Service Guide Part Number: E3634-90010 Seventh Edition, April 21, 2014 © Copyright Agilent Technologies, Inc. 1998–2014 All Rights Reserved.
The Agilent E3633A and Agilent E3634A are high performance 200 watt singleoutput dual range programmable DC power supplies with both 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.
The Front Panel at a Glance 1 8V/20A range selection key (E3633A) 25V/7A range selection key (E3634A) 2 20V/10A range selection key (E3633A) 50V/4A range selection key (E3634A) 3 Overvoltage protection key 4 Overcurrent protection key 5 Display limit key 6 Recall operating state key 7 8 9 10 11 12 13 Store operating state/Local key Error/Calibrate key I/O Configuration/Secure key Output On/Off key Control knob Resolution selection keys Voltage/current adjust selection key 3
1 8V/20A* or 25V/7A** range selection key Selects the 8V/20A or 25V/7A range and allows the full rated output to 8V/20A or 25V/7A. 2 20V/10A* or 50V/4A** range selection key Selects the 20V/10A or 50V/4A range and allows the full rated output to 20V/10A or 50V/4A. 3 Overvoltage protection key Enables or disables the overvoltage protection function, sets trip voltage level, and clears the overvoltage condition.
Front-Panel Voltage and Current Limit Settings You can set the voltage and current limit values from the front panel using the following method. Use the voltage/current adjust selection key, the resolution selection keys, and the control knob to change the voltage and current limit values. 1 Select the desired range using the range selection keys after turning on the power supply. 2 Press the Display key to show the limit values on the display.
Display Annunciators Adrs Rmt 8V 20V 25V 50V OVP Power supply is addressed to listen or talk over a remote interface. Power supply is in remote interface mode. Shows the 8V/20A range is selected. (Agilent E3633A model) Shows the 20V/10A range is selected. (Agilent E3633A model) Shows the 25V/7A range is selected. (Agilent E3634A model) Shows the 50V/4A range is selected.
The Rear Panel at a Glance 1 2 3 4 Power-line voltage setting Power-line fuse-holder assembly AC inlet Power-line module 5 GPIB (IEEE-488) interface connector 6 RS-232 interface connector 7 Rear output terminals Use the front-panel I/O Config key to: • Select the GPIB or RS-232 interface (see chapter 3 in User’s Guide). • Set the GPIB bus address (see chapter 3 in User’s Guide). • Set the RS-232 baud rate and parity (see chapter 3 in User’s Guide).
In This Book This is the Service Guide for your Agilent E3633A and E3634A DC power supplies. Unless otherwise stated, the information in this manual applies to both two models. Specifications Chapter 1 lists the power supply’s specifications and describes how to interpret these specifications. Quick Start Chapter 2 prepares the power supply for use and helps you get familiar with the front panel features. Calibration Procedures Chapter 3 provides performance verification and calibration procedures.
Contents Chapter 1 Specifications Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15 Supplemental Characteristics- - - - - - - - - - - - - - - - - - - - - - - - - - - 17 Chapter 2 Quick Start To Prepare the Power Supply for Use - - - - - - - - - - - - - - - - - - - - To Check the Rated Voltages of the Power Supply - - - - - - - - - - - To Check the Rated Currents of the Power Supply - - - - - - - - - - - To Use the Power Supply in Constant Voltage Mode - - - - - - - - - T
CV Load Effect (Load Regulation) - - - - - - - - - - - - - - - - - - - CV Source effect (Line Regulation) - - - - - - - - - - - - - - - - - - CV PARD (Ripple and Noise) - - - - - - - - - - - - - - - - - - - - - - Load Transient Response Time- - - - - - - - - - - - - - - - - - - - - - Constant Current (CC) Verifications- - - - - - - - - - - - - - - - - - - - - Constant Current Test Setup- - - - - - - - - - - - - - - - - - - - - - - - Current Programming and Readback Accuracy - - - - - - - - - - - CC Load Eff
Express Exchange (U.S.A.
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1 Specifications
Specifications The performance specifications are listed in the following pages. Specifications are warranted in the temperature range of 0 to 40°C with a resistive load. Supplemental characteristics, which are not warranted but are descriptions of performance determined either by design or testing. Chapter 3 ‘‘Calibration Procedures’’ contains procedures for verifying the performance specifications.
Chapter 1 Specifications Performance Specifications 1 Performance Specifications Table 1-1. Performance Specifications Parameter Output Ratings (@ 0 °C - 40 °C) Accuracy[1] Programming 12 months (@ 25 °C ± 5 °C), ±(% of output + offset) Agilent E3633A Agilent E3634A Low Range 0 to +8 V/0 to 20 A 0 to +25 V/0 to 7 A High Range 0 to +20 V/0 to 10 A 0 to +50V/0 to 4 A Voltage 0.05% + 10 mV Current 0.
Chapter 1 Specifications Performance Specifications Transient Response Time Less than 50 μsec for output to recover to within 15 mV following a change in output current from full load to half load or vice versa Command Processing Time Average time for output voltage to begin to change after receipt of digital data when the power supply is connected directly to the GPIB or RS-232 is less than 100 msec OVP and OCP Accuracy, ±(% of output + offset) OVP OCP 0.5% + 0.5 V 0.5% + 0.
Chapter 1 Specifications Supplemental Characteristics 1 Supplemental Characteristics Table 1-2. Supplemental Characteristics Parameter Agilent E3633A Agilent E3634A Output Programming Range Low Range (maximum programmable values) 0 to +8.24 V/ 0 to 20.6 A 0 to +25.75 V/ 0 to 7.21 A High Range 0 to +20.6 V/ 0 to 10.3 A 0 to +51.5V/ 0 to 4.12 A OVP 1 V to 22 V 1 V to 55 V OCP 0 A to 22 A 0 A to 7.
Chapter 1 Specifications Supplemental Characteristics Output Voltage Overshoot During turn-on or turn-off of ac power, output plus overshoot will not exceed 1 V if the output control is set to less than 1 V. If the output control is set to 1 V or higher, there is no overshoot.
Chapter 1 Specifications Supplemental Characteristics 1 Storage Temperature -20 to 70 °C for storage environment. Environmental Conditions Designed for indoor use in an installation category II, pollution degree 2 environment. Designed to operate at a maximum relative humidity of 95 % and at altitudes of up to 2000 meters. Dimensions* 213 mmW x 133 mmH x 348 mmD (8.4 x 5.2 x 13.7 in) *See below for detailed information. Weight Net Shipping 9.
Chapter 1 Specifications Supplemental Characteristics Figure 8-1.
2 Quick Start
Quick Start One of the first things you will want to do with your power supply is to become acquainted with its front panel. Written procedures in this chapter prepare the power supply for use and familiarize you with most front-panel operations. • The power supply is shipped from the factory configured in the front-panel operation mode. At power-on, the power supply is automatically set to operate in the front-panel operation mode. When in this mode, the front-panel keys can be used.
Chapter 2 Quick Start To Prepare the Power Supply for Use To Prepare the Power Supply for Use The following steps help you verify that the power supply is ready for use. 1 Check the list of supplied items. Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Agilent Technologies Sales Office. One power cord for your location. One User’s Guide. This Service Guide. Certificate of Calibration.
Chapter 2 Quick Start To Prepare the Power Supply for Use 1 Remove the power cord. Remove the fuse-holder assembly with a flat-blade screwdriver from the rear panel. 2 Install the correct line fuse. Remove the power-line voltage selector from the power-line module. 100 or 115 Vac, 6.3 AT fuse 230 Vac, 3.15 AT fuse 3 Rotate the power-line voltage selector until the correct voltage appears. 4 Replace the power-line voltage selector and the fuse-holder assembly in the rear panel.
Chapter 2 Quick Start To Check the Rated Voltages of the Power Supply To Check the Rated Voltages of the Power Supply The following procedures check to ensure that the power supply produces its rated voltage output with no load and properly responds to operation from the front panel. For each step, use the keys shown on the left margins. Power 1 Turn on the power supply.
Chapter 2 Quick Start To Check the Rated Currents of the Power Supply To Check the Rated Currents of the Power Supply The following procedures check to ensure that the power supply produces its rated current outputs with a short and properly responds to operation from the front panel. For each step, use the keys shown on the left margins. Power 1 Turn on the power supply.
Chapter 2 Quick Start To Check the Rated Currents of the Power Supply 1 6 Ensure that the current can be adjusted from zero to the maximum rated value. Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates ‘‘20.0 amps’’* or ‘‘7.0 amps’’**. Note If an error has been detected during the output checkout procedures, the ERROR annunciator will turn on. See “Error Messages’’ for more information, starting on page 123 in chapter 5 of the User’s Guide.
Chapter 2 Quick Start To Use the Power Supply in Constant Voltage Mode To Use the Power Supply in Constant Voltage Mode To set up the power supply for constant voltage (CV) operation, proceed as follows. For each step, use the keys shown on the left margin. 1 Connect a load to the desired output terminals. With power-off, connect a load to the desired output terminals. Power 2 Turn on the power supply.
Chapter 2 Quick Start To Use the Power Supply in Constant Voltage Mode Voltage Current Display Limit Output On/Off 1 5 Adjust the knob for the desired output voltage. Check that the Limit annunciator still flashes. Set the knob for voltage control. The second digit of the voltmeter will be flashing. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output voltage. 6 Return to the meter mode.
Chapter 2 Quick Start To Use the Power Supply in Constant Current Mode To Use the Power Supply in Constant Current Mode To set up the power supply for constant current (CC) operation, proceed as follows. 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.
Chapter 2 Quick Start To Use the Power Supply in Constant Current Mode Voltage Current Display Limit Output On/Off 1 5 Adjust the knob for the desired output current. Check that the Limit annunciator still flashes. Set the knob for current control. The second digit of the ammeter will be flashing. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output current. 6 Return to the meter mode.
Chapter 2 Quick Start To Store and Recall the Instrument State To Store and Recall the Instrument State You can store up to three different operating states in non-volatile memory. This also enables you to recall the entire instrument configuration with just a few key presses from the front panel. The memory locations are supplied with the reset states from the factory for frontpanel operation. Refer to the description of *RST command, starting on page 96 in the User’s Guide for more information.
Chapter 2 Quick Start To Store and Recall the Instrument State Store 4 Save the operating state. The operating state is now stored. To recall the stored state, go to the following steps. 2 DONE Recall 5 Turn on the recall mode. Memory location “1” will be displayed in the recall mode. RECALL 1 This message appears on the display for approximately 3 seconds. 6 Recall the stored operating state. Turn the knob to the right to change the displayed storage location to 3.
Chapter 2 Quick Start To Program Overvoltage Protection To Program Overvoltage Protection Overvoltage protection guards the load against output voltages that reach a specified value greater than the programmed protection level. It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 volts, or by programming the output to 1 volt when the trip level is set to less than 3 volts.
Chapter 2 Quick Start To Program Overvoltage Protection Over Voltage 5 Exit the OVP menu. CHANGED The “CHANGED” message is highlighted for a second to show that the new OVP trip level is now in effect. If the OVP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OVP menu and the display will return to the meter mode. Check that the OVP annunciator turns on. Checking OVP Operation To check OVP operation, raise the output voltage to near the trip point.
Chapter 2 Quick Start To Program Overvoltage Protection Over Voltage 3 Clear the overvoltage condition and exit this menu. Now, when you press Over Voltage key again, the “DONE” message is displayed for a second and the OVP annunciator will not blink any more. The output will return to meter mode. • Adjust OVP trip level Over Voltage Over Voltage 1 Raise the OVP trip level. Press Over Voltage key and turn the knob to raise the OVP trip level. 2 Move to the OVP CLEAR mode.
Chapter 2 Quick Start To Program Overcurrent Protection To Program Overcurrent Protection Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level. It is accomplished by programming the output current to zero. The following steps show how to set the overcurrent protection trip level, how to check OCP operation and how to clear overcurrent condition.
Chapter 2 Quick Start To Program Overcurrent Protection Over Current 5 Exit the OCP menu. CHANGED The “CHANGED” message is displayed for a second to show that the new OCP trip level is now in effect. If the OCP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OCP menu and the display will return to the meter mode. Check that the OCP annunciator turns on. Checking OCP Operation To check OCP operation, raise the output current to near the trip point.
Chapter 2 Quick Start To Program Overcurrent Protection Over Current 3 Clear the overcurrent condition and exit this menu. Now, when you press Over Current key again, the “DONE’’ message is displayed for a second and the OCP annunciator will not blink any more. The output will return to meter mode. The knob is selected for current control. Notice that the power supply is operated in the constant current (CC) mode. • Adjust OCP trip level Over Current Over Current 1 Raise the OCP trip level.
Chapter 2 Quick Start To Rack Mount the Power Supply To Rack Mount the Power Supply The power supply can be mounted in a standard 19-inch rack cabinet using one of three optional kits available. A rack-mounting kit for a single instrument is available as Option 1CM (P/N 5063-9243). Installation instructions and hardware are included with each rack-mounting kit. Any Agilent System II instrument of the same size can be rack-mounted beside the Agilent E3633A or E3634A DC power supply.
Chapter 2 Quick Start To Rack Mount the Power Supply 2 To rack mount two instruments of the same depth side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214. To install two instruments in a sliding support shelf, order support shelf 5063-9256, and slide kit 1494-0015.
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3 Calibration Procedures
Calibration Procedures This chapter contains procedures for verification of the power supply’s performance and calibration (adjustment).
Chapter 3 Calibration Procedures Agilent Technologies Calibration Services Note If you calibrate the power supply over the remote interface, you must send the *RST command to the power supply or turn the power supply off and on again after performing a calibration to ensure proper power supply operation. Closed-Case Electronic Calibration The power supply features closed-case electronic calibration since no internal mechanical adjustments are required for normal calibration.
Chapter 3 Calibration Procedures Test Considerations You can also enter calibration constants from the remote interface. Remote operation is similar to the local front-panel procedure. You can use a computer to perform the adjustment by first selecting the required setup. The calibration value is sent to the power supply and then the calibration is initiated over the remote interface. The power supply must be unsecured prior to initiating the calibration procedure.
Chapter 3 Calibration Procedures Recommended Test Equipment Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, use the accuracy requirements shown to select substitute calibration standards. If you use equipment other than that recommended in Table 3-1, you must recalculate the measurement uncertainties for the actual equipment used. Table 3-1.
Chapter 3 Calibration Procedures Performance Verification Tests Performance Verification Tests The performance verification tests use the power supply’s specifications listed in chapter 1, ‘‘Specifications’’, starting on page 13. You can perform two different levels of performance verification tests: • Self-Test A series of internal verification tests that provide high confidence that the power supply is operational.
Chapter 3 Calibration Procedures Measurement Techniques Measurement Techniques Setup for Most Tests Most tests are performed at the front terminals as shown in the following figure. Measure the dc voltage directly at the (+) and (-) terminals on the front panel. 3 Figure 3-1. Performance Verification Test Setup Electronic Load Many of the test procedures require the use of a variable load resistor capable of dissipating the required power.
Chapter 3 Calibration Procedures Measurement Techniques General Measurement Techniques To achieve best results when measuring load regulation, peak to peak voltage, and transient response time of the power supply, measuring devices must be connected through the hole in the neck of the binding post at (A) while the load resistor is plugged into the front of the output terminals at (B). A measurement made across the load includes the impedance of the leads to the load.
Chapter 3 Calibration Procedures 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 coaxial cable or shielded 2-wire cable to avoid noise pick-up on the test leads.
Chapter 3 Calibration Procedures Constant Voltage (CV) Verifications 7 Program the output voltage to full rated value (20.0 V)* or (50.0 V)** by sending the command: VOLT 20.0 (E3633A) VOLT 50.0 (E3634A) 8 Record the output voltage reading on the digital voltmeter (DVM). The reading should be within the limit of (20 V ± 20 mV)* or (50 V ± 35mV)**. 9 Readback the output voltage over the remote interface by sending the command: MEAS:VOLT? 10 Record the value displayed on the controller.
Chapter 3 Calibration Procedures Constant Voltage (CV) Verifications 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 maximum value (10% above the nominal input voltage). 1 Turn off the power supply and connect a digital voltmeter between the (+) and (-) terminals of the output to be tested as shown in Figure 3-1.
Chapter 3 Calibration Procedures Constant Voltage (CV) Verifications 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.
Chapter 3 Calibration Procedures Constant Voltage (CV) Verifications Load Transient Response Time This test measures the time for the output voltage to recover to within 15 mV of nominal output voltage following a load change from full load to half load, or half load to full load. 1 Turn off the power supply and connect the output to be tested as shown in Figure 31 with an oscilloscope. Operate the electronic load in constant current mode. 2 Turn on the power supply.
Chapter 3 Calibration Procedures Constant Current (CC) Verifications Constant Current (CC) Verifications Constant Current Test Setup Follow the general setup instructions in the ‘‘Measurement Techniques’’ section, starting on page 50 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.
Chapter 3 Calibration Procedures Constant Current (CC) Verifications 7 Program the output current to the full rated value (20.0 A)* or (7.0 A)** by sending the command: CURR 20.0 (E3633A) CURR 7.0 (E3634A) 8 Divide the voltage drop (DVM reading) across the current monitoring resistor (RM) by its resistance to convert to amps and record this value (IO). This value should be within the limit of (20 A ± 50 mA)* or (7A ± 24 mA)**.
Chapter 3 Calibration Procedures Constant Current (CC) Verifications CC Source Effect (Line Regulation) This test measures the immediate change in output current 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 nominal voltage). 1 Turn off the power supply and connect the output to be tested as shown in Figure 31 with the digital voltmeter connected across the current monitoring resistor (RM).
Chapter 3 Calibration Procedures Common Mode Current Noise 3 The output current should be at the full rated rating with the CC annunciator on. If not lit, adjust the load so that the output voltage drops slightly until the CC annunciator lights. 4 Divide the reading on the rms voltmeter by the load resistance to obtain rms current. The readings should be within the limit of 2 mA.
Chapter 3 Calibration Procedures Performance Test Record for Agilent E3633A and E3634A Performance Test Record for Agilent E3633A and E3634A CV Performance Test Record Test Description Models Actual Result Specifications Upper Limit Lower Limit CV Programming Accuracy @ 0 volts (DVM reading) both +0.0100 V -0.0100 V CV Readback Accuracy @ 0 volts both DVM + 0.0050 V DVM - 0.0050 V CV Programming Accuracy @ Full Scale (DVM reading) (E3633A) +20.0200 V 19.9800 V (E3634A) +50.0350 V 49.
Chapter 3 Calibration Procedures Calibration Security Code Calibration Security Code This feature allows you to enter a security code (electronic key) to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured. Before you can calibrate the power supply, you must unsecure it by entering the correct security code. A procedure to unsecure the power supply is given on the following page.
Chapter 3 Calibration Procedures Calibration Security Code To Unsecure the Power Supply for Calibration The power supply can use a calibration security code to prevent unauthorized or accidental calibration. This procedure shows you how to unsecure the power supply for calibration from the front panel. Error Calibrate 1 Turn on the front-panel calibration mode.
Chapter 3 Calibration Procedures Calibration Security Code I/O Config Secure 4 Unsecure the power supply. UNSECURED I/O The power supply is unsecured when you press Config (Secure) key. You will see the Secure above message from the front panel for one second. The ‘‘CAL MODE’’ message is displayed on the front panel after above message. Power 5 Turn off the calibration mode. Turn off the power supply to exit the calibration mode.
Chapter 3 Calibration Procedures Calibration Count Calibration Count The calibration count feature provides an independent ‘‘serialization’’ of your calibrations. You can determine the number of times that your power supply has been calibrated. By monitoring the calibration count, you can determine whether an unauthorized calibration has been performed. Since the value increments by one for each calibration parameter (see Table 3-2 on the next page), a complete calibration increases the value by 5 counts.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure General Calibration/Adjustment Procedure The calibration procedures from the front panel are described in this section. For voltage calibration, disconnect all loads from the power supply and connect a DVM across the output terminals. For current calibration, disconnect all loads from the power supply, connect an appropriate current monitoring resistor 0.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure Front Panel Voltage and Current Calibration 1 Unsecure the power supply. To calibrate the voltage and current, you must unsecure the power supply according to the procedure given on page 62. 2 Disconnect all loads from the power supply and connect a DVM across output terminals. Error Calibrate 3 Turn on the calibration mode.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure 6 Read the DVM and change the low voltage value on the display to match the measured voltage. For example, if the DVM reading is 0.4500 V, adjust the voltage to 0.4500 V using the knob and resolution selection keys. V LO 0.4500 V Error Calibrate Error 7 Pressing Calibrate (Calibrate) key saves the change and selects the middle voltage calibration point. (‘‘V MI 25.000 V’’ - E3634A model) V MI 10.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure 10 Read the DVM and change the high voltage value on the display to match the measured voltage. For example, if the DVM reads 19.495 V, adjust the voltage to 19.495 V using the knob and arrow keys. V HI 19.495 V Error Calibrate Error 11 Pressing Calibrate (Calibrate) key saves the new voltage calibration constants, and goes to the OVP calibration mode.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure If the calibration fails, a ‘‘OVP CAL FAIL’’ message appears for one second and the display shows the ‘‘CAL SETUP 2’’ for OVP calibration again. Error Calibrate 13 Select the low current calibration point. (‘‘I LO 0.2000 A’’ - E3634A model) I LO 0.5000 A (E3633A) The display shows the low current calibration point.
Chapter 3 Calibration Procedures General Calibration/Adjustment Procedure Error Calibrate 17 Pressing the ‘‘Calibrate’’ key saves the change and selects the high current calibration point. (‘‘I HI 6.9000 A’’ - E3634A model) I HI 19.500 A (E3633A) If the entered number is within an acceptable range, an ‘‘ENTERED’’ message appears for one second.
Chapter 3 Calibration Procedures Aborting a Calibration in Progress Error Calibrate 20 Pressing the ‘‘Calibrate’’ key saves the new OCP calibration constants and return to the calibration mode. CAL MODE A ‘‘CALIBRATING’’ message appears for several seconds to indicate that the OCP calibration is progressing and new OCP calibration constants of ‘‘SETUP 4’’ are stored. Then the display will return to the calibration mode.
Chapter 3 Calibration Procedures Calibration Record for Agilent E3633A/E3634A Calibration Record for Agilent E3633A/E3634A Step Measurement Mode (DVM) Calibration Description Supply Being Adjusted 1 Unsecure the power supply (see page 62). 2 Turn on ‘‘CAL MODE’’ (hold down ‘‘Calibrate’’ and ‘‘Power’’ keys as you turn on the power supply until you hear a long beep). 3 Move down menu to ‘‘CAL SETUP 1’’ (press ‘‘Calibrate’’ key).
Chapter 3 Calibration Procedures Error Messages Error Messages The following tables are abbreviated lists of error messages for the E3633A and E3634A. The errors listed are the most likely errors to be encountered during calibration and adjustment. A more complete list of error messages and descriptions is contained in chapter 5 of the E3633A and E3634A User’s Guide.
Chapter 3 Calibration Procedures Error Messages Self-Test Error Messages Error 601 602 603 604 605 606 607 608 609[1] 624 625 626 630 631 632 Error Messages Front panel does not respond RAM read/write failed A/D sync stuck A/D slope convergence failed Cannot calibrate rundown gain Rundown gain out of range Rundown too noisy Serial configuration readback failed System ADC test failed Unable to sense line frequency I/O processor does not respond I/O processor failed self-test Fan test failed System DAC test
Chapter 3 Calibration Procedures Error Messages Calibration Error Messages Error 701 702 703 704 705 708 712 713 714 715 716 717 718 740 741 742 743 744 745 746 747 748 749 750 Error Messages Cal security disabled by jumper Cal secured Invalid secure code Secure code too long Cal aborted Cal output disabled Bad DAC cal data Bad readback cal data Bad OVP cal data Bad OCP cal data Bad DAC DNL error correction data Cal OVP or OCP status enabled Gain out of range for gain error correction Cal checksum failed,
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration An Example program of Excel 97 for Calibration This section contains an Excel Macros (Visual Basic® for Applications) program for calibration over the GPIB interface. This program makes software adjustments to the E3633A power supply using a current shunt and a digital multimeter which is connected to the controller. In this program a 0.001 ohm current shunt is used.
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration If DacErrorCorrection = False Then ClosePort Exit Sub End If shunt = 0.001 'Change the current shunt value UserAnswer = MsgBox("Voltage & OVP calibration. Connect the output to the DMM", vbYesNo + vbQuestion, "E3633A Calibration") If UserAnswer = vbNo Then ClosePort Exit Sub End If 3 Range("B4").Select ActiveCell.
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration ActiveCell.Value = "End Middle Current Calibration" StartCalibration CurrentMax, False, shunt 'Set output to maximum current cal ActiveCell.Value = "End Maximum Current Calibration" OVPandOCPCalibration False Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.Value = "Current Calibration Complete" Else ActiveCell.Value = Message ClosePort Exit Sub End If EnableOVPandOCP True SaveDate ActiveCell.
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration Private Function InitializeDevice() SendSCPI power, "*Cls" SendSCPI DMM, "*Rst" 'Set power-on condition for DMM SendSCPI power, "*Rst" 'Set power-on condition for power supply End Function Private Function CheckError(Error As Long, Message As String) As Boolean If Error < VI_SUCCESS Then ActiveCell.
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration Error = viWrite(device, ByVal commandString, Len(commandString), actual) If InStr(commandString, "?") Then Error = viRead(device, ByVal ReadBuffer, 512, actual) ReturnString = ReadBuffer crlfpos = InStr(ReturnString, Chr$(0)) If crlfpos Then ReturnString = Left(ReturnString, crlfpos - 2) End If SendSCPI = ReturnString End If End Function Private Function delay(delay_time As Single) Dim Finish As Single Finish = Timer + delay_ti
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration Private Function DacErrorCorrection() As Boolean Dim Message As String SendSCPI power, "Output On" 'Turn on the power supply output SendSCPI power, "Cal:Dac:Error" For I = 1 To 27 delay 1 ActiveCell.Value = "Waitting for " & Str$(27 - I) & "secs" Next I SendSCPI power, "Output Off" 'Turn off the power supply output Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration If bVolt Then 'Send the measured voltage value to the power supply SendSCPI power, "Cal:Volt:Data " & Str(DMMdata) Else 'Send the measured current value to the power supply SendSCPI power, "Cal:Curr:Data " & Str(DMMdata / shunt) End If SendSCPI power, "Output Off" 'Turn off the power supply output End Function Private Function OVPandOCPCalibration(bVolt As Boolean) SendSCPI power, "Output On" 'Turn on the power supply output If
Chapter 3 Calibration Procedures An Example program of Excel 97 for Calibration Declaration for Windows 95/NT 4.0 Declare Function viOpenDefaultRM Lib "visa32.dll" (instrumentHandle As Long) As Long Declare Function viOpen Lib "visa32.dll" (ByVal instrumentHandle As Long, _ ByVal viDesc As String, ByVal mode As Long, ByVal timeout As Long, _ vi As Long) As Long Declare Function viClose Lib "visa32.dll" (ByVal vi As Long) As Long Declare Function viWrite Lib "visa32.
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4 Theory of Operation
Theory of Operation This chapter provides block diagram level descriptions of the power supply. The descriptions provide a basic understanding of circuit operation and are intended as an aid in troubleshooting. It is assumed in the following discussions that you are familiar with the operating and programming instructions presented in the E3633A and E3634A User’s Guide.
Chapter 4 Theory of Operation Block Diagram Overview Block Diagram Overview This discussion pertains to the block diagram on the next page. The power supply’s circuitry is divided into two major blocks: the floating circuitry and the earth referenced circuitry. All power mesh and control circuits, display circuit, and digital circuits are contained in the floating circuitry. This circuitry also contains the power supply’s main controller.
Chapter 4 Theory of Operation Block Diagram Overview Block Diagram 88
Chapter 4 Theory of Operation AC Input and Bias Supplies AC Input and Bias Supplies The ac mains are connected by a fused power module. This module incorporates the functions of mains connection, fusing, and line voltage selection (100/115/230 Vac). The line voltage selection function of the module selects which primary winding of power transformer is energized. The transformer secondary windings are connected to the main pc board through connectors.
Chapter 4 Theory of Operation Floating Logic Floating Logic The floating common logic controls operation of the entire instrument. All output functions and bus command interpretation is performed in the main controller U19. The front panel and the earth referenced logic operate as slaves to U19. The floating common logic is comprised of the main controller U19, custom gate array U20, the program ROM U13, RAM U14, calibration EEPROM U15, and the 12 MHz clock oscillator.
Chapter 4 Theory of Operation Floating Logic M bits/second for the DAC system and 93.75 k bits/second for communication with the front panel controller. The general serial interface is a 3-bit interface as shown below. U20 Internal Signal Configuration Signals Front Panel Signals Serial Clock SERCK XFPSK Data OUT (send) SERDAT FPDI Data IN (receive) SERRBK FPDO Serial data is received simultaneously as serial data is clocked out.
Chapter 4 Theory of Operation D-to-A Converter D-to-A Converter All reference voltages of power circuits are derived from the internal voltage reference of system DAC U22. The system DAC track/hold amplifier outputs are used to provide controllable reference voltages to power circuits. The system DAC is programmed and responds to the main controller via internal 3-wire serial data bus SERCLK, SERRBK, and SERSTB. The system DAC is multiplexed to 6 track/hold amplifiers through U26.
Chapter 4 Theory of Operation A-to-D Converter A-to-D Converter The analog-to-digital converter (ADC) is used to change dc voltages into digital information. The circuitry consists of an integrator amplifier (U25 and U28), current steering switch U32, resistors (R72, R73, and R98), voltage reference U31, ADC controller U20, and residue ADC in U19. The ADC method used by the power supply is called multislope III. Multislope III is a charge balancing continuously integrating analog-to-digital converter.
Chapter 4 Theory of Operation Power Mesh and Control Power Mesh and Control For the power mesh and control circuit, the preregulator which is controlled by the phase control circuits is added ahead of the series pass transistor to minimize the power dissipated at the series pass transistor by controlling the dc level across the input filter capacitor, depending on the output voltage. For the dual range of output, a controlled transformer tap switching is used.
Chapter 4 Theory of Operation Power Mesh and Control Two error amplifiers are included in a CV/CC supply, one for controlling output voltage, the other for controlling output current.
Chapter 4 Theory of Operation Earth-Referenced Logic Earth-Referenced Logic Microprocessor U1 handles GPIB (IEEE-488) control through bus interface chip U6 and bus receiver/driver chips U3 and U11. The RS-232 interface is also controlled through microprocessor U1. RS-232 transceiver chip U19 provides the required level shifting to approximate ±9 volt logic levels through on-chip charge-pump power supplies using C3 and C9.
5 Service
Service This chapter discusses the procedures involved for returning a failed power supply to Agilent for service or repair.
Chapter 5 Service Operating Checklist 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 is depressed. Verify that the power-line fuse is installed: Use the 6.3 AT, 250 V fuse for 100 or 115 Vac operation. Use the 3.15 AT, 250 V fuse for 230 Vac operation. Verify the power-line voltage setting.
Chapter 5 Service Types of Service Available Types of Service Available If your power supply fails within 3 years of original purchase, Agilent Technologies Inc. will repair or replace it free of charge. If your unit fails after your 3-year 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.
Chapter 5 Service Repacking for Shipment Repacking for Shipment For the Express Exchange Service described on the previous page, return your failed Agilent E3633A or E3634A to the designated Agilent Service Center using the shipping carton of the exchange unit. A shipping label will be supplied. Agilent will notify you when your failed unit has been received.
Chapter 5 Service 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 volts. The following guidelines will help prevent ESD damage when serving the power supply or any electronic device. • Disassemble instruments only in a static-free work area. • Use a conductive work area to dissipate static charge.
Chapter 5 Service To Disconnect the Output Using an External Relay To Disconnect the Output Using an External Relay When the output of the power supply is turned off, it is implemented by setting the output to 0 volts and 0.02 amps. This gives a zero output voltage without actually disconnecting the output. 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.
Chapter 5 Service 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 instrument rather than any external connections. Also make sure that the instrument is accurately calibrated. The power supply’s circuits allow troubleshooting and repair with basic equipment such as a digital multimeter and a 100 MHz oscilloscope.
Chapter 5 Service Troubleshooting Hints 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 bias supplies as tabulated below. Table 5-1. Bias Supplies Voltages Bias Supply Minimum Maximum Check At +5 V Floating +4.75 V +5.25 V U10 pin 2 -5.1 V Floating -4.75 V -5.
Chapter 5 Service 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. The power-on self-test performs checks 601 through 604 and 624 through 632. For serial MY53xx6xxx, the power-on self-test utilizes the complete self-test, which covers error codes 601 through 632.
Chapter 5 Service Self-Test Procedures 606 Rundown gain out of range This test checks the nominal gain between the integrating ADC and the U19 on-chip ADC. The nominal gain is checked to ±10% tolerance. 607 Rundown too noisy This test checks the gain repeatability between the integrating ADC and the U19 on-chip ADC. The gain test (606) is performed eight times. Gain noise must be less that ±64 lsb’s of the U19 on-chip ADC.
Chapter 5 Service Self-Test Procedures 632 Hardware test failed This test checks the status of voltage and current error amplifiers for the power circuit. If both amplifiers are not operational, the power supply will beep and the error annunciator will be on.
6 Component Drawings
Component Drawings This chapter contains component locator drawings for the power supply. The block diagram is also shown in chapter 4.
Chapter 6 Component Drawings E3633-60002/E3634-60002 Component locator for the main board E3633-60002/E3634-60002 Component locator for the main board 6 111
Chapter 6 Component Drawings E3633-60003 Component locator for the front panel E3633-60003 Component locator for the front panel 112
Chapter 6 Component Drawings E3633-60019/E3634-60019 Component locator for the main board (serial MY53xx6xxx) 9 0 C416 C535 C534 MOV503 R550 U502 MOV502 R531 R726 C714 C508 R722 T508 C538 T502 C537 JP303 C531 R549 R554 MOV504 CR6011 2 R528 3 R545 MOV501 C513 Q601 R512 C509 R547 C533 2 1 R413 R410 3 CR404 C408 C409 C805 C415 R409 3 R806 3 R408 C536 6 R548 2 R411 2 2 U503 U402 U401 1 JP802 (BLK) 1 C902 R610 CR512 E4 C401 C540 D401 3 U901 C603 C528 R541 R
Chapter 6 Component Drawings Component locator for the front panel (serial MY53xx6xxx) Component locator for the front panel (serial MY53xx6xxx) 114
Copyright© 1998–2014 Agilent Technologies All Rights Reserved. Printing History Seventh Edition, April 21, 2014 New editions are complete revisions of the manual. Update packages, which are issued between editions, may contain additional information and replacement pages which you merge into the manual. The dates on this page change only when a new edition is published. Certification Agilent Technologies certifies that this product met its published specifications at the time of shipment.
Regulatory Markings The CE marking is a legal compliance marking of the European Community. This CE marking 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.
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