminals as short as possible, and to use the recommended split ferrites with the BNC-to-BNC cable as shown in Figure
8 Service and Maintenance Constant Voltage (CV) Verifications 2 Turn on the power supply. Select the high voltage range (20 V/1.545 A)[1], enable the output, and set the display to the limit mode. When the display is in the limit mode, program the current to the maximum programmable value (1.545 A)[2] and the voltage to the full rated value (20.0 V)[1]. 3 Check that the front panel CV annunciator remains lit. If it is not lit, adjust the load down slightly.
Service and Maintenance Constant Voltage (CV) Verifications 8 3 Set the electronic load current to half of the power supply full rated current value, the electronic load to the transient operation mode with the transient level to the power supply full rated current value, and the output’s full rated value at a 1 kHz rate with 50% duty cycle. 4 Set the oscilloscope for AC coupling, internal sync, and lock on either the positive or negative load transient.
8 Service and Maintenance Constant Current (CC) Verifications Constant Current (CC) Verifications Constant current test setup Follow the general setup instructions in “General measurement techniques” on page 194, and the specific instructions will be given in the following paragraphs. Current programming and readback accuracy This test verifies that the current programming and GPIB or RS- 232 readback functions are within specifications.
Service and Maintenance Constant Current (CC) Verifications 8 3 Program the output voltage to the full- scale rated voltage (8.0 V)[1] and output current to 0 A by sending the following commands: VOLT 8 (E3646A model) CURR 0 4 Divide the voltage drop (DVM reading) across the current monitoring resistor (RM) by its resistance to convert to amperes and record this value (I0). This value should be within the limit of (0 A ±10 mA).
8 Service and Maintenance Constant Current (CC) Verifications 10 Record the value displayed on the controller. This value should be within the limit of: E3646A E3647A E3648A E3649A Output1 (IO ±9.5 mA) (IO ±6.2 mA) (IO ±12.5 mA) (IO ±7.1 mA) Output2 (IO ±14.5 mA) (IO ±11.2 mA) (IO ±17.5 mA) (IO ±12.1 mA) 11 Repeat step 1 through step 10 for the other output.
Service and Maintenance Constant Current (CC) Verifications 8 4 Operate the electronic load in the short (input short) mode. Record the current reading immediately by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor. The difference between the current readings in step 3 and step 4 is the load regulation current. The difference of the readings during the immediate change should be within the following limits: E3646A E3647A E3648A E3649A 0.
8 Service and Maintenance Constant Current (CC) Verifications 5 Adjust the transformer to the low line voltage limit (104 Vac for nominal 115 Vac, 90 Vac for nominal 100 Vac, or 207 Vac for nominal 230 Vac). Record the output current reading by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor.
Service and Maintenance Constant Current (CC) Verifications 8 Rms voltmeter Input Rms voltmeter Current Monitoring Resistor Split Ferrites BNC Receptacle Current Monitoring Resistor Input BNC Cable (Front Panel Connections) (Rear Panel Connections) Figure 8-6 CC PARD connections (ripple and noise) 1 Turn off the power supply and connect the output to be tested as shown in Figure 8- 6 with the current monitoring resistor 0.2 Ω (RM2) across output terminals.
8 Service and Maintenance Common Mode Current Noise Common Mode Current Noise The common mode current is the AC current component which exists between the output or output lines and chassis ground. Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground. When a circuit is referenced to earth ground, a low level line- related AC current will flow from the output terminals to earth ground.
Service and Maintenance Performance Test Record 8 Performance Test Record Table 8-6 CV performance test record Test description Models Output Actual result Specifications Upper limit Lower limit Output1 +0.0100 V –0.0100 V Output2 +0.0250 V +0.0250 V Output1 DVM + 0.0050 V DVM – 0.0050 V Output2 DVM + 0.0250 V DVM – 0.0250 V CV programming accuracy at 0 V (DVM reading) all CV readback accuracy at 0 V all CV programming accuracy at full-scale (DVM reading) E3646A/E3648A Output1 20.
8 Service and Maintenance Performance Test Record Table 8-7 CC performance test record Test description Models Output Actual result Specifications Upper limit Lower limit +0.0100 A –0.0100 A CC programming accuracy at 0 A (IO) all all CC readback accuracy at 0 A all Output1 IO + 0.0050 A IO – 0.0050 A Output2 IO + 0.0100 A IO – 0.0100 A CC programming accuracy at full-scale (IO) E3646A all 3.01600 A 2.9840 A E3647A all 0.8116 A 0.7884 A E3648A all 5.02 A 4.
Service and Maintenance Performance Test Record 8 Table 8-7 CC performance test record (continued) Test description Models Output Actual result Specifications Upper limit Lower limit CC PARD (normal mode) all all <4 mA rms CC PARD (common mode) all all <1.
8 Service and Maintenance Calibration Reference Calibration Reference Before you calibrate the power supply, you must unsecure it by entering the correct security code. Refer to “Calibration” on page 61 for more detailed procedures to unsecure or secure the power supply. Agilent calibration services When your power supply is due for calibration, contact your local Agilent Service Center for a low- cost calibration.
Service and Maintenance Calibration Reference 8 3 Connect the power cord and turn on the calibration mode by holding down the Calibrate key as you turn on the power supply and hold down the key until you hear a long beep. Be careful not to touch the power line connections. 4 Apply a short between the two exposed metal pads on JP3[1] (located near U17).
8 Service and Maintenance General Calibration or Adjustment Procedure General Calibration or Adjustment Procedure NOTE The power supply should be calibrated after a 1-hour warm-up with no load connected. Perform the voltage calibration prior to the OVP calibration. The front panel calibration procedures are described in this section. • For voltage calibration, disconnect all loads from the power supply and connect a digital voltmeter (DVM) across the output terminals.
Service and Maintenance General Calibration or Adjustment Procedure 8 Table 8-8 Parameters for calibration (continued) Output Calibration parameter Voltage/Current Calibration point mnemonic Output 2 VOLT2 CAL Voltage V LO V MI V HI OVP2 CAL OVP None CURR2 CAL Current I LO I MI I HI Front panel voltage and current calibration Before attempting to calibrate the power supply, you must unsecure the power supply, and disconnect all loads from the power supply and connect a DVM across the output
8 Service and Maintenance General Calibration or Adjustment Procedure Voltage and OVP calibration View Calibrate 2 Move down a level to the voltage calibration mode. VOLT1 CAL View Calibrate 3 Select the low- end voltage calibration point. V LO 0.300,0 4 Enter the reading you obtained from the DVM by using the knob and resolution selection keys. V LO 0.305,0 View Calibrate 5 Save the changes and select the middle voltage calibration point. V MI 10.
Service and Maintenance General Calibration or Adjustment Procedure View Calibrate 8 10 Run the OVP calibration. CALIBRATING The message above is displayed to indicate that the calibration is in progress. It takes approximately 10 seconds to complete the calibration. If the calibration fails, an error message will be displayed for a second and you will hear a beep, and then return to the OVP calibration mode again. Current calibration Connect an appropriate shunt 0.
8 Service and Maintenance General Calibration or Adjustment Procedure View Calibrate 15 Save the change and select the high current calibration point. I HI 2.800,0 16 Enter the computed value (DVM reading divided by the shunt resistance) by using the knob and resolution selection keys. I HI 2.789,0 View Calibrate 17 Save the new current calibration constants for the output1 and go to the calibration mode for the output2.
Service and Maintenance Calibration Record 8 Calibration Record Table 8-9 Calibration record Step Calibration description 1 Turn on the calibration mode by holding down the Calibrate key as you turn on the power supply until you hear a long beep. 2 Unsecure the power supply if secured. (Refer to “Calibration security” on page 61.) 3 Press the Calibrate key to move down the menu to the voltage calibration menu. The VOLT1 CAL message is displayed.
8 Service and Maintenance Calibration Error Messages Table 8-9 Calibration record (continued) Step Calibration description Measurement mode (DVM) Supply being adjusted 11 A high current calibration point is displayed. Enter the computed value (DVM reading divided by the shunt resistance) by using the knob and resolution keys. Press the Calibrate key to save the changes. A High current calibration 12 Repeat step 3 through step 16 for the output2 calibration.
Service and Maintenance Calibration Error Messages 8 Table 8-10 Calibration error messages (continued) 718 Gain out of range for Gain Error Correction 740 Cal checksum failed, secure state 741 Cal checksum failed, string data 743 Cal checksum failed, store/recall data in location 1 744 Cal checksum failed, store/recall data in location 2 745 Cal checksum failed, store/recall data in location 3 746 Cal checksum failed, DAC cal constants 747 Cal checksum failed, readback cal constants 748 C
8 Service and Maintenance Calibration Error Messages THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
Service and Maintenance Component Locator Diagram 8 Component Locator Diagram Component locator diagram for the main board assembly — top E364xA User’s and Service Guide 225
8 Service and Maintenance Component Locator Diagram Component locator diagram for the main board assembly — bottom 226 E364xA User’s and Service Guide
Service and Maintenance Component Locator Diagram 8 Component locator diagram for the digital board assembly — top E364xA User’s and Service Guide 227
8 Service and Maintenance Component Locator Diagram Component locator diagram for the digital board assembly — bottom 228 E364xA User’s and Service Guide
Service and Maintenance Component Locator Diagram 8 Component locator diagram for the front panel — top E364xA User’s and Service Guide 229
8 Service and Maintenance Component Locator Diagram Component locator diagram for the main board assembly — top (serial MY53xx6xxx) 230 E364xA User’s and Service Guide
Service and Maintenance Component Locator Diagram 8 Component locator diagram for the main board assembly — bottom (serial MY53xx6xxx) E364xA User’s and Service Guide 231
8 Service and Maintenance Component Locator Diagram Component locator diagram for the digital board assembly — top (serial MY53xx6xxx) 232 E364xA User’s and Service Guide
Service and Maintenance Component Locator Diagram 8 Component locator diagram for the digital board assembly — bottom (serial MY53xx6xxx) E364xA User’s and Service Guide 233
8 Service and Maintenance Component Locator Diagram Component locator diagram for the front panel — top (serial MY53xx6xxx) 234 E364xA User’s and Service Guide
www.agilent.
