Agilent N8900 Series Autoranging System DC Power Supply Operating and Service Guide
Agilent N8900 Series Autoranging System DC Power Supply Operating and Service Guide This document includes user,service, and programming information for the Agilent N8900 Series Autoranging System DC Power Supply. If you have feedback on this document, please contact Agilent at www.agilent.com/find/n8900docfeedback.
Service Information Performance Verification Calibration Procedure Contact Agilent Technologies You can contact Agilent Technologies for warranty, service, or technical support. l In the United States: (800) 829-4444 l In Europe: 31 20 547 2111 l In Japan: 0120-421-345 Use www.agilent.com/find/assist for information on contacting Agilent worldwide, or contact your Agilent Technologies Representative. Version 2 , updated -XQH 2014 © Copyright Agilent Technologies, Inc.
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Legal and Safety Information Note the instrument's external markings described under "Safety Symbols". Only operate the product at the rated mains voltage and phase as stipulated on the input label. Ground the Instrument This product is provided with protective earth terminals. To minimize shock hazard, the instrument must be connected to the AC mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet.
Legal and Safety Information A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met. Safety Symbols Direct current Alternating current Frame or chassis terminal Standby supply. Unit is not completely disconnected from AC mains when switch is off.
Legal and Safety Information Contains one or more of the 6 hazardous substances above the maximum concentration value (MCV), 40 Year EPUP. ISM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group 1 Class A product (CISPER 11, Clause 4). ICES/NMB001 This text indicates product compliance with the Canadian Interference- Causing Equipment Standard (ICES-001).
Models and Options Models and Options Model Ratings 5 kW Models Voltage Current AC mains Agilent N8920A Agilent N8921A Agilent N8923A Agilent N8924A 80 V 200 V 500 V 750 V 170 A 70 A 30 A 20 A 208 VAC 208 VAC 208 VAC 208 VAC Agilent N8940A Agilent N8941A Agilent N8943A Agilent N8944A 80 V 200 V 500 V 750 V 170 A 70 A 30 A 20 A 400 VAC 400 VAC 400 VAC 400 VAC 10 kW Models Voltage Current AC mains Agilent N8925A Agilent N8926A Agilent N8928A Agilent N8929A Agilent N8930A 80 V 200 V 500 V 750
Specifications and Characteristics Specifications and Characteristics Specifications Supplemental Characteristics Common Characteristics Autoranging Characteristics Dimension Diagrams Unless otherwise noted, specifications are warranted over the ambient temperature range of 0°C to 45°C after a 30minute warm-up period. Specifications apply from >2% to 100% of the rated voltage and from >1% to 100% of the rated current, measured at the output terminals with local sensing (sense terminals not connected).
Specifications and Characteristics N8925A/ N8945A N8926A/ N8946A N8928A/ N8948A N8929A/ N8949A N8930A/ N8950A DC Ratings Voltage: Current: Power: 0 - 80 V 0 - 340 A 10 kW 0 - 200 V 0 - 140 A 10 kW 0 - 500 V 0 - 60 A 10 kW 0 - 750 V 0 - 40 A 10 kW 0 - 1000 V 0 - 30 A 10 kW Output ripple & noise1 CV rms: CV peak-to-peak: 25 mV 320 mV 40 mV 375 mV/300 mV 70 mV 350 mV 200 mV 800 mV 350 mV 1600 mV Load regulation Voltage: Current: 40 mV 510 mA 100 mV 210 mA 250 mV 90 mA 375 mV 60 mA 500 mV
Specifications and Characteristics Supplemental Characteristics (typical) N8920A/ N8940A N8921A/ N8941A N8923A/ N8943A N8924A/ N8944A 0 to 81.6 V 0 to 173.4 A 0 to 204 V 0 to 71.4 A 0 to 510 V 0 to 30.6 A 0 to 765 V 0 to 20.4 A Programming and Measurement Resolution Voltage: Current: 4 mV 7 mA 9 mV 3 mA 21 mV 2 mA 31 mV 1 mA Temperature Coefficient1 Voltage: Current: 4 mV 8.5 mA 10 mV 3.5 mA 25 mV 1.5 mA 37.
Specifications and Characteristics Supplemental Characteristics (typical) N8925A/ N8945A N8926A/ N8946A N8928A/ N8948A N8929A/ N8949A N8930A/ N8950A 0 to 81.6 V 0 to 346.8 A 0 to 204 V 0 to 142.8 A 0 to 510 V 0 to 61.2 A 0 to 765 V 0 to 40.8 A 0 to 1020 V 0 to 30.6 A Programming and Measurement Resolution Voltage: Current: 4 mV 14 mA 9 mV 6 mA 21 mV 3 mA 31 mV 2 mA 41 mV 2 mA Temperature Coefficient1 Voltage: Current: 4 mV 17 mA 10 mV 7 mA 25 mV 3 mA 37.5 mV 2 mA 50 mV 1.
Specifications and Characteristics Supplemental Characteristics (typical) N8931A/ N8951A N8932A/ N8952A N8934A/ N8954A N8935A/ N8955A N8937A/ N8957A 0 to 81.6 V 0 to 520.2 A 0 to 204 V 0 to 214.2 A 0 to 510 V 0 to 91.8 A 0 to 765 V 0 to 61.2 A 0 to 1530 V 0 to 30.6 A Programming and Measurement Resolution Voltage: Current: 4 mV 21 mA 9 mV 9 mA 21 mV 4 mA 31 mV 3 mA 61 mV 2 mA Temperature Coefficient1 Voltage: Current: 4 mV 25.5 mA 10 mV 10.5 mA 25 mV 4.5 mA 37.5 mV 3 mA 75 mV 1.
Specifications and Characteristics Common Characteristics Characteristic All Models Command Response Time: < 25 ms Savable States: 10 Analog Programming Input range: Accuracy: Input impedance: 0 to 5 V or 0 to 10 V (selectable) Specified instrument accuracy ±0.2% of rating 150 kΩ (referenced to ground) Computer Interfaces LXI Core 2011: USB: GPIB: Language: 10/100 Base-T Ethernet (Sockets, VXI-11 protocol, Web user interface) USB 2.0 (USB-TMC488) GPIB IEEE 488 SCPI - 1993, IEEE 488.
Specifications and Characteristics Autoranging Characteristics 5 kW Models N8920A N8940A N8921A N8941A N8923A N8943A N8924A N8944A V1 80 V 200 V 500 V 750 V I1 62.5 A 25 A 10 A 6.667 A V2 29.4 V 71.43 V 166.67 V 250 V I2 170 A 70 A 30 A 20 A 10 kW Models N8925A N8945A N8926A N8946A N8928A N8948A N8929A N8949A V1 80 V 200 V 500 V 750 V 1000 V I1 125 A 50 A 20 A 13.33 A 10 A V2 29.4 V 71.43 V 166.67 V 250 V 333.
Specifications and Characteristics Dimension Diagrams 16 Agilent N8900 Series Operating and Service Guide
Operating Information Operating Information Introduction to the Instrument Installing the Instrument Getting Started Using the Power Supply Agilent N8900 Series Operating and Service Guide 17
Introduction to the Instrument Introduction to the Instrument Agilent N8900 Series at a Glance Front Panel at a Glance Front Panel Display at a Glance Front Panel Keys at a Glance Rear Panel at a Glance The Agilent N8900 Series is a family of autoranging system DC power supplies with performance and features that are optimized for automated test systems. They are available in power levels of 5 kW, 10 kW, and 15 kW. Voltage levels range from 80 to 1500 V. Current levels range from 20 to 510 A.
Introduction to the Instrument Front Panel at a Glance Front Panel Display at a Glance Output voltage and current Displays the actual output voltage and current.
Introduction to the Instrument Voltage and Current settings Displays the programmed voltage and current settings. Interface status Indicates the following remote interface activity: Err = an error has occurred (press Error key to display error message) Lan = the LAN is connected and has been configured IO = there is activity on one of the remote interfaces Front Panel Keys at a Glance The AC line switch turns the unit on or off (off = 0). The indicator above the On/Off switch shows the display status.
Introduction to the Instrument The numeric entry keys do the following: The 0 through 9 keys enter numbers. The (.) key is the decimal point. The – key is used to enter a minus sign. The up/down arrow keys increment or decrement voltage or current settings. They also select letters in alphabetic entry fields. The E key enters an exponent. Add the value to the right of the E. The back arrow key deletes digits as it backspaces over them. The Enter key enters a value.
Front Panel Menu Front Panel Menu This is an overview of the front-panel menus. Press the Menu key to access the front panel menus. For a brief tutorial on how to navigate the front panel menu, refer to Use the front panel menu.
Front Panel Menu 1st Menu Level System 2nd Level Group 3rd & 4th Levels Description Function Defines the function of each unit in the paralleled group Master Displays the configured slave addresses Slave Specifies the slave address Preferences Display Configures the screen saver and wake on IO timer Admin Login/Logout Enter a password to access the Admin functions Cal Displays calibration commands Voltage Calibrates voltage programming and measurement Current Calibrates current programm
Installing the Instrument Installing the Instrument Before Installation or Use AC Mains Connections Single Unit Connections Multiple Unit Connections Analog Port Connections Interface Connections 24 Agilent N8900 Series Operating and Service Guide
Before Installation or Use Before Installation or Use Inspect the Unit When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and nearest Agilent Sales and Support Office immediately. Refer to www.agilent.com/find/assist. Until you have checked out the power supply, save the shipping carton and packing materials in case the unit has to be returned.
Before Installation or Use Provide Adequate Air Flow Do not block the air intake at the front, or the exhaust at the rear of the unit. The dimensions of your power supply, an outline diagram, and airflow direction are given under Dimension Diagrams. Fans cool the power supply by drawing air through the front and exhausting it out the back. Allows at least 8 inches (20 cm) of space at the front and back of the unit for adequate air circulation.
AC Mains Connections AC Mains Connections Phase Balancing with Multiple Units Power Cables AC Mains Phase Distribution SHOCK HAZARD The instrument requires a chassis ground connection through a separate conductor. Be certain that the AC mains includes an earth ground connection. AC mains connections must be made by a qualified electrician who is knowledgeable about 3-phase mains circuits and all applicable safety standards and requirements.
AC Mains Connections 208 VAC, 3-phase 5 kW units only 208 VAC, 3-phase 10 kW units only 208 VAC, 3-phase 15 kW units only Note that either delta-type or Y-type AC mains distribution can be used, provided that the correct line-to-line voltage is applied. Phase Balancing with Multiple Units The previous figures illustrate the phase current distribution. The N8900 power supplies can have from one to three internal 5.
AC Mains Connections 5 kW, 208 VAC and 400 VAC, phase balancing scheme 10 kW, 208 VAC and 400 VAC, phase balancing scheme Power Cables An AC mains power cable is not provided with the unit. Refer to the following table for the maximum current capacity requirements for each cable conductor. If required by local electrical codes, install a fuse or circuit breaker between the ac mains and the unit. Refer to the following table for current ratings. Keep the AC mains cables as short as possible.
AC Mains Connections Power Connector Remove the strain relief to access the connector plug. Connect the AC mains cable to the connector plug as shown in the following illustrations. Insert the cable wires into the connector plug. On 400 VAC connectors, insert a flat blade screwdriver to release the internal wire clamp. On 208 VAC connectors, turn the screw to open or close the clamp. Tighten all wires securely. The safety ground wire must be green. Other colors are for illustration purposes.
Single Unit Connections Single Unit Connections Single Load Connections Multiple Load Connections Remote Sense Connections Positive and Negative Voltages Output Connections SHOCK HAZARD Turn off AC power before making rear panel connections.
Single Unit Connections AWG Nearest Metric size Ampacity (Note1) Resistance (Note2) 12 4 mm2 up to 30 A 1.59 10 6 mm2 up to 40 A 1.0 8 10 mm2 up to 60 A 0.63 6 16 mm2 up to 80 A 0.395 2 35 mm2 up to 140 A 0.156 1/0 50 mm2 up to 195 A 0.098 2/0 70 mm2 up to 225 A 0.078 3/0 95 mm2 up to 260 A 0.062 4/0 120 mm2 up to 300 A 0.049 Note 1. Ampacity is based on a single conductor in free air, 26-30 °C ambient temperature, with the conductor rated at 60 °C.
Single Unit Connections Use the M8 diameter bolts, nuts, ring lugs, and washers - for models rated under 500 V. Maximum torque: 12.4 Nm (9.2 lb-ft). Use the M6 diameter bolts, nuts, ring lugs, and washers - for models rated 500 V and up. Maximum torque: 7.3 Nm (5.4 lb-ft). Route the load leads through the safety cover before attaching the safety cover to the rear panel. The following figures illustrate the two types of safety covers installed. Large safety cover - for all models.
Single Unit Connections Remote Sense Connections When the sense leads are not connected to the load, the power supply will internally sense the voltage at the output terminals (referred to as local sensing), which regulates the output voltage at the output terminals. This does not compensate for the load lead voltage drop. Remote sensing improves the voltage regulation at the load by monitoring the voltage at the load rather than at the output terminals.
Single Unit Connections Over-voltage Protection Remote over-voltage protection (OVP) provides a customer-configurable over-voltage protection. When combined with remote voltage sensing, this allows for more precise voltage protection directly at the load. The OVP circuit monitors the voltage at the + and – sense terminals if they are connected to the load, or at the output terminals if the sense terminals are not being used. Refer to Programming Output Protection for further information.
Multiple Unit Connections Multiple Unit Connections Parallel Connections Share Connections Group Connections Series Connections SHOCK HAZARD Turn off AC power before making rear panel connections. HAZARDOUS VOLTAGES All models generate voltages in excess of 60 VDC, with some models rated at up to 1,500 VDC! Ensure that all instrument connections, load wiring, and load connections are either insulated or covered so that no accidental contact with lethal output voltages can occur.
Multiple Unit Connections Agilent N8900 Series Operating and Service Guide 37
Multiple Unit Connections Share Connections The Share terminals must be connected for parallel operation as shown in the figure above. For further information about current sharing, refer to Current Share Operation. The following figures details the Share bus connections for multiple units. Group Connections A Group or master/slave configuration can also be used when connecting units in parallel as shown in the figure.
Analog Port Connections Analog Port Connections Analog connections are made through the 15 pin analog connector (Type: Sub-D, D-Sub) on the rear of the unit. Use a standard connector plug (customer-supplied) to make all connections. Remember to turn of the unit before making any rear panel connections. Equipment DamageThe analog interface is galvanically separated from DC output and referenced to earth ground. Therefore never connect a ground from the analog interface to the +DC or -DC outputs.
Interface Connections Interface Connections GPIB Connections USB Connections LAN Connections - site and private This section describes how to connect to the various communication interfaces on your power supply. For further information about configuring the remote interfaces, refer to Remote Interface Configuration. If you have not already done so, install the Agilent IO Libraries Suite, which can be found at www.agilent.com/find/iolib .
Interface Connections 2. With the Connection Expert utility of the Agilent IO Libraries Suite running, the computer will automatically recognize the instrument. This may take several seconds. When the instrument is recognized, your computer will display the VISA alias, IDN string, and VISA address. This information is located in the USB folder. 3.
Getting Started Getting Started Turn the Unit On Set the Output Voltage Set the Output Current Set the Over-Voltage Protection Enable the Output Use the Built-in Help System Turn the Unit On Verify that the line cord is connected and plugged in to the correct AC line voltage. Turn the unit on with the front panel power switch. Rotate the knob from 0 to 1. The front panel display will light up after a few seconds. A power-on self-test occurs automatically when you turn the unit on.
Getting Started Method 2 Use the left and right navigation keys to navigate to the setting that you wish to change. In the following display, the voltage setting is selected. Enter a value using the numeric keypad. Then press Select. You can also use the numeric arrow keys to adjust the value up or down. Values become effective when the output is enabled. Method 3 Use the Voltage key to select the voltage entry field. In the display below, the voltage setting is selected.
Getting Started Method 2 Use the left and right navigation keys to navigate to the setting that you wish to change. In the display below, the current setting is selected. Enter a value using the numeric keypad. Then press Select. You can also use the numeric arrow keys to adjust the value up or down. Values become effective when the output is turned on. Method 3 Use the Current key to select the current entry field. In the display below, the current setting is selected.
Getting Started l To exit the command menu press the Meter key to immediately return to meter mode, or press the Menu key to return to the top level. For a map of the front panel menu commands, refer to Front Panel Menu Reference. Menu example - accessing over-voltage protection. Press the Menu key to access the front panel command menu. The first line identifies the menu path. When the menu is first accessed, the menu is at the top or root, and the path is empty.
Getting Started Enable the Output HAZARDOUS VOLTAGES All models generate voltages in excess of 60 VDC, with some models rated at up to 1,500 VDC! Ensure that all instrument connections, load wiring, and load connections are either insulated or covered so that no accidental contact with lethal output voltages can occur. Use the On/Off key to enable the output. If a load is connected to the output, the front panel display will indicate that it is drawing current. Otherwise, the current reading will be zero.
Remote Interface Configuration Remote Interface Configuration USB Configuration GPIB Configuration LAN Configuration Modifying the LAN Settings Using the Web Interface Using Telnet Using Sockets Interface Lockout Introduction This instrument supports remote interface communication over three interfaces: GPIB, USB, and LAN. All three interfaces are "live" at power up. To use the interfaces, you must first install the Agilent IO Libraries software, found at www.agilent.com/find/iolib .
Remote Interface Configuration LAN Configuration The following sections describe the primary LAN configuration functions on the front-panel menus. Note that there are no SCPI commands to configure the LAN parameters. All LAN configuration must be done from the front panel. After changing the LAN settings, you must Save the changes. Select: System\IO\LAN\Apply. Selecting Apply activates the settings. LAN settings are non-volatile, they will not be changed by power cycling or *RST.
Remote Interface Configuration Modifying the LAN Settings IP Address Select IP to configure the addressing of the instrument. Press the Menu key, then select System\IO\LAN\Config\IP. The configurable parameters include: Front Panel Menu Select System\IO\LAN\Modify\IP SCPI Command Not available Select Auto or Manual. See below for a full description. l Auto - automatically configures the addressing of the instrument. When selected, the instrument will first try to obtain an IP address from a DHCP server.
Remote Interface Configuration Front Panel Menu SCPI Command Select System\IO\LAN\Modify\Name Not available You can enter any value from the numeric keypad. For additional characters, use the up/down navigation keys to enter an alpha character by scrolling through the selection list that appears when you press the keys. Use the backspace key to delete a value. Press Enter when you are finished. Host Name - This field registers the supplied name with the selected naming service.
Remote Interface Configuration mDNS Service Name The mDNS service name is registered with the selected naming service. To configure the mDNS service name of the instrument: Front Panel Menu Select System\IO\LAN\Modify\mDNS SCPI Command Not available You can enter any value from the numeric keypad. For additional characters, use the up/down navigation keys to enter an alpha character by scrolling through the selection list that appears when you press the keys. Use the backspace key to delete a value.
Remote Interface Configuration The Web interface is enabled when shipped. To launch the Web interface: 1. Open the Web browser on your computer. 2. Enter the instrument’s hostname or IP address into the browser’s Address field. The following home page will appear. 3. Click on the Browser Web Control button in the navigation bar on the left to begin controlling your instrument. 4. For additional help about any of the pages, click on the Help with this Page button.
Remote Interface Configuration Using Sockets Power supplies allow any combination of up to six simultaneous data socket, control socket, and telnet connections to be made. Agilent instruments have standardized on using port 5025 for SCPI socket services. A data socket on this port can be used to send and receive ASCII/SCPI commands, queries, and query responses. All commands must be terminated with a newline for the message to be parsed. All query responses will also be terminated with a newline.
Using the Power Supply Using the Power Supply This section contains details on using the instrument, including front panel and remote interface operation. You may want to read Front-Panel Menu Reference first. See SCPI Programming Reference for details on the SCPI commands to program the instrument.
Programming the Output Programming the Output When the power supply is first turned on, it may take about 30 seconds or so to initialize the unit before it is ready for use. Set the Output Voltage Set the Output Current Enable the Output Set the Output Voltage You can set the output voltage when the output is either disabled (OFF) or enabled (ON). When enabled, the output voltage will rise to the programmed setting.
Programming Output Protection Programming Output Protection Set the Over-Voltage Protection Set the Over-Current Protection Clear Output Protection The Agilent N8900 series power supplies have many protection functions. A front panel status indicator will turn on when a protection function has been set. Most protection functions are latching, which means that they must be cleared once they have been set. Of the following protection functions, only the OV and OC are user-programmable.
Programming Output Protection You can also specify an OCP delay to prevent momentary output settings, load, and status changes from tripping the over-current protection. In most cases these momentary conditions would not be considered an over-current protection fault, and having an OCP condition disable the output when they occur would be a nuisance. Specifying an OCP delay lets the OCP circuit ignore these momentary changes during the specified delay period.
Programming Output Steps Programming Output Steps The transient system of the Agilent N8900 HPS lets you generate output steps. An output step is a one-time event that steps the output voltage or current up or down in response to a trigger.
Programming Output Steps Front Panel Menu Select Transient\Control. Scroll to Initiate. Then press Select. SCPI Command To initiate the transient trigger system: INIT:TRAN It takes a few milliseconds for the instrument to be ready to receive a trigger signal after receiving the INITiate:TRANsient command. If a trigger occurs before the trigger system is ready for it, the trigger will be ignored.
Making Measurements Making Measurements The Agilent N8900 series has fully integrated voltmeter and ammeter to measure the actual voltage and current that is being supplied to the load. Whenever the instrument is on, the front panel automatically measures output voltage and current. Power measurements are derived from the voltage and current measurements. Average (DC) Measurements Use the following commands to make a measurement: Front Panel Select the Meter key.
Parallel Operation Parallel Operation Current Share Operation Group Operation Group Configuration Group Protection Parallel operation provides the possibility of connecting a number of devices together to create a system with higher total current and, hence, higher power. Refer to Parallel Connections for detailed information on how to connect the outputs, share cables, and master/slave cables.
Parallel Operation Group Configuration To configure the units in a paralleled group: Configure the Unit as either a Master or Slave The current SHARE cables must first be connected on all paralleled units as previously described under Paralleled Connections. The units at the end of the grouped connection chain must be terminated by setting the DIP switch located on the rear panel (see Parallel Connections). Turn the outputs of all paralleled units off.
Parallel Operation Front Panel Menu Select System\Group\Master SCPI Command Not available The Configured field displays the addresses of all connected and configured Slave units. If the Configured field is blank, press Discover Slaves to discover and display the addresses of the connected units.
Analog Programming Analog Programming Specify the Analog Reference Voltage Enable the Analog Interface Program the Analog Functions Pin Descriptions and Characteristics The analog interface on the rear of the instrument provides the following capability: l Remote control of output voltage and current l Remote monitoring of OT, OVP, and CV status.
Analog Programming Program the Analog Functions Equipment Damage The digital and analog ground pins are internally connected to the USB and GPIB grounds.Only connect these pins to external circuitry that is either at earth ground potential or, to avoid ground loops, float the connections. Output Off control The INHIBIT input (pin 13) can be used in analog control to switch the output off (and on).
Analog Programming Output current and voltage control using external potentiometers Analog remote control of the output can be accomplished by connecting external potentiometers to the VPROG and IPROG pins as shown. This is similar to the function of the front panel voltage and current knobs. The potentiometers must be rated at 10 kΩ. Connect the VREF pin to one end of the potentiometers. Connect the wipers to the VPROG and IPROG pins.
Analog Programming Pin Descriptions and Characteristics Pin Descriptions Pin Name Type Description 1 VPROG Analog in Programs output voltage. Only active when A-ENAB is low. 2 IPROG Analog in Programs output current. Only active when A-ENAB is low. 3 VREF Analog out Reference voltage. Can be connected to VPROG or IPROG directly to program full scale, or through potentiometers to adjust programmed values. 4 DGND Ground Ground for digital inputs and outputs.
System-Related Operations System-Related Operations Instrument Identification Instrument State Storage Front Panel Display Password Protection Instrument Identification You can query the model number, serial number, options, and firmware revision. SCPI commands let you return information with the *IDN? and *OPT? queries. Front Panel Menu Select System\About\Frame.
System-Related Operations Front Panel Display The power supply has a front panel screen saver that significantly increases the life of the LCD display by turning it off during periods of inactivity. The delay can be set from 30 to 999 minutes in 1 minute increments. As shipped from the factory, the screen saver comes on one hour after activity on the front panel or interface has ceased.
Operating Mode Tutorial Operating Mode Tutorial Voltage Regulation Current Regulation Power Regulation Voltage Regulation Voltage regulation is also known as constant voltage mode (CV). In CV mode, the DC output voltage of the power supply is held constant at its voltage setting, unless the output current or the output power reaches the current limit setting or the power limit. In both cases the device will automatically change to constant current (CC) or constant power (CP) operation.
Operating Mode Tutorial Current Regulation Current regulation is also known as current limiting or constant current mode (CC). In CC mode, the DC output current is held constant by the power supply when the output current reaches the current limit setting. The power supply then switches from CV to CC mode. If, however, the power consumption reaches the set maximum power value, the device will switch automatically to power limit (CP) where Vout X Iout = Plimit.
SCPI Programming Reference SCPI Programming Reference Introduction to the SCPI Language Commands by Subsystem Command Quick Reference Reset State (*RST) SCPI Error Messages Compatibility Commands Related Information IO Libraries and Instrument Drivers The Agilent IO Libraries Suite software is provided on the Agilent Automation Ready CD-ROM provided with your instrument. Installation instructions are provided on the CD-ROM.
Introduction to the SCPI Language Introduction to the SCPI Language Keywords Queries Command Separators and Terminators Syntax Conventions Parameter Types Device Clear Introduction This instrument complies with the rules and conventions of the present SCPI version (see SYSTem:VERSion?). SCPI (Standard Commands for Programmable Instruments) is an ASCII-based instrument command language designed for test and measurement instruments. SCPI has two types of commands, common and subsystem. IEEE-488.
Introduction to the SCPI Language The command syntax shows most commands (and some parameters) as a mixture of upper- and lower-case letters. The upper-case letters indicate the abbreviated spelling for the command. For shorter program lines, you can send the abbreviated form. For better program readability, you can send the long form. In the above examples, OUTP and OUTPUT are both acceptable forms. You can use upper- or lower-case letters. Therefore, OUTPUT, outp, and Outp are all acceptable.
Introduction to the SCPI Language OUTPut:PROTection:CLEar;:STATus:OPERation:CONDition? Note the use of the colon after the semicolon in order to return the command parser to the root. Terminators A command string sent to the instrument must terminate with a new line () character. The IEEE-488 EOI (EndOr-Identify) message is interpreted as a character and can be used to terminate a command string in place of an . A carriage return followed by a new line () is also accepted.
Introduction to the SCPI Language ters. Query responses will always return the short form in all upper-case letters. The following command requires a discrete parameter for the display settings: VOLTage:MODE FIXed|STEP Boolean Parameters Boolean parameters represent a single binary condition that is either true or false. For a false condition, the instrument will accept "OFF" or "0". For a true condition, the instrument will accept "ON" or "1".
Commands by Subsystem Commands by Subsystem Subsystem CALibrate DISPlay MEASure OUTPut [SOURce:] CURRent VOLTage STATus SYSTem TRIGger Additional Commands Compatibility Agilent N8900 Series Operating and Service Guide 77
Calibrate Commands Calibrate Commands Calibrate commands calibrate the instrument. Read the calibration section before calibrating. Improper calibration can reduce accuracy and reliability. CALibrate:COUNt? Returns the number of times the unit has been calibrated. The count is incremented whenever the calibration (including the date) is saved, the administration password is changed, the administration password is reset using the internal cal switch, or the instrument firmware is updated.
Calibrate Commands Parameter Typical Return <"date">String program data. Enclose string parameters in single or double quotes. Date of last calibration Enters the calibration date: CAL:DATE "12/12/12" CALibrate:LEVel P1|P2|P3|P4 CALibrate:LEVel? Advances to the next level in the calibration. P1 is the first level; P2 the second, P3 the third, and P4 the fourth.
Calibrate Commands CALibrate:STATe 0|OFF|1|ON [,] CALibrate:STATe? Enables or disables calibration mode. Calibration mode must be enabled for the instrument to accept any calibration commands. The first parameter specifies the state. The second optional parameter is the password.
DISPlay/LXI Commands DISPlay/LXI Commands DISPlay[:WINDow][:STATe] 0|OFF|1|ON DISPlay[:WINDow][:STATe]? Turns the front panel display on or off. Parameter 0|OFF|1|ON, *RST ON Typical Return 0 or 1 Turns the front panel display off: DISP OFF LXI:IDENtify[:STATe] 0|OFF|1|ON LXI:IDENtify[:STATe]? Turns the front panel LXI identify indicator on or off. When turned on, the "LAN" status indicator on the front panel blinks on and off to identify the instrument that is being addressed.
MEASure Commands MEASure Commands Measure commands measure the output voltage, current, or power. They trigger the acquisition of new data before returning the reading. MEASure[:SCALar]:CURRent[:DC]? MEASure[:SCALar]:POWer[:DC]? MEASure[:SCALar]:VOLTage[:DC]? Initiates and triggers a measurement. Returns the averaged output measurement. Values returned are either in amperes, volts, or watts.
OUTPut Commands OUTPut Commands Output commands control the output, power-on, and protection clear functions. OUTPut[:STATe] 0|OFF|1|ON OUTPut[:STATe]? Enables or disables the output. The state of a disabled output is a condition of zero output voltage and zero current. Parameter 0|OFF|1|ON , *RST OFF Typical Return 0 or 1 Turns the output off: OUTP OFF l When the output is enabled, the instrument status changes from OFF to the operating status (CV, CC, etc.).
[SOURce] Commands [SOURce] Commands The SOURce keyword is optional in the following CURRent and VOLTage commands [SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude] |MIN|MAX [SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude] |MIN|MAX [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX] Sets the immediate current level and the triggered current level when the output is operating in constant current mode.
[SOURce] Commands [SOURce:]CURRent:PROTection:STATe 0|OFF|1|ON [SOURce:]CURRent:PROTection:STATe? Enables or disables the over-current protection. If the over-current protection function is enabled and the output goes into constant current operation, the output is disabled and the Questionable Condition status register OCP bit is set.
[SOURce] Commands [SOURce:]VOLTage:PROTection[:LEVel] |MIN|MAX [SOURce:]VOLTage:PROTection[:LEVel]? [MIN|MAX] Sets the over-voltage protection level. Units are in volts. If the output voltage exceeds the OVP level, the output is disabled and the Questionable Condition status register OV bit is set.
STATus Commands STATus Commands Status commands let you determine the operating condition of the instrument at any time. The instrument has three groups of status registers; Operation, Questionable, and Standard Event. The Operation and Questionable status groups each consist of the Condition, Enable, and Event registers as well as NTR and PTR filters. Instrument status is also programmed using the Common commands: *CLS, *ESE, *ESR?, *OPC, *OPC?, *SRE, *STB? and *WAI discussed at the end of this topic.
STATus Commands l *CLS does not clear the enable register, but does clear the event register. STATus:OPERation:NTRansition STATus:OPERation:NTRansition? STATus:OPERation:PTRansition STATus:OPERation:PTRansition? Sets and queries the value of the NTR (Negative-Transition) and PTR (Positive-Transition) registers. These registers serve as a polarity filter between the Operation Condition and Operation Event registers.
STATus Commands STATus:QUEStionable[:EVENt]? Queries the event register for the Questionable Status group. This is a read-only register, which stores (latches) all events that are passed by the Operation NTR and PTR filter. Reading the Questionable Status Event register clears it. Parameter (none) Typical Return Read questionable status event register: STAT:QUES? l *RST has no effect on this register. l The value returned is the binary-weighted sum of all bits set in the register.
STATus Commands STATus:QUEStionable:NTRansition STATus:QUEStionable:NTRansition? STATus:QUEStionable:PTRansition STATus:QUEStionable:PTRansition? Sets and queries the value of the NTR (Negative-Transition) and PTR (Positive-Transition) registers. These registers serve as a polarity filter between the Questionable Condition and Questionable Event registers.
STATus Commands Parameter Typical Return A decimal value that corresponds to the binaryweighted sum of the bits in the register. Enable bit 3 and 4 in the enable register: *ESE 24 l Any or all conditions can be reported to the ESB bit through the enable register. To set the enable register mask, write a decimal value to the register using *ESE. l *CLS does not clear the enable register, but does clear the event register.
STATus Commands *OPC? Returns a 1 to the output buffer when all pending operations complete. The response is delayed until all pending operations complete. Parameter (none) Typical Return 1 Return a 1 when commands complete: *OPC? l The purpose of this command is to synchronize your application with the instrument. l Other commands cannot be executed until this command completes. *SRE *SRE? Service Request Enable Command and Query. Sets the value of the Service Request Enable register.
STATus Commands *WAI Pauses additional command processing until all pending operations are complete. See OPC for more information. Parameter (none) Typical Return (none) Wait until all pending operations complete.*WAI l *WAI can only be aborted by sending the instrument a Device Clear command.
SYSTem Commands SYSTem Commands System commands control system functions that are not directly related to output control, measurement, or status functions. System functions are also controlled using the Common commands: *IDN?, *LRN?, *OPT?, *RCL, *RST, *SAV, and *TST? discussed at the end of this topic. SYSTem:COMMunicate:LAN:CONTrol? SYSTem:COMMunicate:TCPip:CONTrol? Returns the initial socket control connection port number. This connection is used to send and receive commands and queries.
SYSTem Commands l The front-panel ERR annunciator turns on when one or more errors are currently stored in the error queue. Error retrieval is first-in-first-out (FIFO), and errors are cleared as you read them. When you have read all errors from the error queue, the ERR annunciator turns off. l If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with 350,"Error queue overflow".
SYSTem Commands *LRN? Returns a sequence of SCPI commands that can later be used to put the instrument in the same state that it was in when the *LRN? query was sent. The scope of the returned settings is the same as for the *SAV and *RCL commands. Parameter (none) Typical Return ASCII string with semicolon-separated fields Returns the sequence of SCPI commands: *LRN? l To read the string into your computer, be sure to dimension a string variable with at least 2500 characters.
SYSTem Commands Parameter (none) Typical Return (none) Reset the instrument: *RST l *RST forces the ABORt command. This cancels any trigger actions presently in process, and resets the WTG bit in the Status Operation Condition register. *SAV <0-9> Saves the present state of the instrument to one of ten non-volatile memory locations. Parameter 0 -9 Typical Return (none) Save state to location 1: *SAV 1 l If a particular state is desired at power-on, it should be stored in location 0.
Trigger Commands Trigger Commands Trigger commands control the remote triggering of the instrument's output. Abort commands abort any pending triggers. Initiate commands initiate the transient trigger system. ABORt:TRANsient Cancels any triggered actions. It returns the trigger system back to the Idle state and resets the WTG-tran bit in the Operation Condition Status register.
Trigger Commands l With continuous triggering disabled, the trigger system must be initiated for each trigger using the INITiate:TRANsient command. l ABORt:TRANsient does not abort continuous triggers if INITiate:CONTinuous:TRANsient ON has been programmed. In this case, the trigger system will automatically re-initiate. TRIGger:TRANsient[:IMMediate] Generates an immediate trigger. This overrides any selected trigger source. Transient triggers affect the output voltage and output current.
Status Tutorial Status Tutorial This section provides a detailed description of the individual registers and register groups. The status diagram at the end of this topic provides an graphical view of how the status registers and groups are interconnected.
Status Tutorial Bit Decimal Value Bit Name Definition 0 CV 1 Output is in constant voltage 1 CC 2 Output is in constant current 2 OFF 4 Output is programmed off 3 not used not used 0 is returned 4 WTG-tran 16 Transient system is waiting or a trigger 5-15 not used not used 0 is returned Questionable Status Group These register groups record signals that indicate abnormal operation. The group consists of a Condition, PTR/NTR, Event, and Enable register.
Status Tutorial cleared when read. The Standard Event enable register functions similarly to the enable registers of the Operation and Questionable status groups. Refer to Status Registers for a description of each register. The following table describes the Standard Event Status register bit assignments. Bit Bit Name Decimal Value Definition 0 Operation Complete 1 All commands before and including *OPC have been executed.
Status Tutorial Bit Bit Name Decimal Value Definition 5 Event Status Summary 32 One or more bits are set in the Standard Event Register. Bits must be enabled, see *ESE. 6 Master Status Summary 64 One or more bits are set in the Status Byte Register and may generate a Service Request. Bits must be enabled, see *SRE. 7 Operation Status Summary 128 One or more bits are set in the Operation Status Register. Bits must be enabled, see STATus:OPERation:ENABle.
Status Tutorial Status Diagram 104 Agilent N8900 Series Operating and Service Guide
Command Quick Reference Command Quick Reference Some [optional] commands have been included for clarity. All settings commands have a corresponding query. See the Syntax Conventions for SCPI. ABORT Command ABORt :TRANsient Cancels any triggered actions. CALibrate Commands CALibrate :COUNt? Returns the number of times the unit has been calibrated. :CURRent [:LEVel] [] Calibrates the current programming and measurement. :DATA Enters the calibration value read by the external meter.
Command Quick Reference *RCL Recalls a saved instrument state *RST Reset *SAV Saves an instrument state *SRE Set service request enable register *STB? Return status byte *TRG Trigger *TST? Performs self-test, then returns result *WAI Pauses additional command processing until all device commands are done INITiate Commands INITiate [:IMMediate] :TRANsient Initiates the transient trigger system.
Command Quick Reference [SOURce:] Commands [SOURce:] CURRent [:LEVel] [:IMMediate] [:AMPLitude] Sets the output current :TRIGgered [:AMPLitude] :MODE FIXed|STEP Sets the triggered output current Sets the transient mode. :PROTection :DELay Sets the over-current protection delay. :STATe 0|OFF|1|ON Enables or disables the over-current protection.
Command Quick Reference SYSTem Commands SYSTem :COMMunicate :LAN|TCPip:CONTrol? :RLSTate LOCal|REMote|RWLock :ERRor? Returns the initial socket control connection port number. Configures the remote/local state of the instrument. Reads and clears one error from the error queue. :SECurity :IMMediate :VERSion? Clears all user memory and reboots the instrument. Returns the SCPI version that the instrument complies with. TRIGger Commands TRIGger :TRANsient 108 [:IMMediate] Generates an immediate trigger.
Reset State (*RST) Reset State (*RST) The power-on/reset state may differ from that shown below if you have enabled power-on state recall mode from the States menu (see Instrument State Storage). The following tables show the reset state. These parameters are reset to the indicated values at power-on or after *RST.
Reset State (*RST) GPIB address 5 GPIB interface Enabled LAN interface Enabled USB interface Enabled Screen saver Enabled Screen saver delay 60 minutes Wake on I/O Enabled Interface as-shipped settings Get IP Address Automatic IP Address 169.254.89.00 Subnet mask 255.255.0.0 Default gateway 0.0.0.0 Host name A-N89xxx-xxxxx mDNS service name A-N89xxx-xxxxx.local.
SCPI Error Messages SCPI Error Messages The Agilent instrument returns error messages in accord with the SCPI standard. l Up to 20 errors can be stored in each interface-specific error queue (one each for GPIB, USB, VXI-11, and Telnet/Sockets.) Errors appear in the error queue of the I/O session that caused the error. l The instrument beeps once each time a command syntax or hardware error is generated. The front-panel ERROR annunciator turns on when one or more errors are in the error queue.
SCPI Error Messages 202 Selftest Fail A selftest failure has occurred. See selftest failure list for details. 209 Internal communication error An internal communication error has occurred in the instrument. 210 Frame NVRAM error A non-volatile RAM error has occurred in the instrument. 308 This setting cannot be changed while transient trigger is initiated Setting cannot be changed while the instrument is waiting for or executing a trigger sequence.
SCPI Error Messages -109 Missing parameter Fewer parameters were received than were expected. -110 Command header error An error was detected in the header. -111 Header separator error A character that was not a valid header separator was found in the command string. -112 Program mnemonic too long The header contains more than 12 characters. -113 Undefined header A command was received that was not valid for this instrument. -114 Header suffix out of range The value of the numeric suffix is not valid.
SCPI Error Messages -144 Character data too long The character data element contains more than 12 characters. -148 Character data not allowed A discrete parameter was received, but a string or numeric parameter was expected. -150 String data error Generic string data error -151 Invalid string data An invalid character string was received. Check that the string is enclosed in quotation marks. -158 String data not allowed A character string was received, but is not allowed for this command.
SCPI Error Messages -240 Hardware error The command could not be executed because of a hardware problem with the instrument. -241 Hardware missing The command could not be executed because of missing hardware, such as an option. Query Errors (these errors set Standard Event Status register bit #2) -400 Query Error Generic error query -410 Query INTERRUPTED A condition causing an interrupted query error occurred. -420 Query UNTERMINATED A condition causing an unterminated query error occurred.
Compatibility Commands Compatibility Commands The commands described in this section are provided for compatibility with the existing N6700 series modular power system (MPS). Note that the compatibility commands discussed in this section have no or little effect on the operation of the N8900 models, as they access functions that are either redundant or not available. Channel Parameter Since the N8900 models are single channel units, SCPI commands do not require a channel list parameter.
Service and Maintenance Service and Maintenance Further service and maintenance topics: Verification and Calibration Self-Test Procedure Firmware Update Instrument Sanitize Calibration Switches Disassembly Manual Updates Types of Service Available If your instrument fails during the warranty period, Agilent Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Agilent offers repair services at competitive prices.
Service and Maintenance l Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the model number and full serial number. l Place the unit in its original container with appropriate packaging material. l Secure the container with strong tape or metal bands. l If the original shipping container is unavailable, use a container that will ensure at least 10 cm (4 in.) of compressible packaging material around the entire instrument.
Verification and Calibration Verification and Calibration Further Verification and Calibration topics: Recommended Test Equipment and Setups Performance Verification Calibration Procedure Test Record Forms Verification The verification procedures verify that the Agilent N8900 series power supply is operating normally and is within published specifications. If the instrument fails any of the tests or if abnormal test results are obtained, try calibrating the unit.
Verification and Calibration line cycles per measurement. If you are using an Agilent 3458A DMM also turn on auto-calibration (ACAL) and the autorange function (ARANGE). Current Shunt The 4-terminal current shunt is used to make accurate current measurements. It has two monitoring terminals as well as two load terminals. Connect the voltmeter directly to the monitoring terminals. Also allow sufficient airflow for cooling.
Recommended Test Equipment and Setups Recommended Test Equipment and Setups Test Equipment Verification and Calibration Setups Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy.
Recommended Test Equipment and Setups Verification and Calibration Setups HAZARDOUS VOLTAGES All models generate voltages in excess of 60 VDC, with some models rated at up to 1,500 VDC! Ensure that all instrument connections, load wiring, and load connections are either insulated or covered so that no accidental contact with lethal output voltages can occur.
Performance Verification Performance Verification Voltage Programming and Readback Accuracy Constant Voltage Load Effect Constant Voltage Ripple and Noise Transient Recovery Time Current Programming and Readback Accuracy Constant Current Load Effect HAZARDOUS VOLTAGES The output may be enabled at turn-on, depending on the *PON setting. Check this setting before attaching anything to the output terminals.
Performance Verification Voltage Programming and Readback Accuracy This test verifies that the voltage programming and measurement functions are within specifications. Step 1. Turn off the power supply and connect a DMM and an electronic load to the output (see Test Setup A). Also connect the remote sense leads to the output. Step 2. Turn on the power supply and program the instrument settings as described in the test record form under “Voltage Programming & Readback, Min Voltage”. Turn the output on.
Performance Verification Constant Voltage Ripple and Noise Periodic and random deviations in the output combine to produce a residual AC voltage superimposed on the DC. This residual voltage is specified as the rms or peak-to-peak noise in the indicated frequency range (see Specifications). Step 1. Turn off the power supply and connect an electronic load, differential amplifier, and an oscilloscope (ac coupled) to the output (see Test Setup C). Step 2.
Performance Verification Step 6. The output voltage should return to within the specified voltage at the specified time following the load change. Check the loading transient by triggering on the negative slope. Record the voltage at time “t” in the performance test record form under “Transient Response”. Current Programming and Readback Accuracy This test verifies that the current programming and measurement functions are within specifications. Step 1.
Calibration Procedure Calibration Procedure Enter Calibration Mode Voltage Calibration - With Remote Sensing Voltage Calibration - With Local Sensing Current Calibration Enter a Calibration Date and Log Out HAZARDOUS VOLTAGES The output may be enabled at turn-on, depending on the *PON setting. Check this setting before attaching anything to the output terminals. Introduction The instrument features closed-case electronic calibration; no internal mechanical adjustments are required.
Calibration Procedure Enter Calibration Mode Front Panel Menu SCPI Command Select System\Admin\Login. CAL:STAT ON Enter your password in the Password field. Then press Select. Voltage Calibration - With Remote Sensing Voltage Programming and Measurement To guarantee a clean signal for calibration points 1 through 3, program the electronic load to at least 5% of the rated output current of the model being calibrated. Step 1. Turn off the output.
Calibration Procedure SHOCK HAZARD The next step applies the full output voltage of the power supply to the output terminals. Turn off the electronic load before proceeding. If the electronic load is rated less than the voltage rating of the power supply, you must also physically disconnect the load from the power supply using the switch as shown in Test Setup A. Front Panel A warning message about the full scale output voltage appears on the display. Select Next. SCPI Command Not applicable Step 6.
Calibration Procedure Current Calibration Current Programming and Measurement To guarantee a clean signal for calibration points 1 through 4, program the electronic load to either 2% of the full-scale voltage rating of the power supply or 3 V - whichever is greater. Step 1. Turn off the output. Connect an electronic load and a precision current shunt to the output terminals. The current shunt should be able to measure the rated output current of the power supply.
Calibration Procedure Step 6. Select the fourth current calibration point. Wait 3 minutes for the internal shunt temperature to stabilize. Calculate the shunt current (I=V/R) and enter the data. Front Panel Display shows: “Enter P4 measured data” Enter the data from the external DMM. This should be the full-scale current rating. Press Enter when done. Press Back repeatedly to back out of the calibration menu. SCPI Command CAL:LEV P4 *OPC? CAL:DATA Step 7. Save the calibration data.
Test Record Forms Test Record Forms N8920A/N8940A N8920A/N8940A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 3.92 V Vdmm – 80 mV 75.92 V Vdmm – 80 mV _______ _______ _______ _______ 4.08 V Vdmm + 80 mV 76.
Test Record Forms N8921A/N8941A N8921A/N8941A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 9.8 V Vdmm – 200 mV 189.8 V Vdmm – 200 mV _______ _______ _______ _______ 10.2 V Vdmm + 200 mV 190.
Test Record Forms N8923A/N8943A N8923A/N8943A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 24.5 V Vdmm – 500 mV 474.5 V Vdmm – 500 mV _______ _______ _______ _______ 25.5 V Vdmm + 500 mV 475.
Test Record Forms N8924A/N8944A N8924A/N8944A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 36.75 V Vdmm – 750 mV 711.75 V Vdmm – 750 mV _______ _______ _______ _______ 38.25 V Vdmm + 750 mV 713.
Test Record Forms N8925A/N8945A N8925A/N8945A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 3.92 V Vdmm – 80 mV 75.92 V Vdmm – 80 mV _______ _______ _______ _______ 4.08 V Vdmm + 80 mV 76.
Test Record Forms N8926A/N8946A N8926A/N8946A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 9.8 V Vdmm – 200 mV 189.8 V Vdmm – 200 mV _______ _______ _______ _______ 10.2 V Vdmm + 200 mV 190.
Test Record Forms N8928A/N8948A N8928A/N8948A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 24.5 V Vdmm – 500 mV 474.5 V Vdmm – 500 mV _______ _______ _______ _______ 25.5 V Vdmm + 500 mV 475.
Test Record Forms N8929A/N8949A N8929A/N8949A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 36.75 V Vdmm – 750 mV 711.75 V Vdmm – 750 mV _______ _______ _______ _______ 38.25 V Vdmm + 750 mV 713.
Test Record Forms N8930A/N8950A N8930A/N8950A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max.
Test Record Forms N8931A/N8951A N8931A/N8951A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 3.92 V Vdmm – 80 mV 75.92 V Vdmm – 80 mV _______ _______ _______ _______ 4.08 V Vdmm + 80 mV 76.
Test Record Forms N8932A/N8952A N8932A/N8952A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 9.8 V Vdmm – 200 mV 189.8 V Vdmm – 200 mV _______ _______ _______ _______ 10.2 V Vdmm + 200 mV 190.
Test Record Forms N8934A/N8954A N8934A/N8954A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 24.5 V Vdmm – 500 mV 474.5 V Vdmm – 500 mV _______ _______ _______ _______ 25.5 V Vdmm + 500 mV 475.
Test Record Forms N8935A/N8955A N8935A/N8955A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 36.75 V Vdmm – 750 mV 711.75 V Vdmm – 750 mV _______ _______ _______ _______ 38.25 V Vdmm + 750 mV 713.
Test Record Forms N8937A/N8957A N8937A/N8957A Test Record Test Description Report Number ______ Date__________ Model Min. Specs Results Max. Specs With Remote Sensing Voltage Programming & Readback Minimum voltage (Vout): Voltage measured over interface: High voltage (Vout): Voltage measured over interface: Both Both Both Both 73.5 V Vdmm – 1.5 V 1498.5 V Vdmm – 1.5 V _______ _______ _______ _______ 76.5 V Vdmm + 1.5 V 1501.5 V Vdmm + 1.
Self-Test Procedure Self-Test Procedure Power-On Self-Test Each time the instrument is powered on, a subset of self-tests are performed. This assures you that the instrument is operational. Self-test checks that the minimum set of logic and power mesh systems are functioning properly. Self-test does not enable the output or place any voltages on the output. It leaves the instrument in the reset state. User-Initiated Self-Test The user-initiated self-test is the same as the power-on self-test.
Firmware Update Firmware Update Refer to Instrument Identification to determine which firmware version is installed on your instrument. Software Required To update the firmware you need to download the following two items onto your computer from the N8900 product page at www.agilent.com/find/n8900 . l The latest firmware version l The Universal Firmware Update Utility Update Procedure Once you have copied both items to your computer, proceed as follows: 1. Run the Universal Firmware Update Utility 2.
Instrument Sanitize Instrument Sanitize This procedure is not recommended for use in routine applications because of the possibility of unintended loss of data. This procedure is typically used to prepare the instrument for removal from a secure area. It writes all zeros to flash memory and then performs a full chip erase as per the manufacturer’s data sheet. Identification data such as instrument firmware, model number, serial number, MAC address, and calibration data is not erased.
Calibration Switches Calibration Switches SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover.Some circuits are active and have power for a short time even when the power switch is turned off. Two switches control the access to calibration commands.
Disassembly Disassembly SHOCK HAZARD Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Some circuits are active and have power for a short time even when the power switch is turned off. Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling.
Disassembly Agilent N8900 Series Operating and Service Guide 151
Manual Updates Manual Updates Output Terminal Isolation The Supplemental Characteristics section of this document describes the present output terminal isolation voltage limits for Version 2 and Version 3 instruments. Version 2 and Version 3 instruments are clearly labeled as such on the rear label located on the AC input cover. Previous instrument versions DO NOT have version number identification on their rear labels.
