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Agilent Technologies N3280A User's Manual

1. 4 10k 10k FREQUENCY Hz FREQUENCY Hz VOLTAGE PRIORITY bandwidth 20kHz CURRENT LIMIT bandwidth 10kHz a ath i o 1 OUTPUT IMPEDANCE ohms o N a PHASE degrees 10k 10k FREQUENCY Hz FREQUENCY Hz VOLTAGE PRIORITY bandwidth 10kHz CURRENT PRIORITY MODE Figure A 1 Output Impedance Graphs all outputs 82 Performance Tests and Calibration Introduction This appendix contains test procedures to verify that the dc source is operating normally and is within published specifications There are three types of tests as follows Built in Self Tests These tests run automatically when the dc source is turned on They check most of the digital circuits and the programming and readback DACs Turn on Checkout These tests described in chapter four provide a high degree of confidence that your unit is operating properly Calibration Verification These tests documented in this appendix verify that the dc source is Performance Tests properly calibrated and that the dc source meets all of the specifications listed in Appendix
2. 1 3ms 5 points 1 3ms 5 points 1 3ms 5 points 1 3ms 5 points Peak Current Limit 1 3A typical 5mA typical not programmable Vset 5V Curr Limit 0 5125A Vset 10V Curr Limit 0 1A CV to CL mode crossover 1A for 200us typical 0 2A for 600us typical Voltage Programming Voltage to within 20mV 10kHz 420us Settling Time Voltage to within 20mV 30kHz 350us Programming Output Rise Time Voltage 10 to 90 10kHz Curr Lim 10 to 90 Curr Lim 10 to 90 Current 80 to 80 1 If current limit is programmed less than 75uA the current limit will be set to 75uA no error will be generated 2 Approximate voltage loop bandwidth with no external capacitor 3 Approximate current limit circuit bandwidth with output shorted 4 Time from the start of bus communication to final byte returned on bus Assumes the default of 5 data points 30 4us apart 5 With any voltage bandwidth setting and 30kHz current limit bandwidth setting 6 With a 20 ohm load resistor and current limit set to 0 5125A program voltage 0V to 10V Measure time for voltage to settle within 20mV of final value 7 With 20 ohm load resistor and current limit set to 0 5 125A program voltage from OV to 10V 8 With 20 ohm load resistor and voltage set to 10 25V program current limit from 0A to 0 5A 9 With 20 ohm load resistor and voltage set to 10 25V program current limit from 0A
3. au Zeonaqaan La cas ae L O 97631 108642 O 109 AARD 36 ABORT 73 accessories 14 address switch 21 airflow 20 averaging measurements 43 AWG ratings 23 C cables 14 calibration 99 equipment 83 error messages 102 GPIB 99 password 102 saving 101 setup 85 calibration commands 57 CAL CURR 57 LIM 57 CAL CURR MEAS 57 CAL DATA 58 CAL DATE 58 CAL LEV 58 CAL PASS 58 CAL SAVE 59 CAL STAT 59 CAL VOLT 59 capabilities 14 channel parameter 34 range 34 character strings 36 characteristics 79 checkout procedure 28 cleaning 19 coaxial connections 24 combine commands common commands 33 from different subsystems 33 root specifier 33 command completion 36 external synchronization 37 internal synchronization 37 common command syntax 53 common commands 75 CLS 75 ESE 75 ESR 75 IDN 76 OPC 76 OPT 76 Index RST 77 SRE 77 STB 77 TRG 78 TST 78 WAI 78 constant voltage tests 84 controller connections 25 conventions used in this guide 32 CRD 36 current 40 measurement range 45 current measurement range 61 current priority 16 D damage 19 description 14 determining cause of interrupt 52 device clear 37 digital connector 19 dimensions 20 disconnect relays 14 electronic load 85 enabling the output 39 error messages 29 error numbers 103 external trigger 43
4. This command configures the output compensation band for the voltage mode If capacitive loads cause the output to oscillate use this command to select a lower compenstion band Note that if the output is on changing the compensation will cause the output to cycle OFF then ON The following compensation bandwidths may be programmed 30 kHz 20 kHz or 10 kHz Command Syntax SOURce VOLTage ALC BWIDth lt Nrf gt lt channel list gt Parameters 10000 20000 30000 RST Value 30000 Examples VOLT ALC BWID 10000 1 Query Syntax SOURce VOLTage ALC BWIDth lt channel list gt Returned Parameters lt NR3 gt SOURce VOLTage IMMediate SOURce VOLTage TRIGgered These commands set the immediate and the pending triggered voltage level of the dc source The immediate level is the voltage programmed for the output terminals The pending triggered level is a stored value that is transferred to the output terminals when a trigger occurs To respond to a trigger the SOUR VOLT MODE must be set to STEP and the trigger system must be initiated Command Syntax SOURce VOLTage LEVel IMMediate AMPLitude lt NRf gt lt channel list gt SOURce VOLTage LEVel TRIGgered AMPLitude lt Nrf gt lt channel list gt Parameters see table 6 3 Default Suffix V volts RST Value 0 Examples VOLT 2 5 1 VOLT TRIG 20 1 Query Syntax SOURce VOLTage LEVel IMMediate AMPLitude lt channel list gt SOURce VOLTa
5. 47 F fetch commands 43 60 FETC ARR CURR 60 FETC ARR VOLT 60 FETC CURR 60 FETC VOLT 60 front panel indicators 27 line switch 27 fuse 19 GPIB capabilities 31 GP IB address 25 command library for MS DOS 31 connections 25 controller programming 31 111 Index IEEE Std for standard codes 31 IEEE Std for standard digital interface 31 interface 25 references 31 trigger 43 47 GPIB connector 21 ground earth 3 guard connections 24 guide user s 13 Hanning 45 63 header 35 long form 35 short form 35 history 6 indicaror Error 27 On 27 Power 27 Prot 27 indicator Active 27 initialization 39 initiate commands 73 INIT NAME 73 input connections 21 power 14 inspection 19 internally triggered measurements 45 a po language dictionary 53 lead resistance 23 line fuse changing 107 109 replacing 29 line module 21 line switch 27 line voltage 21 selection 107 109 load voltage drops 23 location 20 M making measurements 43 manuals 19 MAV bit 51 measure commands 43 60 MEAS ARR CURR 61 MEAS ARR VOLT 61 MEAS CURR 61 MEAS VOLT 61 measurement delay 17 overview 17 112 measurement points 44 measurement samples 44 measurement trigger function 47 generating 47 initiating 46 output delay 47 source 46 measurement trigger system model 46 measurements arrays 45 Hanning window 45 Rectangular win
6. MEASure ARRay CURRent MEASure ARRay VOLTage MEASure CURRent MEASure VOLTage SENSe CURRent RANGe SENSe FUNCtion SENSe SWEep NPLCycles SENSe SWEep OFFSet POINts SENSe SWEep POINts SENSe SWEep TINTerval SENSe WINDow Output Commands OUTPut OUTPut OSCProtect OUTPut PROTection CLEar SOURce CURRent MMediate SOURce CURRent TRIGgered SOURce CURRent LIMit IMMediate SOURce CURRent LIMit TRIGgered SOURce CURRent LIMit BWIDth SOURce CURRent MODE SOURce CURRent LIMit MODE SOURce DELay SOURce DELay MODE SOURce FUNCtion MODE SOURce VOLTage ALC BWIDth SOURce VOLTage IMMediate SOURce VOLTage TRIGgered SOURce VOLTage MODE SOURce VOLTage PROTection STATe Status Commands STATus OPERation EVENt STATus OPERation CONDition STATus OPERation ENABle STATus OPERation NTR STATus OPERation PTR STATus PRESet STATus QUEStionable EVENt STATus QUEStionable CONDition STATus QUEStionable ENABle STATus QUEStionable NTR STATus QUEStionable PTR System Commands SYSTem ERRor SYSTem VERSion Trigger Commands ABORt INITiate NAME TRIGger ACQuire TRIGger ACQuire SOURce TRIGger TRANsient SOURce TRIGger TRANsient Common Commands CLS ESE ESR IDN OPC OPT RST SRE STB TRG TST WAI SPECIFICATIONS Introduction PERFORMANCE TESTS AND CALIBRATION Introduction Equipment Required Performance amp Verification Tests Measurement Techniques Electro
7. The output voltage is controlled with the VOLTage command To set all four outputs to 5 volts use VOLT 5 1 4 The maximum output voltage that can be programmed can be queried with VOLT MAX lt channel list gt 39 5 Programming the DC Source Overvoltage Protection The dc source will turn off its output and open the output relays if the output voltage exceeds 11 5V 0 3V or 11 5V 0 3V when measured at the output terminals Overvoltage protection is only available when operating in voltage priority mode It is enabled with VOLT PROT STAT lt bool gt lt channel list gt where lt bool gt is the protection state 0 OFF 1 ON CAUTION If overvoltage protection is disabled the dc source or the equipment under test will not be protected from excessive external voltages Output Current When operating in voltage priority mode the dc source has a programmable current limit which applies to both positive and negative output currents The command to program the current limit is CURR LIM lt n gt lt channel list gt where lt n gt is the current limit in amperes If the load attempts to draw more current than the programmed limit the output voltage is reduced to keep the current within the limit To query the maximum output current limit that can be programmed use CURR LIM MAX lt channel list gt When operating in current priority mode the de source has a programmable output curr
8. adjust the load or the output voltage slightly until the unit goes into CV mode Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 120 Vac nominal line voltage input Set the DVM to the 10V range and record the output voltage reading on the DVM low line value Adjust the transformer to the highest rated line voltage e g 127 Vac for 120 Vac nominal line voltage input Record the output voltage reading on the DVM high line value The difference between the low line and the high line value is the source effect voltage and should be within the limits listed in the performance test record card under Voltage Priority Source Effect Voltage Voltage Priority Current Limit Source Effect Action Connect the ac input of the dc source to a variable voltage transformer or ac source Set the transformer to nominal line voltage Connect the output as shown in Figure B 1a with an ammeter directly across the Hi and Lo output terminals Turn on the de source and program the output voltage to the maximum positive value 10 25V and the current limit to 0 5A Read back the N3280A status to be sure that it s in the CL mode This query should return a Bit value of 2 for CL mode Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 120 Vac nominal line voltage input Set the ammeter to the 1A range and record the current reading on the ammeter low line value Adjust
9. list TRIGgered AMPLitude lt n gt list LIMit POSitive IMMediate AMPLitude lt n gt list BWIDth lt bandwidth gt list TRIGgered AMPLitude lt n gt list MODE lt mode gt list DELay TIME lt n gt list MODE lt mode gt list FUNCtion MODE lt mode gt list VOLTage ALC BWIDth lt bandwidth gt list LEVel IMMediate AMPLitude lt n gt list TRIGgered AMPLitude lt n gt list MODE lt mode gt list PROTection STATe lt bool gt list STATus OPERation EVENt list CONDition list ENABle lt n gt list NTRansition lt n gt list PTRansition lt n gt list PRESet QUEStionable EVENt list CONDition list ENABle lt n gt list NTRansition lt n gt list PTRansition lt n gt list SYSTem ERRor VERSion TRIGger ACQuire IMMediate SOURCce lt source gt TRANsient IMMediate SOURce lt source gt NOTE Sets the output current in current priority mode Sets the triggered output current in current priority mode Sets the current limit in voltage priority mode Sets the output compensation bandwidth Sets the triggered current limit in voltage priority mode Sets the current trigger mode FIXed STEP Sets the output settling delay time in Manual mode Sets the output settling delay mode AUTO MANual Sets the output mode VOLTage CURRent
10. low line value 5 Adjust the transformer to the highest rated line voltage e g 127 Vac for 120 Vac nominal line voltage input Record the current reading on the ammeter high line value 6 The difference between the low line and the high line values is the source effect voltage and should be within the limits listed in the performance test record card under Voltage Priority Source Effect Current Limit Current Priority Constant Current Source Effect NOTE The voltage limits in Current Priority Mode are not programmable Action Program Commands 1 Connect the ac input of the de source to a variable voltage transformer or ac source Set the transformer to nominal line voltage Connect the output as shown in Figure B la with an ammeter directly across the Hi and Lo output terminals 2 Turn on the de source and program the Current Priority mode OUTP ON 1 Program the current to 0 5mA SOUR FUNC MODE CURR 1 CURR 0 0005 1 3 Read back the N3280A status to be sure that it s in the CC mode This STAT OPER COND 1 query should return a Bit value of 8 for CC mode 4 Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 120 Vac nominal line voltage input Set the ammeter to the 1mA range and record the current reading on the ammeter low line value 5 Adjust the transformer to the highest rated line voltage e g 127 Vac for 120 Vac nominal lin
11. 1 gt register value STATus QUEStionable ENABle This command and its query set and read the value of the Questionable Enable register This register is a mask for enabling specific bits from the Questionable Event register to set the questionable summary bit QUES of the Status Byte register This bit bit 3 is the logical OR of all the Questionable Event register bits that are enabled by the Questionable Status Enable register Command Syntax STATus QUEStionable ENABle lt NRf gt lt channel list gt Parameters 0 to 32767 Preset Value 0 Examples STAT QUES ENAB 4096 1 enables OSC Query Syntax STATus QUEStionable ENABle lt channel list gt Returned Parameters lt NR 1 gt register value Related Commands STAT QUES STATus QUEStionable NTR STATus QUEStionable PTR These commands allow you to set or read the value of the Questionable NTR Negative Transition and PTR Positive Transition registers These registers serve as polarity filters between the Questionable Enable and Questionable Event registers to cause the following actions When a bit of the Questionable NTR register is set to 1 then a 1 to 0 transition of the corresponding bit of the Questionable Condition register causes that bit in the Questionable Event register to be set When a bit of the Questionable PTR register is set to 1 then a 0 to 1 transition of the corresponding bit in the Questionable Condition register causes that bit in the Questionable Ev
12. 5 points 0 1 200uA 5 points 0 1 5uA 5 points 0 1 200nA 1 PLC 0 380mV 4mV 40uA N A 400uV 30uA 30uA N A 200uV 10uA 10uA N A in voltage priority mode guaranteed between 0 5125A and 0 5125A Readback for Voltage 0 5A and 15mA current ranges is based on capturing 5 data points at intervals of 30 4us and averaging the readings Readback for 0 5mA current range is based on averaging the readings over power line cycle 60 Hz 548 points 30 4us The default setting for all readback ranges is the average of 5 data points 30 4us apart 2 Program Vset to 10V using a 20 ohm load resistor 3 Program current to 500mA using a 20 ohm load resistor Program Vset to 10 25V Program current to 0 5mA using a 16K ohm load resistor 5 Measured with a 10uF output capacitor with 0 2 ohm ESR across the output with the current limit set to 0 5125A The load current rise time is approximately 10us for a current change of 0 25Ato 0 5A or 0 5A to 0 25A Measure the output voltage recovery time to within 40mV of its final value Measured following a voltage change of 1V to 1 V or 1V to 1V with approximately 25us time constant with the current priority current level set to OuA Measure the output current recovery time to within 1mA of its final value 79 A Specifications Table A 2 lists the supplemental characteristics which are not warranted but are descriptions of typical performance determined eit
13. Group Execute Trigger TRIGger TRANsient SOURce lt source gt BUS EXTernal BUS TRIG SOUR EXT TRIGger TRANsient SOURce lt CRD gt This command generates an output trigger Output triggers affect the following functions voltage current and current limit To program an output trigger you must specify a trigger level for the selected function set the selected function to STEP mode and initiate the trigger system Once these conditions are met the output trigger will l Initiate a pending level change as specified by SOURce CURRent TRIGgered SOURce CURRent LIMit TRIGgered or SOURce VOLTage TRIGgered sequences have completed Command Syntax Parameters Examples Related Commands 74 Clear the WTG bit in the Status Operation Condition register after both transient and acquire trigger WTG is the logical or of both transient and acquire sequences TRIGger TRANsient IMMediate None TRIG TRIG IMM ABOR INIT TRG VOLT TRIG CURR TRIG CURR LIM TRIG CURR MODE CURR LIM MODE VOLT MODE Language Dictionary 6 Common Commands CLS This command causes the following actions see chapter 5 for the descriptions of all registers Clears the Standard Event Status Operation Status Event and Questionable Status Event registers Clears the Status Byte and the Error Queue If CLS immediately follows a program message terminator lt NL gt then the output queue and the MAV bit are also cl
14. MANUAL If an output is changed and a subsequent measurement is requested the measurement will be delayed to allow the output to settle Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters SOURce DELay TIMe lt Nrf gt lt channel list gt 0 to 1000 seconds 0 DEL 001 1 SOURce DELay TIMe lt channel list gt lt NR3 gt SOURce DELay MODE This command selects the source delay mode AUTO MANual Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters 66 The dc source selects an appropriate delay for the present output voltage or current The delay programmed by SOURce will be used as the delay SOURce DELay MODE lt mode gt lt channel list gt AUTO MANual AUTO DEL MODE AUTO 1 SOURce DELay MODE lt channel list gt lt CRD gt Language Dictionary 6 SOURce FUNCtion MODE This comand configures the output operating mode Note that if the output is on changing the output mode will cause the output to cycle OFF then ON VOLTage Configures the output for voltage priority operation CURRent Configures the output for current priority operation Command Syntax SOURce FUNCtion MODE lt mode gt lt channel list gt Parameters VOLTage CURRent RST Value VOLT Examples FUNC MODE VOLT 1 Query Syntax SOURce FUNC MODE lt channel list gt Returned Parameters lt CRD gt SOURce VOLTage ALC BWIDth
15. SOURce CURRent LEVel TRIGgered AMPLitude lt Nrf gt lt channel list gt see table 6 3 A amperes CURR 0 0001 1 CURR TRIG 0 0002 1 SOURce CURRent LEVel IMMediate AMPLitude lt channel list gt SOURce CURRent LEVel TRIGgered AMPLitude lt channel list gt lt NR3 gt INIT CURR MODE SOURce CURRent LIMit IMMediate SOURce CURRent LIMit TRIGgered These commands set the immediate and the pending triggered current limit of the dc source They only apply in voltage priority mode The current limit setting applies to both the positive and negative current limits The pending triggered limit is a stored value that applies when a trigger occurs To respond to a trigger the S OUR CURR LIM MODE must be set to STEP and the trigger system must be initiated Command Syntax Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands SOURce CURRent LIMit POSitive IMMediate lt Nrf gt lt channel list gt SOURce CURRent LIMit POS itive TRIGgered lt Nrf gt lt channel list gt see table 6 3 A amperes 0 001 CURR LIM 0 25 1 CURR LIM TRIG 0 35 1 SOURce CURRent LIMit POSitive IMMediate lt channel list gt SOURce CURRent LIMit POSitive TRIGgered lt channel list gt lt NR3 gt INIT CURR LIM MODE SOURce CURRent LIMit BWIDth This command configures the output compensation band of the current limit
16. SWE POIN MEAS ARR VOLT 1 MEASure CURRent MEASure VOLTage These queries initiate and trigger a measurement and return either the output current in amperes or output voltage in volts The total measurement time is specified by SENSe SWEep NPLCycles NOTE You can specify an optional maximum value parameter This lets you use a different current range for a single measurement without having to change current ranges Query Syntax Parameters Examples Returned Parameters Related Commands MEASure SCALar CURRent DC lt maximum value gt lt channel list gt MEASure SCALar VOLTage DC lt channel list gt None MEAS CURR 0 1 1 lt NR3 gt lt NR3 gt FETC VOLT FETC CURR MEAS VOLT 1 SENS SWE NPLC SENSe CURRent RANGe This command selects one of the following dc current measurement ranges based on the value entered 0 5A 15mA 0 5 mA Enter values greater than 0 015A Enter values greater than 0 0005A up to 0 015A Enter values less than and up to 0 0005A The programmed value must be the maximum current that you expect to measure Crossover values are 0 5 mA and 15 mA respectively When queried the returned value is the maximum dc current that can be measured on the range that is presently set Command Syntax Parameters Unit RST Value Examples Query Syntax Returned Parameters SENSe CURRent DC RANGe UPPer lt Nrf gt lt channel list gt The maximum current that
17. Sets the output compensation bandwidth Sets the output voltage in voltage priority mode Sets the triggered output voltage in voltage priority mode Sets the voltage trigger mode FIXed STEP Enables disables overvoltage protection on the selected output Returns the value of the event register Returns the value of the condition register Enables specific bits in the Event register Sets the Negative transition filter Sets the Positive transition filter Presets all enable and transition registers to power on Returns the value of the event register Returns the value of the condition register Enables specific bits in the Event register Sets the Negative transition filter Sets the Positive transition filter Returns the error number and error string Returns the SCPI version number Triggers the measurement immediately Sets the measurement trigger source BUS EXTernal Triggers the output immediately Sets the output trigger source BUS EXTernal Some optional commands have been included for clarity Refer to chapter 6 for a complete description of all programming commands 55 6 Language Dictionary Table 6 2 Common Commands Syntax CLS Clear status ESE lt n gt Standard event status enable ESE Return standard event status enable ESR Return event status register IDN Return instrument identification OPC Enable operation complete bit in ESR OPC Return a 1 when operation complete OPT Re
18. Standard Event Status Group This group consists of an Event register and an Enable register that are programmed by Common commands The Standard Event event register latches events relating to instrument communication status see figure 5 5 It is a read only register that is cleared when read The Standard Event enable register functions similarly to the enable registers of the Operation and Questionable status groups Command Action ESE programs specific bits in the Standard Event enable register ESR reads and clears the Standard Event event register Status Byte Register This register summarizes the information from all other status groups as defined in the JEEE 488 2 Standard Digital Interface for Programmable Instrumentation See Table 5 1 for the bit configuration Command Action STB reads the data in the register but does not clear it returns MSS in bit 6 serial poll clears RQS inside the register and returns it in bit position 6 of the response The MSS and RQS Bits MSS is a real time unlatched summary of all Status Byte register bits that are enabled by the Service Request Enable register MSS is set whenever the dc source has one or more reasons for requesting service STB reads the MSS in bit position 6 of the response but does not clear any of the bits in the Status Byte register The RQS bit is a latched version of the MSS bit Whenever the dc source requests service it sets the SRQ interrupt line
19. any previous header path For example you could clear the output protection and check the status of the Operation Condition register in one message by using a root specifier as follows OUTPut PROTection CLEar 1 STATus OPERation CONDition 1 The following message shows how to combine commands from different subsystems as well as within the same subsystem VOLTage LEVel 7 5 1 PROTection ON 1 CURRent LIMit 0 25 1 Note the use of the optional header LEVel to maintain the correct path within the subsystems and the use of the root specifier to move between subsystems Including Common Commands You can combine common commands with system commands in the same message Treat the common command as a message unit by separating it with a semicolon the message unit separator Common commands do not affect the header path you may insert them anywhere in the message voLTage TRIGgered 10 1 INITiate NAME TRAN TRG OUTPut OFF 1 RCL 2 OUTPut ON 1 Using Queries Observe the following precautions with queries Adda blank space between the query indicator and any subsequent parameter such as a channel Set up the proper number of variables for the returned data Read back all the results of a query before sending another command to the de source Otherwise a Query Interrupted error will occur and the unreturned data will be lost 33 4 Introduction to Programming Types of SCPI Messages T
20. boxes represent states Arrows show the transitions between states Arrows are labeled with the event that causes the transition to occur _ ABOR IDLE STATE RST INITiate NAME TRAN Y INITIATED STATE TRIGGER RECEIVED Yy OUTPUT CHANGES Figure 5 1 Model of Output Trigger System 41 5 Programming the DC Source Setting the Voltage and Current Trigger Levels You can program a trigger level or alternate value that the output voltage output current or output current limit function will go to when a trigger is received To use the output trigger function you must first specify a voltage or current trigger level that the output will go to once a trigger signal is received Once you program a trigger level and then trigger the output the output will stay at the triggered level until the output is reprogrammed Use the following commands to program an output trigger level VOLT TRIG lt n gt lt channel list gt CURR TRIG lt n gt lt channel list gt CURR LIM TRIG lt n gt lt channel list gt Once you have specified which function that you want to trigger you must then enable that function to respond to trigger commands Unless the function is enabled to respond to triggers nothing will happen even if you have programmed a trigger level for the function Use the following commands to enable a function to respond to triggers VOLT MODE STEP lt channel list
21. commands are available MEASure and FETCh MEASure commands trigger the acquisition of new data before returning the reading Measurement overflows return a reading of 9 91E 37 FETCh commands return a reading computed from previously acquired data If you take a voltage measurement you can fetch only voltage data If you take a current measurement you can fetch only current data Use MEASure when the measurement does not need to be synchronized with any other event Use FETCh when it is important that the measurement be synchronized with either a trigger or with a particular part of the output waveform Sense commands control the current measurement range the bandwidth detector of the dc source and the data acquisition sequence FETCh ARRay CURRent FETCh ARRay VOLTage These queries return an array containing either the digitized output current in amperes or output voltage in volts The data returned is the result of the last measurement command or acquisition trigger The data is valid until the next RST MEASure or INITiate command occurs Query Syntax FETCh ARRay CURRent DC lt channel list gt FETCh ARRay VOLTage DC lt channel list gt Parameters None Examples FETC ARR CURR 1 FETC ARR VOLT 1 Returned Parameters lt NR3 gt lt NR3 gt Related Commands SENS SWE TINT SENS SWE OFFS SENS SWE POIN FETCh CURRent FETCh VOLTage These queries return either the dc output current in amperes or output volt
22. data they only return the data that was acquired by the trigger Note that if you acquired voltage data you can only fetch voltage data Average Measurements To measure the average output voltage or current use MEAS VOLT lt channel list gt MEAS CURR lt channel list gt Average voltage and current is measured by acquiring a number of readings at the selected time interval applying the selected window function to the readings and averaging the readings Windowing is a signal conditioning process that reduces the error in average measurements made in the presence of periodic signals and noise Refer to the discussion of the Window functions later in this chapter and in chapter 6 The power on and RST sample interval and sweep size settings yield a data acquisition time of 152 microseconds per measurement 5 data points at 30 4us intervals Ripple rejection is a function of the number of cycles of the ripple frequency contained in the acquisition window More cycles in the acquisition window results in better ripple rejection The two methods of increasing data acquisition time is to either increase the number of power line cycles or increase the number of measurement samples and the time interval between samples 43 5 Programming the DC Source Power Line Cycles After a power on or RST the de source automatically makes measurements based on a 0 00912 power line cycles for 60 Hz line This results in a default measur
23. gt CURR MODE STEP lt channel list gt CURR LIM MODE STEP lt channel list gt In Step mode the triggered value becomes the immediate value when the trigger is received If the mode is set to Fixed nothing will happen when a trigger is received the immediate value remains in effect Enabling the Output Trigger System When the dc source is turned on the trigger subsystem is in the idle state In this state the trigger system is disabled ignoring all triggers Sending the following commands at any time returns the trigger system to the idle state ABOR RST The INITiate commands move the trigger system from the idle state to the initiated state This enables the de source to receive triggers To initiate the trigger system use INIT NAME TRAN After a trigger is received and the action completes the trigger system will return to the idle state Thus it will be necessary to enable the system each time a triggered action is desired Selecting the Output Trigger Source The trigger system is waiting for a trigger signal in the initiated state Before you generate a trigger you must select a trigger source To select GPIB bus triggers use TRIG TRAN SOUR BUS To select external triggers use TRIG TRAN SOUR EXT 42 Programming the DC Source 5 Generating Output Triggers After you have specified the appropriate trigger source you can generate triggers as follows GPIB Triggers Send one of the fo
24. overcome this limitation of the Rectangular window is to specify an integral number of power line cycles with SENSe SWEep NPLCycles before making a measurement Another way of dealing with ac line ripple is to use a Hanning window The Hanning window applies a cos weighting function to the data in the measurement buffer when calculating average measurements This attenuates the ac noise in the measurement window The best attenuation is achieved when at least three or more waveform cycles are in the measurement buffer Returning All Measurement Data From the Data Buffer The MEASure ARRay and FETCh ARRay queries return all data values of the instantaneous voltage or current buffer No averaging is applied only raw data is returned from the buffer The commands are MEAS ARR CURR lt channel list gt MEAS ARR VOLT lt channel list gt Triggered Measurements Use the measurement trigger system to synchronize the acquisition of measurements with either a BUS or an external trigger Use FETCh commands to return voltage or current information from the data acquired by the measurement system Briefly to make a triggered measurement 1 Select a sweep interval and sample size 2 Select the trigger source 3 Initiate the trigger system 4 Fetch the triggered measurements 45 5 Programming the DC Source Measurement Trigger Model Figure 5 3 is a model of the measurement trigger system The rectangular boxes represent states The a
25. sample points increases the accuracy of the measurement however the tradeoff is it takes a longer time to make the measurement NOTE The total number of data points cannot exceed 4096 This means that the count multiplied by the points in each measurement cannot exceed 4096 otherwise an error will occur 44 Programming the DC Source 5 Current Ranges The dc source has three current measurement ranges The command that controls the ranges is SENS CURR RANG lt value gt lt channel list gt Enter the value of the current that you expect to measure When the range is set to MAX the maximum current that can be measured is the maximum rating of the unit Other measurement ranges are Range Value to select range 0 5 A values greater than 0 015A 15 mA values greater than 0 0005A up to 0 015A 0 5 mA values less than and up to 0 0005A Window Functions The dc source lets you select from two measurement window functions Rectangular and Hanning To select a window function use SENS WIND HANN RECT At power on the dc source measurement window is Rectangular The Rectangular window calculates average measurements without any signal conditioning However in the presence of periodic signals such ac line ripple a Rectangular window can introduce errors when calculating average measurements This can occur due to the last partial cycle of acquired data when a non integral number of cycles of data has been acquired One way to
26. the CE Marking accordingly EMC information The product herewith complies with the requirements of the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly European Union As detailed in Electromagnetic Compatibility EMC Certificate of Conformance No TCF CC TCF 01 016 based on Technical Construction File TCF No ANJ13 dated 8 03 2001 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire ST7 1TL United Kingdom Safety information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and carries the CE marking accordingly Supplemental information The product conforms to the following safety standards IEC 1010 1 1990 A1 A2 EN 61010 1 1993 A2 UL 3111 1 1994 CSA C22 2 No 1010 1 1993 Lhe kell March 19 2001 Date Hank Kowalla Quality Manager at PPPGU For further information please contact your local Agilent Technologies sales office agent or distributor Authorized EU representative Agilent Technologies Deutschland GmbH Herrenberger Stra e 130 D71034 Boblingen Germany Acoustic Noise Information Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenlaminformationsverordnung vom 18 Januar 1991 Schalldruckpegel Lp lt 70 dB A Am Arbeitsplatz Normaler Betrieb Nach EN 27779 Typprtfung Manufacturer s Declarati
27. the High output terminal Jumper the Low sense terminal to the Low output terminal Connect the current input of the 3458A multimeter directly to output 1 Select the 0 5A range current measurement calibration for output 1 Select the calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Set the 3458A multimeter to the 1A range measure the output current and enter the data into the de source CAL CAL CAL CAL CAL CURR LIM POS 1 LEV P1 OPC DATA lt value gt LEV P2 OPC DATA lt value gt Program Commands CAL CURR MEAS 0 5 1 CAL LEV P1 OPC CAL DATA lt value gt WARNING Performance and Calibration Procedures 15mA Range Current Measurement Calibration Action Jumper the High sense terminal to the High output terminal Jumper the Low sense terminal to the Low output terminal Connect the current input of the 3458A multimeter directly to output 1 Select the 15mA range current measurement calibration for output 1 Select the calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Set the 3458A multimeter to the 10mA range measure the output current and enter the data into the dc source Action Jumper the High sense terminal to the High output terminal Jumper the Low sense terminal to the Low output terminal Co
28. the output as shown in Figure B 1c You do not need a shorting switch 10 Turn on the output and program the 0 5mA current readback range OUTP Measure the output current SENS MEAS 11 Set the ammeter to the 1mA range and record the output current reading on the ammeter The difference between the ammeter reading and the measurement query result should be within the limits specified Readback Accuracy 0 5mA Current Limit Current Priority Tests Current Programming and Readback Accuracy ON 1 CURR RANG 0 015 1 MEAS CURR 1 OFF 1 ON 1 CURR RANG 0 0005 1 CURR 1 NOTE The voltage limits in Current Priority Mode are not programmable Action Program Commands 1 Reset the de source and connect an ammeter directly across the HIand 9 RST LO terminals as shown in Figure B la RST resets the dc source to its default settings with the output off 2 Turn on the de source and program the Current Priority mode OUTP ON 1 The default output current is set to 0A SOUR FUNC MODE CURR 1 3 Set the ammeter to the 1A range and record the output current reading on the ammeter The reading should be within the limits specified in the performance test record card under Current Priority Programming Accuracy 0A 4 Program the output current to 0 5mA Measure the output current CURR 0 0005 1 5 Set the ammete
29. the transformer to the highest rated line voltage e g 127 Vac for 120 Vac nominal line voltage input Record the current reading on the ammeter high line value The difference between the low line and the high line values is the source effect voltage and should be within the limits listed in the performance test record card under Voltage Priority Source Effect Current Limit Voltage Priority Current Limit Source Effect 92 Action Connect the ac input of the de source to a variable voltage transformer or ac source Set the transformer to nominal line voltage Connect the output as shown in Figure B la with an ammeter directly across the Hi and Lo output terminals Turn on the de source and program the output voltage to the maximum negative value 10 25V and the current limit to 0 5A STAT OPER COND 1 Program Commands OUTP ON 1 VOLT 10 25 1 CURR LIM 0 5 1 STAT OPER COND 1 Program Commands OUTP ON 1 VOLT 10 25 1 CURR LIM 0 5 1 Performance and Calibration Procedures 3 Read back the N3280A status to be sure that it s in the CL mode This STAT OPER COND 1 query should return a Bit value of 4 for CL mode 4 Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 120 Vac nominal line voltage input Set the ammeter to the 1A range and record the current reading on the ammeter
30. up to 31 characters Command Syntax Parameters Examples Query Syntax Returned Parameters CALibrate LEVel CALibrate DATE lt date gt lt date gt CAL DATE 3 22 01 CALibrate DATE lt SRD gt CAL DATE 22 3 99 This command selects the next point in the calibration sequence P1 is the first calibration point P2 is the second calibration point Command Syntax Parameters Examples CALibrate PASSword CALibrate LEVel lt point gt Pi P2 CAL LEV P2 This command lets you change the calibration password A new password is automatically stored in nonvolatile memory and does not have to be stored with CALibrate SAVE The default password is the model number of the unit If the password is set to 0 password protection is removed and the ability to enter the calibration mode is unrestricted Command Syntax CALibrate PASSword lt NRf gt Parameters Examples Related Commands 58 lt model number gt default CAL PASS 1234 CAL SAV Language Dictionary 6 CALibrate SAVE This command saves any new calibration constants after a calibration procedure has been completed in nonvolatile memory If CALibrate STATe OFF is programmed without a CALibrate SAVE the previous calibration constants are restored Command Syntax CALibrate SAVE Parameters None Examples CAL SAVE Related Commands CAL PASS CAL STAT CALibrate STATe This command enables and disables calibration mode The calibration mode must be enab
31. with your unit contact your nearest Agilent Sales and Support Office to obtain the correct cord refer to the list at the back of this guide Check the line voltage rating label on the back of the unit to make sure that it agrees with your ac mains voltage Refer to appendix E if the voltage at your site is different from the voltage indicated on the unit Figure 2 2 identifies all rear panel connections on the de source OUTPUT 3 Loo OUTPUT PIN QUT Line select and Fusk 1 GUARD are inside Module 2 HIGH SENSE 3 HIGH OUTPUT 4 LOW OUTPUT 5 LOW SENSE 6 CHASSIS GROUND WARNING FOR CONTINUED FIRE PROTECTION USE OUTEDT OUTPUT 2 SPECIFIED LINE FUSE Figure 2 2 Rear Panel Connectors and Switches GPIB GPIB connector for computer connection connector Trigger Connector A 3 terminal trigger input connector Only the center and left most terminals are used Address Switch Switch to select GPIB address Refer to the end of this chapter Output Pin 1 Active guard Connectors 4 Pin 2 High sense Pin 3 High output Pin 4 Low output Pin 5 Low sense Pin 6 chassis ground connection Line AC line cord is installed here Also used to set the ac line voltage see Appendix E 21 2 Installation Output Connections Turn the unit off before connecting any wires Outputs 1 4 Disconnect the mating plug from the unit by pulling it straight back The output connectors o
32. 25 1 3 Note that the waveform on the oscilloscope should not exceed the peak to peak limit in the performance test record card under Voltage Priority PARD Voltage peak to peak 4 Disconnect the oscilloscope and connect an ac rms voltmeter in its place The rms voltage reading should be within the rms limit in the performance test record card for the appropriate model under Voltage Priority PARD Voltage rms 5 Program the output voltage to the maximum positive value 10 25V VOLT 10 25 1 and the current limit to 0 45A CURR TEIN 0 45 1 6 Read back the N3280A status to be sure that it s in the CL mode This STAT OPER COND 1 query should return a Bit value of 2 for CL mode If it is not in CL mode decrease the current limit setting slightly 7 Divide the voltage reading of the ac rms voltmeter by 20 the value of the load resistor The result should be within the limit in the performance test record card under Voltage Priority PARD Current Limit 8 Program the output voltage to the maximum negative value 10 25V VOLT 10 1 9 Read back the N3280A status to be sure that it s in the CL mode This woqar query should return a Bit value of 4 for CL mode OPER COND 1 If it is not in CL mode decrease the current limit setting slightly 10 Divide the voltage reading of the ac rms voltmeter by 20 the value of the load resistor The result should b
33. 3280A power supply requires an HP 3458 DMM or something with equivalent voltage and current measurement accuracy For all calibration steps connect the high sense terminal to the high output and the low sense terminal to the low output A general outline of the calibration procedure is as follows 1 Enable calibration by sending the CAL STATE ON lt password gt command The password argument is a number which is set at the factory to the model number of the power supply and can be changed by the user 2 Calibrate one or more subsystems using the commands given in the following sections Calibrate only one of the 4 output channels at a time The calibration commands accept only a single channel number for the channel list arguments 3 Whenever a subsystem s calibration is changed all subsystems listed below it must also be re calibrated However voltage and current subsystems are independent changing the calibration of one does not require re calibration of the other 4 As each subsystem s procedure is completed the instrument calculates new calibration constants and begins using them These constants are not saved in nonvolatile memory until the CAL SAVE command is given CAL SAVE can be given after each subsystem is done or given once after all subsystems are done 5 Disable calibration by sending CAL STATE OFF Any subsystems that were calibrated with a subsequent CAL SAVE revert to their previous calibration constants Note that R
34. 33 message structure 34 message unit 34 multiple commands 33 program message 34 references 31 response message 34 subsystem commands 32 53 SCPI commands at a glance 54 selftest errors 29 sense commands 60 SENS CURR RANG 61 SENS FUNC 62 SENS SWE NPLC 62 Index SENS SWE OFFS POIN 62 SENS SWE POIN 63 SENS SWE TINT 63 SENS WIND 63 sense connections 22 servicing operation status 52 servicing questionable status events 52 source commands 64 SOUR CURR IMM 65 SOUR CURR LIM IMM 65 SOUR CURR LIM BWID 65 SOUR CURR LIM MODE 66 SOUR CURR LIM TRIG 65 SOUR CURR MODE 66 SOUR CURR TRIG 65 SOUR DEL 66 SOUR DEL MODE 66 SOUR FUNC MODE 67 SOUR VOLT IMM 67 SOUR VOLT ALC BWID 67 SOUR VOLT MODE 68 SOUR VOLT PROT STAT 68 SOUR VOLT TRIG 67 specifications 79 SRD 36 stability 25 standard event status group 51 status bit configurations 50 status byte register 51 status commands 69 STAT OPER EVEN 69 STAT OPER COND 69 STAT OPER ENAB 69 STAT OPER NTR 70 STAT OPER PTR 70 STAT PRES 70 STAT QUES EVEN 70 STAT QUES COND 71 STAT QUES ENAB 71 STAT QUES NTR 71 STAT QUES PTR 71 subsystem commands syntax 54 suffixes 36 support rails 20 system commands 72 SYST ERR 72 SYST VERS 72 system errors 103 time interval 44 trigger commands 73 TRIG TRAN 74 TRIG TRAN SOUR 74 TRIG ACQ 73 TRIG ACQ SOUR 74 trigger conn
35. A If the dc source fails any of the tests or if abnormal test results are obtained after performing a calibration return the unit to an Agilent Technologies repair facility This appendix also includes calibration procedures for the Agilent N3280A Instructions are given for performing the procedures from a controller over the GPIB IMPORTANT Perform the Programming Accuracy and Readback Accuracy tests before calibrating your de source If the dc source passes the Programming Accuracy and Readback Accuracy tests the unit is operating within its calibration limits and does not need to be re calibrated Equipment Required The equipment listed in the following table or the equivalent to this equipment is required for the calibration and performance tests A test record sheet with specification limits when test using the recommended test equipment may be found at the back of this section Table B 1 Equipment Required Specifications Recommended Model Digital multimeter Resolution 10nV 1V Readout 8 1 2 Agilent 3458A or digits Accuracy 20 ppm equivalent Electronic load 20 V 5A minimum with transient capability Agilent N3300A and a a slew rate of 0 833A us or better mainframe with N3303A module 6063A B GPIB controller Full GPIB capabilities only required if you HP Series 200 300 or PC are calibrating the unit over the GPIB with GPIB capability 83 B Performance and Calibration Procedures Table B 1 Equip
36. A only supports channels 1 through 4 A maximum of 4 channels may be specified through a combination of single channels and ranges Query and measurement channel lists are order sensitive Results are returned in the order they are specified in the list NOTE When adding a channel list parameter to a query you must include a space white space between the query indicator and the channel list parameter Otherwise error 103 Invalid separator will occur 34 Introduction to Programming 4 Headers Headers also referred to as keywords are instructions recognized by the dc source Headers may be either in the long form or the short form In the long form the header is completely spelled out such as VOLTAGE STATUS and DELAY In the short form the header has only the first three or four letters such as VOLT STAT and DEL Query Indicator Following a header with a question mark turns it into a query VOLTage VOLTage TRIGgered Ifa query contains a parameter place the query indicator at the end of the last header VOLTage TRIGgered MAX 1 Message Unit Separator When two or more message units are combined into a compound message separate the units with a semicolon STATus OPERation 1 QUEStionable 1 Root Specifier When it precedes the first header of a message unit the colon becomes the root specifier It tells the command parser that this is the root or the top node of the command tree Message Term
37. ARD EVENT SERVICE STATUS STATUS BYTE REQUEST ENABLE OUTPUT QUEUE A 7 N EVENT ENABLE opc 14 aye 2 4 DDE 8 4 EXE 16 cme 5 32 PON 128 OPERATION STATUS IDENTICAL REGISTERS FOR EACH CHANNEL CONDITIONPTR NTR EVENT ENABLE SERVICE cv 2 1 REQUEST 1 2 2 GENERATION CL cL 2 4 4 cc 3 8 8 VL 4 16 16 yL 832 as orr 64 64 SAM AS CHAN 1 Figure 5 5 DC Source Status Model 49 5 Programming the DC Source Table 5 1 Bit Configurations of Status Registers it Operation Status Group The selected output is in constant voltage mode applies only in voltage priority mode The selected output is in positive current limit applies only in voltage priority mode The selected output is in negative current limit applies only in voltage priority mode The selected output is in constant current mode applies only in current priority mode The selected output is in positive voltage limit applies only in current priority mode The selected output is in negative voltage limit applies only in current priority mode The selected output is OFF Questionable Status Group The positive overvoltage protection has tripped The negative overvoltage protection has tripped PCLR No communication with the selected output OT The overtemperature protection has tripped UNR The output is unregulated OSC The oscillation protection has tripped MeasOvld Output measurement
38. D 10000 1 Loading Transient 7 te Unloading Transient VOLT ALC BWID 20000 1 VOLT ALC BWID 30000 1 95 B Performance and Calibration Procedures File Control Setup Measure Analyze Utilities Help 4 02 PM Figure B 2 Transient Waveform Voltage Priority Current Priority Transient Recovery Time This test measures the time for the output current to recover to within the specified value following a 1V change in the output voltage The test setup uses a 0 47uF capacitor across the output of the generator to form an approximate 25us time constant with the 50 ohm output of the function generator NOTE 96 Action Turn off the de source and connect the output as in Figure B 1f with the function generator across the HI and LO terminals Remember to connect the capacitor 0 47uF close to the function generator Keep all leads as short as possible Turn on the de source and program the Current Priority mode Program the current to zero amps Program the Function Generator as follows Frequency 400Hz to 1kHz Duty cycle 50 Wave shape 1V square wave Set the Tektronics current probe to measure current at 2mA div Adjust the oscilloscope for a waveform similar to that in Figure B The output current should return to within 1mA in less than 90us Check both loading and unloading transients by triggering on the positive and negative slope Record the voltage at time
39. EEE Std 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation Defines the technical details of the GPIB interface While much of the information is beyond the need of most programmers it can serve to clarify terms used in this guide and in related documents ANSITEEE Std 488 2 1987 IEEE Standard Codes Formats Protocols and Common Commands Recommended as a reference only if you intend to do fairly sophisticated programming Helpful for finding precise definitions of certain types of SCPI message formats data types or common commands The above two documents are available from the IEEE Institute of Electrical and Electronics Engineers 345 East 47th Street New York NY 10017 USA The WEB address is www ieee org SCPI References The following documents will assist you with programming in SCPI Standard Commands for Programmable Instruments Volume 1 Syntax and Style Standard Commands for Programmable Instruments Volume 2 Command References Standard Commands for Programmable Instruments Volume 3 Data Interchange Format Standard Commands for Programmable Instruments Volume 4 Instrument Classes To obtain a copy of the above documents contact Fred Bode Executive Director SCPI Consortium 8380 Hercules Drive Suite P3 Ls Mesa CA 91942 USA GPIB Capabilities of the DC Source All dc source functions except for setting the GPIB address are programmable over the GPIB The IEEE 488 2 capabilities o
40. It is a read write register NTR Filter STAT OPER NTR lt n gt lt channel list gt A negative transition filter that functions as described under STAT OPER NTR PTR commands in chapter 6 50 Programming the DC Source 5 Questionable Status Group The Questionable Status registers record signals that indicate abnormal operation As shown below the group consists of the same register types as the Status Operation group The outputs of the Questionable Status group are logically ORed into the QUEStionable summary bit 3 of the Status Byte register Condition QUES COND lt channel list gt A register that holds real time status of the circuits being monitored It is a read only register PTR Filter QUES PTR lt n gt lt channel list gt A positive transition filter that functions as described under STAT QUES NTR PTR commands in chapter 6 It is a read write register NTR Filter QUES NTR lt n gt lt channel list gt A negative transition filter that functions as described m under STAT QUES NTR PTR commands in chapter 6 It is a read write register Event QUES EVEN lt channel list gt A register that latches any condition that is passed lean through the PTR or NTR filters It is a read only register that is cleared when read Enable T QUES ENAB lt n gt lt channel list gt A register that functions as a mask for enabling specific bits from the Event register It is a read write register
41. Overvoltage Protection Output Current Output Mode Oscillation Protection Triggering Output Changes Output Trigger Model Setting the Voltage and Current Trigger Levels Enabling the Output Trigger System Selecting the Output Trigger Source Generating Output Triggers Making Measurements Average Measurements Power Line Cycles Measurement Samples and Time Interval Current Ranges Window Functions Returning All Measurement Data From the Data Buffer Triggered Measurements Measurement Trigger Model Enabling the Measurement Trigger System Selecting the Measurement Trigger Source Selecting the Sensing Function Output Settling Delay Generating Measurement Triggers Pre trigger and Post trigger Data Acquisition Programming the Status Registers Operation Status Group Questionable Status Group Standard Event Status Group Status Byte Register Determining the Cause of a Service Interrupt Servicing Operation Status and Questionable Status Events LANGUAGE DICTIONARY Introduction Subsystem Commands Common Commands Programming Parameters SCPI Programming Commands At a Glance Calibration Commands CALibrate CURRent CALibrate CURRent LIMit POSitive CALibrate CURRent LIMit NEGative CALibrate CURRent MEASure CALibrate DATA CALibrate DATE CALibrate LEVel CALibrate PASSword CALibrate SAVE CALibrate STATe CALibrate VOLTage Measurement Commands FETCh ARRay CURRent FETCh ARRay VOLTage FETCh CURRent FETCh VOLTage
42. PUT 1 MATING PLUG SHOWN TIGHTEN e l L LOCKING SCREW 2 Hsen Tl INSERT mes A TEST FIXTURE Figure 2 5 Guard Connections for Test Fixtures 24 Installation 2 Maintaining Stability In voltage priority mode the constant voltage loop has the following three compensation bandwidths 30kHz 20 kHz and 10 kHz In current limit operation only two compensation bandwidths are available 30kHz and 10 kHz If the output of your unit is being shut down by the oscillation protection circuit because of long load wires or a high Q load impedance you can reprogram the output compensation bandwidth to try and eliminate the oscillation As shipped from the factory the compensation bandwidth is set to 30 kHz OVP Considerations CAUTION Disabling the OVP protection circuit may cause excessive output voltages such as can occur if remote sense leads are shorted to damage the equipment under test The dc source is shipped from the factory with its overvoltage protection circuit enabled You can disable the OVP circuit using the VOLTage PROTection STATe command as explained in chapter 6 The overvoltage circuit automatically turns the output off and opens the output relays if the output voltage exceeds 11 5V 0 3V or 11 5V 40 3V External Trigger Connections This rear panel connector has an external trigger input The trigger input pin is normally at a TTL high level To generate a trigger yo
43. RECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contacts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies full line of Support Programs Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Agilent Technologies assumes no liability for the customer s failure to comply with these requirements GENERAL This product is a Safety Class 1 instrument provided with a protective earth terminal The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions Any LEDs used in this product are Class 1 LEDs as per IEC 825 1 ENVIRONMENTAL CONDITIONS This instrument is intended for indoor use in an installation category II pollution degree 2 environment It is designed to operate at a maximum relative humidity of 95 and at altitudes of up to 4500 meters Refer to the specifications tables for the ac mains vol
44. ST also sets the calibration state to OFF Enable Calibration Mode Action Program Commands 1 Reset the unit RST 2 Enable calibration mode If the password is incorrect an error occurs CAL STAT ON 0 Voltage Priority Mode Programming and Measurement Calibration Action Program Commands I Jumper the High sense terminal to the High output terminal Jumper the Low sense terminal to the Low output terminal Connect the voltage input of the 3458A multimeter directly to output 1 2 Select voltage calibration for output 1 CAL VOLT 1 3 Select the first calibration point OPC prevents processing of all CAL LEV P1 OPC subsequent commands to ensure that the output is stable 4 Set the 3458A multimeter to the 10V range measure the output CAL DATA lt value gt voltage and enter the data into the dc source 5 Select the second calibration point OPC prevents processing of all CAL LEV P2 OPC subsequent commands to ensure that the output is stable 6 Measure the output voltage and enter the data into the de source CAL DATA lt value gt 99 B Performance and Calibration Procedures Negative Current Limit Calibration Action Jumper the High sense terminal to the High output terminal Jumper the Low sense terminal to the Low output terminal Program Commands Connect the current input of the 3458A multimeter directly to output 1 Select negative current limit cali
45. USER S GUIDE Agilent Technologies Model N3280A Component Test DC Source See Agilent Technologies Agilent Part No 5964 8248 Microfiche No 5964 8249 June 2001 Warranty Information CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery Agilent Technologies software and firmware products which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent does not warrant that the operation for the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be re
46. Vac 60A 120 Vac 104 127 Vac 53A 220 Vac 191 233 Vac 40A 230 Vac 207 253 Vac 36A l With no load and current limit set to 0 5125A program voltage from 10V to OV 12 With 20 ohm load resistor and voltage set to 10 25V program current limit from 0 5A to 0A 13 With 20 ohm load resistor and voltage set to 10 25V program current limit from 0 5A to 0A 14 With 1k load resistor program current from 0 5mA to 0 5mA Measure time from 0 4mA to 0 4mA 15 Output is shut down and output relays are opened 16 Measurement taken with ammeter having approx 1k shunt resistance and 10Hz to 1kHz bandwidth Input ac is 120V 60Hz 81 A Specifications o a 1 3 OUTPUT IMPEDANCE ohms o N a PHASE degrees waa Toy Uag IO 10k 10k FREQUENCY Hz FREQUENCY Hz VOLTAGE PRIORITY bandwidth 30kHz CURRENT LIMIT bandwidth 30kHz 1 A o a 1 3 e 7 lt 2 Ww O z 3 0 25 HH mi a Z E gt a E gt PHASE degrees
47. Voltage 0V 2mV Voltage 10V Vout 12mV Voltage 10V Vout 12mV 0 5A range current Tout 0 7mA 0 5A range current Tout 0 7mA 15mA range current Tout 15uA 15mA range current Tout 15uA 0 5mA range current Tout 0 7uA 0 5mA range current Tout 0 7uA 2mV 10 012 V 10 012 V 1 051mA 0 50055 A 1 051mA 0 50055 A Load Effect Voltage Current limit Current limit Source Effect Voltage 200uV Current limit 10uA Current limit 10uA PARD Ripple and Noise Voltage rms Voltage peak to peak Current limit rms Transient Response Time Low 10kHz Med 20kHz High 30kHz CURRENT PRIORITY TESTS Programming Accuracy DMM readings Current 0A IA Current 0 5mA 0 0004985 A 0 0005015 A Current 0 5mA 0 0004985 A 0 0005015 A Load Effect Current 25nA t 25nA 1A Source Effect PARD Ripple and Noise Current rms 1 5uA Transient Response Time 98 Performance and Calibration Procedures Performing the Calibration Procedure You can only calibrate the dc source by using SCPI commands within your controller programming statements The SCPI calibration commands are explained in chapter 8 Calibration error messages that can occur during GPIB calibration are shown in table B 3 Table B 1 lists the equipment required for calibration Figure B 1 shows the test setup Calibrating the N
48. a shorting switch Turn on the output and program the 15mA current readback range Measure the output current Set the ammeter to the 10mA range and record the output current reading on the ammeter The difference between the ammeter reading and the measurement query result should be within the limits specified Readback Accuracy 15mA Current Limit Turn off the output and connect a 20k ohm resistor in series with the ammeter across the output as shown in Figure B 1c You do not need a shorting switch Turn on the output and program the 0 5mA current readback range Measure the output current Set the ammeter to the 1mA range and record the output current reading on the ammeter The difference between the ammeter reading and the measurement query result should be within the limits specified Readback Accuracy 0 5mA Current Limit Negative Current Limit CL Action Reset the de source and connect an ammeter directly across the HI and LO terminals as shown in Figure B 1la RST resets the de source to its default settings with the output off Turn on the de source and program the output voltage to 10 volts The default output current limit is set to 1mA Set the ammeter to the 1mA range and record the output current reading on the ammeter The ammeter reading should be within the limits specified in the performance test record card under Voltage Priority Programming Accuracy 1mA Current limit Program the output cur
49. a slightly higher value resistor so that the output current drops slightly Record the output voltage reading on the DVM full load value The difference between these two DVM readings is the Load Effect voltage and should be within the limits listed in the performance test record card under Voltage Priority Load Effect Voltage 89 B Performance and Calibration Procedures Voltage Priority Current Limit Load Effect This test measures the change in output current resulting from a change in output voltage from about zero volts to about 10 volts Action Program Commands 1 Turn off the dc source and connect the output as shown in Figure B le RST with an ammeter in series with a 20 ohm load resistor across the Hi and Lo output terminals Also connect a shorting switch across the resistor 2 Start with a short across the output switch closed Turn on the dc OUTP ON 1 source and program the output voltage to the maximum positive value VOLT 10 25 1 s 10 25V and the current limit to 0 5A CURR LIM 0 5 1 3 Set the ammeter to the 1A range and record the output current reading on the ammeter shorted output value 4 Remove the short open the switch from the output of the dc source 5 Read back the N3280A status to be sure that it s in the CL mode STAT OPER COND 1 This query should return a Bit value of 2 for CL mode If it is not in CL mode decrease the current limit set
50. afety Considerations Options and Accessories Description Remote Programming Output Characteristics Voltage Priority Operation Current Priority Operation Measurement Characteristics Start of a Measurement INSTALLATION Inspection Damage Packaging Material Additional Items Cleaning Location Bench Operation Rack Mounting Power Connections Connect the Power Cord Output Connections Outputs 1 4 Current Ratings Voltage Drops and Lead Resistance Coaxial Guard Connections Maintaining Stability OVP Considerations External Trigger Connections Computer Connections GPIB Interface GPIB Address TURN ON CHECKOUT Front Panel Description Checkout Procedure In Case of Trouble Selftest Error Messages Runtime Error Messages Line Fuse AADUN INTRODUCTION TO PROGRAMMING External References GPIB References SCPI References GPIB Capabilities of the DC Source Introduction to SCPI Conventions Used in This Guide Types of SCPI Commands Multiple Commands in a Message Moving Among Subsystems Including Common Commands Using Queries Types of SCPI Messages The Message Unit Channel List Parameter Headers Query Indicator Message Unit Separator Root Specifier Message Terminator SCPI Data Formats Numerical Data Formats Suffixes and Multipliers Response Data Types SCPI Command Completion Using Device Clear PROGRAMMING THE DC SOURCE Introduction Programming the Output Power on Initialization Enabling the Output Output Voltage
51. age in volts The data returned is the result of the last measurement command or acquisition trigger The data is valid until the next RST MEASure or INITiate command occurs Query Syntax MEASure SCALar CURRent DC lt channel list gt FETCh SCALar CURRent DC lt channel list gt Parameters None Examples MEAS CURR 1 FETC CURR DC 1 Returned Parameters lt NR3 gt lt NR3 gt Related Commands MEAS VOLT MEAS CURR 60 Language Dictionary 6 MEASure ARRay CURRent MEASure ARRay VOL Tage These queries initiate and trigger a measurement and return an array containing either the digitized output current in amperes or output voltage in volts The output voltage or current is digitized whenever a measurement command is sent or an acquisition trigger occurs The time interval is set by SENSe SWEep TINTerval The position of the trigger relative to the beginning of the data buffer is determined by SENSe SWEep OFFSet The number of points returned is set by SENSe SWEep POINts NOTE You can specify an optional maximum value parameter The dc source will select the proper current range to measure the maximum current Query Syntax Parameters Examples Returned Parameters Related Commands MEASure ARRay CURRent DC lt maximum value gt lt channel list gt MEASure ARRay VOLTage DC lt channel list gt None MEAS ARR CURR 0 1 1 lt NR3 gt lt NR3 gt SENS SWE TINT SENS SWE OFFS SENS
52. ared The dc source is prepared to accept a new command string The following statement shows how to send a device clear over the GPIB interface using Agilent BASIC CLEAR 705 IEEE 488 Device Clear The following statement shows how to send a device clear over the GPIB interface using the GPIB command library for C or QuickBASIC IOCLEAR 705 37 Programming the DC Source Introduction This chapter contains examples on how to program your dc source Simple examples show you how to program output voltage and current functions internal and external triggers measurement functions the status and protection functions ooo NOTE The examples in this chapter show which commands are used to perform a particular function but do not show the commands being used in any particular programming environment Programming the Output Power on Initialization When the dc source is first turned on it wakes up with the output state set to OFF In this state the output voltage is set to 0 The following commands are given implicitly at power on RST SRE 0 STAT PRES CLS ESE 0 RST is a convenient way to program all parameters to a known state Refer to the Common Commands section in chapter 6 for a complete description of the above commands Enabling the Output To enable all four outputs use the command OUTP ON 1 4 or OUTP ON 1 2 3 4 To enable only outputs 1 and 3 use the command OUTP ON 1 3 Output Voltage
53. asurement calculations in the presence of periodic signals such ac line ripple The Hanning window multiplies each point in the measurement sample by the function cosine RECTangular NOTE A window that returns measurement calculations without any signal conditioning Neither window function alters the instantaneous voltage or current data returned in the measurement array Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters SENSe WINDow TYPE lt type gt HANNing RECTangular RECTangular SENS WIND RECT SENSe WINDow TY PE lt CRD gt 63 6 Language Dictionary Output Commands Output commands consist of output and source commands Output commands enable the output and oscillation functions Source commands program the actual output voltage and current settings OUTPut This command enables or disables the dc source output The state of a disabled output is a condition of zero output voltage and a model dependent minimum source current see RST The output and sense relays are closed when the output is enabled and opened when the output is disabled The query returns 0 if the output is off and 1 if the output is on Command Syntax OUTPut STATe lt bool gt lt channel list gt Parameters 0 OFF 1 ON RST Value OFF Examples OUTP ON 1 4 Query Syntax OUTPut STATe lt channel list gt Returned Parameters lt NR1 gt 0 1 OUTPut OSCProtect This command ena
54. bles or disables the oscillation protection on the selected output Command Syntax OUTPut OSCProtect STATe lt bool gt lt channel list gt Parameters 0 OFF 1 ON RST Value ON Examples OUTP OSCP ON 1 4 Query Syntax OUTPut OSCProtect STATe lt channel list gt Returned Parameters lt NR1 gt 0 1 OUTPut PROTection CLEar This command clears the latch that disables the output when an overvoltage overtemperature or oscillation status condition is detected All conditions that generate the fault must be removed before the latch can be cleared The output is then restored to the state it was in before the fault condition occurred Command Syntax OUTPut PROTection CLEar lt channel list gt Parameters None Examples OUTP PROT CLE 1 4 64 Language Dictionary 6 SOURce CURRent IMMediate SOURce CURRent TRIGgered These commands set the immediate and the pending triggered current level of the dc source They only apply in current priority mode The immediate level is the output current setting The pending triggered level is a stored value that is transferred to the output when a trigger occurs To respond to a trigger the SOUR CURR MODE must be set to STEP and the trigger system must be initiated Command Syntax Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands SOURce CURRent LEVel IMMediate AMPLitude lt Nrf gt lt channel list gt
55. bool gt is the protection state 0 OFF 1 ON If the output of your unit is being shut down by the oscillation protection circuit you can reprogram the output compensation bandwidth to try and eliminate the oscillation This can be especially effective if capacitive loads or long load leads are causing the output to oscillate You can program the output compensation to operate in a lower bandwidth using the following command VOLT ALC BWID lt n gt lt channel list gt where lt n gt is one of 3 bands 30000 20000 10000 If your unit is being operated in current limit your can select from one of two compensation bands using the following command CURR LIM BWID lt n gt lt channel list gt where lt n gt is one of 2 bands 30000 10000 NOTE If the output is on programming a different compensation band will cause the output to cycle OFF then ON Triggering Output Changes The dc source has two independent trigger systems One is used for triggering output changes and the other is used for triggering measurements This section describes the output trigger system The measurement trigger system is described under Triggering Measurements Briefly to generate an output trigger 1 Program the triggered output level voltage current or current limit 2 Set the triggered function mode to STEP 3 Initiate the trigger system Output Trigger Model Figure 5 1 is a model of the output trigger system The rectangular
56. bration for output 1 Select the first calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Set the 3458A multimeter to the 1A range measure the output current and enter the data into the dc source Select the second calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Measure the output current and enter the data into the de source Positive Current Limit Calibration Action Jumper the High sense terminal to the High output terminal Jumper the Low sense terminal to the Low output terminal CAL CAL CAL CAL CAL CURR LIM NEG 1 LEV P1 OPC DATA lt value gt LEV P2 OPC DATA lt value gt Program Commands Connect the current input of the 3458A multimeter directly to output 1 Select positive current limit calibration for output 1 Select the first calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Set the 3458A multimeter to the 1A range measure the output current and enter the data into the dc source Select the second calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Measure the output current and enter the data into the de source 0 5A Range Current Measurement Calibration 100 Action Jumper the High sense terminal to
57. by query statements may take either of the following forms depending on the length of the returned string lt CRD gt Character Response Data Permits the return of character strings lt AARD gt Arbitrary ASCII Response Data Permits the return of undelimited 7 bit ASCII This data type has an implied message terminator lt SRD gt String Response Data Returns string parameters enclosed in double quotes SCPI Command Completion SCPI commands sent to the dc source are processed either sequentially or in parallel Sequential commands finish execution before a subsequent command begins Parallel commands allow other commands to begin executing while the parallel command is still executing Commands that affect trigger actions are among the parallel commands Following is a list of parallel commands A user should use some form of synchronization before assuming that these commands have completed OUTPUT STATE INITIATE VOLT OUTPUT PROTECTION CLEAR CURR FUNC MODE CURR LIM VOLT ALC BWIDTH NOTE The power supply already provides automatic source settling delay for the special case of VOLT CURR or CURR LIM followed by a measure query so it is not necessary to use WAI before a measure if the only pending operations are in this group The WAI OPC and OPC common commands provide different ways of indicating when all transmitted commands including any parallel ones have completed their operations The syntax and pa
58. can only program the dc source from a GPIB controller when performing the tests The test procedures are written assuming that you know how to program the dc source remotely from an GPIB controller Also when performing the verification tests from a GPIB controller you may have to consider the relatively slow settling times and slew rates of the dc source as compared to computer and system voltmeters Suitable WAIT statements can be inserted into the test program to give the dc source time to respond to the test commands Test Setup OUTPUT 1 MATING PLUG SHOWN ae L He A Hsen Hi Lo Lsen S Hsen Hi Lo Lsen Hsen Hi Lo Lsen T Toe 7 oor og ogg Z DC voltmeter or DC ammeter E 5 or Scope DC voltmeter DC ammeter E i L Lg Hsen Hi Lo tsen Hsen Hi Lo Lsen J 2 Hsen Hi Lo Lsen cal cal aa iPr dP I boy Current Probe optional BRA Current ga Probe Function Generator or RMS meter Figure B 1 Verification and Calibration Test Setup 85 B Performance and Calibration Procedures Voltage Priority Tests Voltage Programming and Readback Accuracy These tests verify that the voltage programming and GPIB readback functions are within specifications Action Reset the dc source and connect a DVM as shown in Figure B 1la Connect the DVM directly across the HI and LO s
59. ch positions 1 eee Handle 0 GPIB Switch Setting Address 1 Address 4 3 N TO GCG T O T Oa Q Pere Re Re OOO COIN to et SS et et oo cooocooooco eo Se ee ae a SS Sere o5 Do ooje o m omom ojo 0 1 2 3 4 5 6 7 26 Turn On Checkout Front Panel Description a te Agilent Technologies tl YY Line Switch Unit Indicators Channel Indicators N3280A 10V 0 5A Component Test DC Source B Wy fly yy ye YY 3 oo 4 1 2 MW Q KARE J D E Figure 3 1 Front Panel Overall View AC mains power switch Unit indicators light to indicate the following operating conditions Power The dc source is turned on Active The dc source is addressed to talk or listen Error There is a message in the SCPI error queue Channel indicators light to indicate the following channel conditions On The specified output channel is enabled Prot The specified output channel has entered protection mode due to Overtemperature Overvoltage Oscillation protect or Power clear Query the status registers of the affected channel to determine which protection feature is tripped 27 3 Turn On Checkout Checkout Procedure Successful tests in this chapter provide a high degree of confidence that your unit is operating properly Complete performance tests are given in Appendix B NOTE To perform the checkout procedure you will need a computer with a GPIB interface You wi
60. circuit If capacitive loads cause the output to oscillate use this command to select a lower compenstion band Note that if the output is on changing the compensation will cause the output to cycle OFF then ON The following compensation bandwidths may be programmed 30 kHz or 10 kHz Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters SOURce CURRent LIMit B WIDth lt Nrf gt lt channel list gt 10000 30000 30000 CURR LIM BWID 10000 1 SOURce CURRent LIMit BWIDth lt channel list gt lt NR3 gt 65 6 Language Dictionary SOURce CURRent MODE SOURce CURRent LIMit MODE These commands determine what happens to the output current and current limit during a triggered event FIXed STEP The output current and output current limit is unaffected when a trigger occurs The output current is set by the CURR TRIG value when a trigger occurs The current limit is set by the CURR LIM TRIG value when a trigger occurs SOURce CURRent MODE lt mode gt lt channel list gt SOURce CURRent LIMit MODE lt mode gt lt channel list gt Command Syntax Parameters FIXed STEP RST Value FIXed Examples CURR MODE FIX 1 CURR LIM MODE FIX 1 Query Syntax SOURce CURRent MODE lt channel list gt SOURce CURRent LIMit MODE lt channel list gt Returned Parameters SOURce DELay lt CRD gt This command sets the delay when SOUR DEL MODE is set to
61. dow 45 message terminator 35 end or identify 35 newline 35 message unit separator 35 model differences 14 MSS bit 51 multipliers 36 N numerical data formats 35 O operation status group 50 optional header example 33 options 14 oscillation protection 41 ouptut trigger generating 43 output compensation 25 connections 22 connector 19 output characteristic 15 16 output commands 64 OUTP 64 OUTP OSCP 64 OUTP PROT CLE 64 output connector 21 output mode 40 output queue 51 output trigger initiating 42 setting 42 source 42 output trigger system model 41 OVP circuit 25 disable 25 PARD 94 95 performance equipment 83 setup 85 performance test form 97 post event triggering 48 power cord 19 21 power line cycles 44 power on initialization 39 pre event triggering 48 print date 6 programming 85 programming parameters 53 programming status registers 49 Q queries 33 query indicator 35 questionable status group 51 R rack mount kit 14 rack mounting 20 readback accuracy 86 rear panel connections 21 Rectangular 45 63 remote programming 14 remote sensing with test fixture 23 repacking 19 returning voltage or current data 45 root specifier 35 RQS bit 51 safety class 13 summary 3 safety warning 3 SCPI command completion 36 command syntax 53 command tree 32 common commands 32 device clear 37 header path
62. e Calibrate positive current limit Calibrate negative current limit Calibrate high and medium current measurement range Enters the calibration value Sets the calibration date Advance to next calibration step P1 P2 Set numeric calibration password Save new cal constants in non volatile memory Enable or disable calibration mode Calibrate output voltage and voltage measurement range Enable the named trigger system TRANsient ACQuire Returns the digitized instantaneous current Returns the digitized instantaneous voltage Returns output current dc measurement Returns output voltage dc measurement Digitizes and returns the instantaneous output current Digitizes and returns the instantaneous output voltage Digitizes and returns average dc output current Digitizes and returns average dc output voltage Enables disables the selected de source output Enables disables oscillation protection on the selected output Reset latched protection Selects the current measurement range Configures the measurement sensor VOLTage CURRent Sets the number of ac power line cycles Defines the trigger offset in the measurement sweep Defines the number of data points in the measurement Sets the measurement sample interval Sets measurement window function HANNing RECTangular Language Dictionary 6 Table 6 1 Subsystem Commands Syntax continued SOURce CURRent LEVel IMMediate AMPLitude lt n gt
63. e Operation Enable and Operation Event registers to cause the following actions When a bit in the Operation NTR register is set to 1 then a 1 to 0 transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set When a bit of the Operation PTR register is set to 1 then a 0 to 1 transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set Ifthe same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Operation Condition register sets the corresponding bit in the Operation Event register Ifthe same bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Operation Condition register can set the corresponding bit in the Operation Event register Command Syntax STATus OPERtion NTRansition lt NRf gt lt channel list gt STATus OPERtion PTRansition lt NRf gt lt channel list gt Parameters 0 to 32767 Preset Value NTR register 0 PTR register 32767 Examples STAT OPER NTR 32 1 STAT OPER PTR 1312 1 Query Syntax STAT OPER NTR lt channel list gt STAT OPER PTR lt channel list gt Returned Parameters lt NR 1 gt register value STATus PRESet This command sets all defined bits in the Status Subsystem PTR registers and clears all bits in the subsytem NTR and Enable registers Command Syntax STATus PRESet Para
64. e dc source Unless otherwise noted specifications are warranted at 25 C 5 C after a 30 minute warm up period Sense terminals must be connected to their respective output terminals Table A 1 Specifications Voltage Priority Current Priority Output Ratings Voltage 10 25V to 10 25V 8V to 8V min with full resistive load refer to derating 11 25V to 11 25V max with no load 0 5125 mA to 0 5125 mA N A N A N A 0 1 1 A 0 1 2mV 5 points 0 1 200nA 1 PLC 0 1 200nA 1 PLC 0 1 200nA 1 PLC characteristic Programming Accuracy Readback Accuracy Ripple and Noise In the range of 20 Hz to 20 MHz Load Effect Change from no load to full load or full load to no load by varying a resistive load Source Effect change in output voltage or current for any line change within ratings Output Transient Response Voltage accuracy specification in voltage priority mode guaranteed between 10 25V to 10 25V 0 5A current range accuracy specification Current Voltage Current Limit Current Limit Current Voltage 0 5A Curr Range 15mA Curr Range 0 5mA Curr Range Voltage rms Voltage p p Current Limit rms Current rms Voltage Current Limit Current Limit Current Voltage Current Limit Current Limit Current Voltage 10kHz 20kHz 30kHz Current 0 5125A to 0 5125A 0 1 2mV 0 1 50uA 0 1 50uA N A 0 1 2mV
65. e of 8 for CC mode 7 Record the output current reading on the ammeter full load current value The difference between the two current readings is the Load Effect current and should be within the limits listed in the performance test record card for the appropriate model under Current Priority Load Effect Current Source Effect Tests These tests measure the change in output voltage or current that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications The tests should all be done at 60Hz line frequency Voltage Priority Constant Voltage Source Effect Action Program Commands 1 Connect the ac input of the de source to a variable voltage transformer or ac source Set the transformer to nominal line voltage Connect the output as shown in Figure B 1b with a 20 ohm resistor or an electronic load across the output terminals and a DVM across the Hi and Lo sense terminals 2 Turn on the de source program the output voltage to the full scale value OUTP ON 1 10 0V and the current limit to the maximum value 0 5125A VOLT 10 1 CURR LIM 0 5125 1 3 Ifyou are using an electronic load adjust it for the full scale output current 0 5A 91 B Performance and Calibration Procedures Read back the N3280A status to be sure that it s in the CV mode This query should return a Bit value of 1 for CV mode If it is not in CV mode
66. e usual parameter types to specify a channel list The notation 1 3 specifies a channel list that includes channels 1 2 and 3 The notation 1 3 specifies a channel list that includes only channels 1 and 3 Computer font is used to show program lines in text TRIGger ACQuire SOURce BUS shows a program line Types of SCPI Commands SCPI has two types of commands common and subsystem Common commands generally are not related to specific operation but to controlling overall dc source functions such as reset status and synchronization All common commands consist of a three letter mnemonic preceded by an asterisk RST IDN SRE 8 Subsystem commands perform specific de source functions They are organized into an inverted tree structure with the root at the top The following figure shows a portion of a subsystem command tree from which you access the commands located along the various paths You can see the complete tree in Appendix D 32 OUTPut _ STATe __ 0SCProtect _ STATe PROTection STATus _ OPERation __ EVEN CONDition Figure 4 1 Partial Command Tree Introduction to Programming 4 Multiple Commands in a Message Multiple SCPI commands can be combined and sent as a single message with one message terminator There are two important considerations when sending several c
67. e voltage input Record the current reading on the ammeter high line value 6 The difference between the low line and the high line values is the source effect current and should be within the limits listed in the performance test record card under Current Priority Source Effect Current 93 B Performance and Calibration Procedures Ripple and Noise Tests Voltage Priority 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 PARD is specified as the rms or peak to peak output voltage in the frequency range specified in Appendix A Action Program Commands 1 Turn off the dc source and connect the output as shown in Figure B 1d RST to an oscilloscope ac coupled between the HI and LO terminals You can use the Model URE3 P P Voltmeter in place of the scope Remember to include a 50 ohm series resistor at the dc source end of the cable Also connect a 20 ohm load resistor across the HI and LO terminals Set the scope s bandwidth limit to 20 MHz Use shielded cable lt 1 meter in length if possible Attach the cable as close to the de source connector as possible 2 Turn on the dc source and program the Voltage Priority mode this is the OUTP ON 1 default mode Program the output voltage to the full scale value ee 10 1 10 0V and the current limit to the maximum value 0 5125A CURR LIM 0 51
68. e when all pending operations are completed Unlike OPC OPC prevents processing of all subsequent commands It is intended to be used at the end of a command line so that the application program can then monitor the bus for data until it receives the 1 from the de source Output Queue Command Syntax OPC Parameters None Query Syntax OPC Returned Parameters lt NRI gt 1 Related Commands OPC TRIG WAI OPT This query requests the dc source to identify any options that are installed Options are identified by number A 0 indicates no options are installed Query Syntax OPT Returned Parameters lt AARD gt 76 Language Dictionary 6 RST This command resets the dc source to a factory defined state as defined in the following table RST also forces an ABORt command Table 6 7 RST Settings CAL STAT SOUR CURR LIM OUTP SOUR CURR LIM TRIG OUTP OSCP ON SOUR CURR LIM BWID SENS CURR RANG 5 SOUR CURR LIM MODE SENS FUNC VOLT SOUR FUNC MODE SENS SWE NPLC 00912 60 Hz SOUR DEL 0076 50 Hz SOUR DEL MODE SENS SWE POIN 5 SOUR VOLT ALC BWID SENS SWE OFFS POIN 0 SOUR VOLT SENS SWE TINT 30 4E 6 SOUR VOLT TRIG SENS WIND RECTangular SOUR VOLT MODE SOUR CURR 0 SOUR VOLT PROT STAT SOUR CURR TRIG 0 TRIG ACQ SOUR SOUR CURR MODE FIXed TRIG SOUR Command Syntax RST Parameters None SRE This command sets the condition of the Service Request Enable Register This register determ
69. e within the limit in the performance test record card under Voltage Priority PARD Current Limit 94 Performance and Calibration Procedures Current Priority Ripple and Noise NOTE The voltage limits in Current Priority Mode are not programmable Action Turn off the de source and connect the output as shown in Figure B 1d to an ac rms voltmeter Remember to include a 50 ohm series resistor at the dc source end of the cable Also connect a 16k ohm load resistor across the HI and LO terminals Turn on the de source and program the Current Priority mode Program the current to the maximum value 0 5mA Read back the N3280A status to be sure that it s in the CC mode This query should return a Bit value of 8 for CC mode Divide the voltage reading ac rms voltmeter by 16k the value of the load resistor The result should be within the limit in the performance test record card under Current Priority PARD Current Action Turn off the dc source and connect the output as in Figure B le with the oscilloscope across the HI and LO sense terminals Remember to connect the RC network 1OUF amp 0 2 ohm Turn on the de source and program the Voltage Priority mode this is the default mode Program the output voltage to the full scale value 10 0V the current to the maximum value 0 5A and the bandwidth to 10kHz Program the Electronic Load as follows Input current 0 25A Transient current level 0 5A Transient frequ
70. eared Command Syntax CLS Parameters None ESE This command programs the Standard Event Status Enable register bits The programming determines which events of the Standard Event Status Event register see ESR are allowed to set the ESB Event Summary Bit of the Status Byte register A 1 in the bit position enables the corresponding event All of the enabled events of the Standard Event Status Event Register are logically ORed to cause the Event Summary Bit ESB of the Status Byte Register to be set The query reads the Standard Event The query reads the Standard Event Status Enable register Table 6 6 Bit Configuration of Standard Event Status Enable Register Biposto 7 6 s 4 3 2 1 o BitName pon o cw exe pve que o orc Biweigm 128 o 2 w s 4 2 i PON Power on has occurred DDE Device dependent error CME Command error QUE Query error EXE Execution error OPC Operation complete Command Syntax ESE lt NRf gt Parameters 0 to 255 Power On Value 0 Examples ESE 129 Query Syntax ESE Returned Parameters lt NR 1 gt register value Related Commands ESR PSC STB ESR This query reads the Standard Event Status Event register Reading the register clears it The bit configuration is the same as the Standard Event Status Enable register see ESE Query Syntax ESR Parameters None Returned Parameters lt NR1 gt register binary value Related Command
71. ector 25 trigger offset 48 triggering output changes 41 types of SCPI commands 32 113 Index voltage 39 protection 40 voltage priority 15 voltage programming 86 114 W waiting for measurement results 48 warranty 2 wire current ratings 23 Agilent Sales and Support Office For more information about Agilent Technologies test and measurement products applications services and for a current sales office listing visit our web site http www agilent com find tmdir You can also contact one of the following centers and ask for a test and measurement sales representative United States Agilent Technologies Test and Measurement Call Center P O Box 4026 Englewood CO 80155 4026 tel 1 800 452 4844 Canada Agilent Technologies Canada Inc 5150 Spectrum Way Mississauga Ontario L4W 5G1 tel 1 877 894 4414 Europe Agilent Technologies Test amp Measurement European Marketing Organisation P O Box 999 1180 AZ Amstelveen The Netherlands tel 31 20 547 9999 Japan Agilent Technologies Japan Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan tel 81 426 56 7832 fax 81 426 56 7840 Technical data is subject to change Latin America Agilent Technologies Latin American Region Headquarters 5200 Blue Lagoon Drive Suite 950 Miami Florida 33126 U S A tel 305 267 4245 fax 305 267 4286 Australia New Zeala
72. ement sample of 5 points separated by 30 4 microsecond time intervals The easiest way to increase the data acquisition time is to increase the number of power line cycles in the measurement By doing this the unit automatically sets the sweep time interval sweep offset and sweep points based on sampling the maximum number of points to provide the best noise filtering To change the power line cycles on which a measurement is based use SENS SWE NPLC lt n gt If your load does not draw currents with a significant noise component use a setting of 0 00912 PLC for fast measurements Use a setting of 1 PLC to achieve full accuracy on the 0 5mA current range Measurement Samples and Time Interval You can vary both the number of data points in a measurement sample as well as the time between samples This is illustrated in figure 5 2 lt SENSISMETINT dime SS MEPAN lt of ncints gt Figure 5 2 Commands that Control Measurement Time When the instrument is turned on and at RST the output voltage or current sampling rate is 30 4 microseconds and the sweep size is set to 5 data points This means that it takes about 152 microseconds per measurement You can vary this data sampling rate with SENS SWE TINT lt sample period gt SENS SWE POIN lt points gt For example to set the time interval to 60 8 microseconds per measurement with 1500 samples use SENS SWE TINT 60 8E 6 POIN 1500 Note that increasing the number of
73. ency 2kHz Current slew rate 0 167A uUs Transient duty cycle 50 Turn the transient generator on Adjust the oscilloscope for a waveform similar to that in Figure B 2 The output voltage should return to within 40mV in less than 60us 45us or 35us following a 0 25A to 0 5A load change Check both loading and unloading transients by triggering on the positive and negative slope Record the voltage at time t in the performance test record card under Voltage Priority Transient Response Voltage Repeat steps 2 through 4 for the 20kHz and the 30kHz bandwidths Periodic and random deviations PARD in the output combine to produce a residual ac current as well as an ac voltage superimposed on the dc output PARD is specified as the rms output current in a frequency range specified in Appendix A Program Commands OUTP ON 1 SOUR FUNC MODE CURR 1 CURR 0 0005 1 STAT OPER COND 1 Transient Response Tests Voltage Priority Transient Recovery Time This test measures the time for the output voltage to recover to within the specified value following a 50 change in the load current using an RC network of a 10uF capacitor and 0 2 ohm resistor across the output The test must be performed in all three bandwidths 10kHz 20kHz and 30kHz Program Commands OUTP OFF 1 OUTP ON 1 SOUR FUNC MODE VOLT 1 VOLT 10 1 CURR LIM 0 5 1 VOLT ALC BWI
74. ense terminals RST resets the de source to its default settings with the output off Turn on the de source and program the current limit to 0 5125A Measure the output voltage and current Set the DVM to the 10V range and record the output voltage reading The DVM reading and measurement query result should be within the limits specified in the performance test record card under Voltage Priority Programming Accuracy 0V and Readback Accuracy OV The current measurement query result should be approximately zero Program the output voltage to full scale positive output Measure the output voltage Record the output voltage reading on the DVM The DVM reading should be within the limits specified in the test record card under Voltage Priority Programming Accuracy 10V The difference between the DVM reading and the measurement query result should be within the limits specified under Readback Accuracy 10V Program the output voltage to full scale negative output Measure the output voltage Record the output voltage reading on the DVM The DVM reading should be within the limits specified in the test record card under Voltage Priority Programming Accuracy 10V The difference between the DVM reading and the measurement query result should be within the limits specified under Readback Accuracy 10V Positive Current Limit CL 86 Action Reset the de source and connect an ammeter directly across the HI and LO termina
75. ent The maximum output current that can be programmed in current priority mode is 0 5125 mA The command to program the current is CURR lt n gt lt channel list gt To query the programmed output current setting for output 1 use CURR lt channel list gt Output Mode You can program the unit to operate in either voltage priority or current priority mode In voltage priority mode the output is controlled by a constant voltage feedback loop which maintains the output voltage at its programmed setting In current priority mode the output is controlled by the constant current feedback loop which maintains the output load or source current at its programmed setting Use the following command to configure the output mode FUNC MODE lt mode gt lt channel list gt where lt mode gt is the operating mode VOLT CURR NOTE If the output is on changing the output mode will cause the output to turn OFF cycle modes and then turn ON Also there is no interaction or coupling between modes Switching back and forth between modes does not change the programmed values 40 Programming the DC Source 5 Oscillation Protection Oscillation protection is a built in function that shuts down the output in about 10 milliseconds if a persistent and severe oscillation condition is detected Oscillation protection can be enabled or disabled using the following command OUTP OSCP lt bool gt lt channel list gt where lt
76. ent register to be set Ifthe same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Questionable Condition register sets the corresponding bit in the Questionable Event register Ifthe same bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Questionable Condition register can set the corresponding bit in the Questionable Event register Command Syntax STATus QUEStionable NTRansition lt NRf gt lt channel list gt STATus QUEStionable PTRansition lt NRf gt lt channel list gt Parameters 0 to 32767 Preset Value NTR register 0 PTR register 32767 Examples STAT QUES NTR 16 1 STAT QUES PTR 512 1 Query Syntax STAT QUES NTR lt channel list gt STAT QUES PTR lt channel list gt Returned Parameters lt NR1 gt Register value Related Commands STAT QUES ENAB 71 6 Language Dictionary System Commands System commands control system functions that are not directly related to output control or measurement functions SYSTem ERRor This query returns the next error number followed by its corresponding error message string from the remote programming error queue The queue is a FIFO first in first out buffer that stores errors as they occur As it is read each error is removed from the queue When all errors have been read the query returns 0 NO ERROR If more errors are accumulated than the queue can hold the last error in the queue
77. etters command or three letters and a query They are defined by the IEEE 488 2 standard to perform common interface functions Table 6 2 lists all of the common commands in alphabetical order Programming Parameters Table 6 3 lists all of the output programming parameters 53 6 Language Dictionary SCPI Programming Commands At a Glance Table 6 1 Subsystem Commands Syntax ABORt CALibrate gt CURRent LEVEL channel LIMit POSitive channel NEGative channel gt MEASure lt max_val gt channel DATA lt n gt DATE lt date gt LEVel lt level gt PASSword lt n gt SAVE STATE lt bool gt lt n gt VOLTage channel INITiate IMMediate NAME lt name gt FETCh ARRay CURRent DC list VOLTage DC list SCALar CURRent DC list VOLTage DC list MEASure ARRay CURRent DC max_val list VOLTage DC list SCALar CURRent DC max_val list VOLTage DC list OUTPut STATe lt bool gt list OSCProtect STATe lt bool gt list PROTection CLEar list SENSe CURRent DC RANGe UPPer lt max_val gt list FUNCtion lt function gt list SWEep NPLCycles lt n gt OFFSet POINts lt n gt POINts lt n gt TINTerval lt n gt WINDow TYPE lt type gt 54 Resets the trigger system to the Idle state Calibrate output current and low current measurement rang
78. exceeded capability of the range Standard Event Status Group Operation complete Query error Device dependent error Execution error Command error Power on Status Byte and Service Request Enable Registers The unit is waiting for a trigger Questionable status summary bit Message Available summary bit Event Status Summary bit Master Status Summary bit Request Service bit Operation status summary bit Operation Status Group The Operation Status registers record signals that occur during normal operation As shown below the group consists of a Condition PTR NTR Event and Enable register The outputs of the Operation Status register group are logically ORed into the OPERation summary bit 7 of the Status Byte register Condition STAT OPER COND lt channel list gt A register that holds real time status of the circuits being monitored It is a read only register PTR Filter STAT OPER PTR lt n gt lt channel list gt A positive transition filter that functions as described under STAT OPER NTR PTR commands in chapter 6 It is a read write register It is a read write register Event STAT OPER EVEN lt channel list gt A register that latches any condition that is passed through the PTR or NTR filters It is a read only register that is cleared when read Enable STAT OPER ENAB lt n gt lt channel list gt A register that functions as a mask for enabling specific bits from the Event register
79. f the dc source are listed in the Specifications table in Appendix A The dc source operates from an GPIB address that is set from the rear panel To set the GPIB address set the Address switches on the rear panel see chapter 2 The address can be set from 0 to 30 31 4 Introduction to Programming Introduction to SCPI SCPI Standard Commands for Programmable Instruments is a programming language for controlling instrument functions over the GPIB SCPI is layered on top of the hardware portion of IEEE 488 2 The same SCPI commands and parameters control the same functions in different classes of instruments Conventions Used in This Guide Angle brackets lt gt Vertical bar Square Brackets Braces Parentheses _ Computer font Items within angle brackets are parameter abbreviations For example lt NR1I gt indicates a specific form of numerical data Vertical bars separate alternative parameters For example VOLT CURR indicates that either VOLT or CURR can be used as a parameter Items within square brackets are optional The representation SOURce VOLTage means that SOURce may be omitted Braces indicate parameters that may be repeated zero or more times It is used especially for showing arrays The notation lt A gt lt B gt shows that parameter A must be entered while parameter B may be omitted or may be entered one or more times Items within parentheses are used in place of th
80. face Caution refer to accompanying documents The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Declaration Page gts 7 Agilent Technologies 2 3 _ Innovating the HP Way DECLARATION OF CONFORMITY According to ISO IEC Guide 22 and CEN CENELEC EN 45014 MAN Responsible Party Alternate Manufacturing Site Manufacturer s Name Agilent Technologies Inc Agilent Technologies Manufacturer s Address Power Products PGU South Queensferry 140 Green Pond Road West Lothian EH30 9TG Rockaway New Jersey 07866 United Kingdom U S A declares that the product Product Name Component Test dc Source Model Number N3280A Product Options This declaration covers all options of the above product s Conforms with the following European Directives The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries
81. ge LEVel TRIGgered AMPLitude lt channel list gt Returned Parameters lt NR3 gt Related Commands INIT VOLT MODE 67 6 Language Dictionary SOURce VOLTage MODE This command determines what happens to the output voltage during a triggered event FIXed STEP Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands The output voltage is unaffected when a trigger occurs The output voltage is programmed to the value set by VOLT TRIG when a trigger occurs SOURce VOLTage MODE lt mode gt lt channel list gt FIXed STEP FIXed VOLT MODE FIX 1 SOURce VOLTage MODE lt channel list gt lt CRD gt VOLT TRIG SOURce VOLTage PROTection STATe This command enables or disables the overvoltage protection OVP function The command only applies in voltage priority mode When enabled the output of the unit will shut down and the output relays will open when the output voltage exceeds 11 5V 0 3V or 11 5V 40 3V CAUTION Disabling the overvoltage protection function may cause excessive output voltages such as can occur if remote sense leads are shorted to damage the equipment under test Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters 68 SOURce VOLTage PROTection STATe lt bool gt lt channel list gt 0 OFF 1 ON ON VOLT PROT STAT 0 1 SOURce VOLTage PROTection STATe lt channel
82. ger source 46 Programming the DC Source 5 To select GPIB bus triggers use TRIG ACQ SOUR BUS To select external triggers use TRIG ACQ SOUR EXT Selecting the Sensing Function Each output channel has its own measurement buffer Since both voltage and current measurements are supported you must specify a measurement function before you generate a measurement trigger Use the following command to specify a measurement function SENS FUNC CURR lt channel list gt or SENS FUNC VOLT lt channel list gt Using this command makes it possible to measure output voltage on some channels while measuring output current on other channels Output Settling Delay If an output change has been programmed to occur in conjunction with a measurement trigger the dc source will delay the start of a measurement until the output has settled This is an automatic function that allows the output to settle to approximately 0 1 of final value for a representative load that is a function of the selected sourcing mode The representative load in voltage priority mode is a 20 ohm resistor with the current limit set to MAXimum The representative load in current priority mode is a zero ohm short circuit To change the source settling delay you must first change the source delay mode to MANual then set a value for the delay time Use the following commands SOUR DEL MODE MAN lt channel list gt SOUR DEL lt time gt lt channel l
83. haracter data too long Character data not allowed String data error Invalid string data e g END received before close quote String data not allowed Block data error Invalid block data e g END received before length satisfied Block data not allowed Expression error Invalid expression Expression data not allowed Execution Errors 200 through 299 sets Standard Event Status Register bit 4 Execution error generic Data out of range e g too large for this device Too much data out of memory block string or expression too long Illegal parameter value device specific Out of memory Macro error Macro execution error Illegal macro label Macro recursion error Macro redefinition not allowed System Errors 300 through 399 sets Standard Event Status Register bit 3 System error generic Too many errors errors beyond 9 lost due to queue overflow Query Errors 400 through 499 sets Standard Event Status Register bit 2 Query error generic Query INTERRUPTED query followed by DAB or GET before response complete Query UNTERMINATED addressed to talk incomplete programming message received Query DEADLOCKED too many queries in command string Query UNTERMINATED after indefinite response Error Messages C Table C 1 Error Numbers continued Selftest Errors 0 through 99 sets Standard Event Status Register bit 3 No error Output non volatile RAM CAL section checksum failed Output 2 non v
84. he following table lists the errors that are associated with SCPI syntax errors and interface problems It also lists the device dependent errors Information inside the brackets is not part of the standard error message but is included for clarification When errors occur the Standard Event Status register records them in bit 2 3 4 or 5 as described in the following table Table C 1 Error Numbers Error String Description Explanation Examples Command Errors 100 through 199 sets Standard Event Status Register bit 5 Command error generic Invalid character Syntax error unrecognized command or data type Invalid separator Data type error e g numeric or string expected got block data GET not allowed Parameter not allowed too many parameters Missing parameter too few parameters Program mnemonic too long maximum 12 characters Undefined header operation not allowed for this device Check the language setting Header suffix out of range value of numeric suffix is invalid Invalid character in number includes 9 in octal data etc Numeric overflow exponent too large exponent magnitude gt 32 k Too many digits number too long more than 255 digits received Numeric data not allowed 103 C Error Messages 104 Table C 1 Error Numbers continued Invalid suffix unrecognized units or units not appropriate Suffix not allowed Invalid character data bad character or unrecognized C
85. he front of this guide Packaging Material Until you have checked out the de source save the shipping carton and packing materials in case the unit has to be returned If you return the dc source for service attach a tag identifying the owner s name and address the model number and a brief description of the problem Additional Items Table 2 1 Items Supplied Part Number Power Cord contact the nearest Agilent A power cord appropriate for your location Sales and Support Office 4 Output 1253 4893 A 6 terminal connector plug for connecting the output connectors sense ground and guard The connector installs in the back of the unit Trigger 1252 8670 3 terminal digital plug for connecting the trigger input connector signal The connector installs in the back of the unit Line Fuse 2110 0638 3 15 AT time delay for 100 120 Vac operation 2110 0773 1 6 AT time delay for 220 230 Vac operation User s Guide 5964 8248 Cleaning Use a dry cloth or one slightly dampened with water to clean the external case Do NOT open the unit WARNING To prevent electric shock unplug the unit before cleaning 19 2 Installation Location Figure 2 1 gives the dimensions of your dc source The de source must be installed in a location that allows enough space at the sides and back of the unit for adequate air circulation see Bench Operation NOTE This dc source generates magnetic fields that may affect the operation of
86. he line voltage that you have selected see Table 2 1 If the rating is incorrect replace the fuse with the correct one 107 Earlier Version Output Connectors This appendix documents the earlier version output connectors used on Agilent N3280A units Earlier style Agilent N3280A units used a different style output connector with ten 10 pins instead of the six used on the present connector The additional pins were used as guard connection points The earlier style connector also limited the wire sizes that could be used for output connections Wires sizes were limited to AWG 24 and AWG 26 The following table documents the mating part for the earlier style connectors These mating parts were not shipped with the unit Mating Connector Part Numbers CHG 2010 J01010 KEP Output 10 terminal output plug for connecting load and sense connectors wires Connector installs in the back of the unit Can be for wires ordered from 3M company www 3m com interconnects 9821 017 36 AZN Output 10 terminal output plug with terminated 36 coaxial underline specifies coax length connectors cables Connector installs in the back of the unit Can be with coax ordered from 3M company www 3m com interconnects Rear Panel Pinout Assignments The following figure documents the pin out assignments of the earlier style connectors a 246610 13579 OUTPUT PI 1 CHASSIS
87. her by design or type testing Table A 2 Supplemental Characteristics Parameter Output Programming Limits Voltage Current Limit Current Limit Current Programming Resolution Voltage Current Limit Current Limit Current Programming Accuracy Temperature Coefficients Voltage Current Limit Current Limit Current Bandwidth Voltage 10kHz 20kHz 30kHz Current Limit 10kHz 30kHz Typical Output Readback Ranges Voltage 0 5A Curr Range 15mA Curr Range 0 5mA Curr Range Voltage 0 5A Curr Range 15mA Curr Range 0 5mA Curr Range Voltage 0 5A Curr Range 15mA Curr Range 0 5mA Curr Range Voltage 0 5A Curr Range 15mA Curr Range 0 5mA Curr Range Readback Resolution Readback Accuracy Temperature Coefficient DC Readback speed with no change on the output 10 25V to 10 25V 75uA to 0 5125A tracks Current Limit N A 16 bits 312UV 16 bits 8uA 16 bits 8uA N A 90 ppm 80LV 110 ppm 5uA 110 ppm 5uA N A 13 25V to 13 25V 0 5125mA to 0 5125mA 0 5125mA to 0 5125mA 0 5125mA to 0 5125mA 16 bits 312UV 16 bits 16nA 16 bits 16nA 16 bits 16nA 70 ppm 100LV 30 ppm 2nA 30 ppm 2nA 30 ppm 2nA 13 25V to 13 25V 0 6A to 0 6A 15 375mA to 15 375mA 0 5125mA to 0 5125mA 16 bits 312uV 16 bits 184A 16 bits 460nA 16 bits 16nA 70 ppm 100uV 60 ppm 5uA 40 ppm 40nA 30 ppm 2nA
88. here are two types of SCPI messages program and response A program message consists of one or more properly formatted SCPI commands sent from the controller to the dc source The message which may be sent at any time requests the dc source to perform some action A response message consists of data in a specific SCPI format sent from the dc source to the controller The dc source sends the message only when commanded by a program message query Figure 4 2 illustrates the SCPI message structure Channel Data Message Unit Query Indicator a T VOLT LEV 10 1 PROTON 1 CURR 1 lt NL gt f i Keyword Separator Message Terminator Message Unit Separators Root Specifier Figure 4 2 Command Message Structure The Message Unit The simplest SCPI command is a single message unit consisting of a command header or keyword followed by a message terminator The message unit may include a parameter after the header The parameter can be numeric or a string ABORt lt NL gt VOLTage 20 lt NL gt Channel List Parameter The channel parameter is required to address one or more channels It has the following syntax lt channel gt lt channel gt lt channel gt lt channel gt You can also specify a range of sequential channels using the following syntax lt start_channel gt lt end_channel gt For example 2 specifies channel 2 and 1 3 specifies channels 1 through 3 The Agilent N3280
89. ightly If you adjusted the current limit close the switch and go back to step 3 6 Record the output current reading on the ammeter full load current value The difference between the two current readings is the Load effect current and should be within the limits listed in the performance test record card under Voltage Priority Source Effect Current 90 Performance and Calibration Procedures Current Priority Constant Current Test This test measures the change in output current resulting from a change in output voltage from about zero volts to the maximum output voltage NOTE The voltage limits in Current Priority Mode are not programmable Action Program Commands 1 Turn off the de source and connect the output as shown in Figure B le RST with an ammeter in series with a 16k ohm load resistor across the Hi and Lo output terminals Also connect a shorting switch across the resistor 2 Start with a short across the output switch closed Turn on the dc OUTP ON 1 source and program the Current Priority mode Program the current to SOUR FUNC MODE CURR 1 the maximum value 0 5mA CURR 0 0005 1 3 Set the ammeter to the 1A range and record the output current reading on the ammeter shorted output value 5 Remove the short from the output open the switch 6 Read back the N3280A status to be sure that it s in the CC mode This STAT OPER COND 1 query should return a Bit valu
90. inator A terminator informs SCPI that it has reached the end of a message Three permitted messages terminators are e newline lt NL gt which is ASCII decimal 10 or hex 0A end or identify lt END gt both of the above lt NL gt lt END gt In the examples of this guide there is an assumed message terminator at the end of each message SCPI Data Formats All data programmed to or returned from the dc source is ASCII The data may be numerical or character string Numerical Data Formats Response Formats Digits with an implied decimal point assumed at the right of the least significant digit Examples 273 Digits with an explicit decimal point Example 0273 Digits with an explicit decimal point and an exponent Example 2 73E 2 Parameter Formats Extended format that includes lt NR1 gt lt NR2 gt and lt NR3 gt Examples 273 273 2 73E2 Expanded decimal format that includes lt NRf gt and MIN MAX Examples 273 273 2 73E2 MAX MIN and MAX are the minimum and maximum limit values that are implicit in the range specification for the parameter Boolean Data Example 0 1 or ON OFF 35 4 Introduction to Programming Suffixes and Multipliers Class Suffix Unit Unit with Multiplier Current A ampere MA milliampere Amplitude V volt MV millivolt Time S second MS millisecond Common Multipliers 1E3 K kilo 1E 3 M milli 1E 6 U micro Response Data Types Character strings returned
91. ines which bits from the Status Byte Register see STB for its bit configuration are allowed to set the Master Status Summary MSS bit and the Request for Service RQS summary bit A 1 in any Service Request Enable Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are logically ORed to cause Bit 6 of the Status Byte Register to be set When the controller conducts a serial poll in response to SRQ the RQS bit is cleared but the MSS bit is not When SRE is cleared by programming it with 0 the dc source cannot generate an SRQ to the controller The query returns the current state of SRE Command Syntax SRE lt NRf gt Parameters 0 to 255 Power on Value 0 Example SRE 20 Query Syntax SRE Returned Parameters lt NR1 gt register binary value Related Commands ESE ESR STB This query reads the Status Byte register which contains the status summary bits and the Output Queue MAV bit Reading the Status Byte register does not clear it The input summary bits are cleared when the appropriate event registers are read The MAV bit is cleared at power on by CLS or when there is no more response data available A serial poll also returns the value of the Status Byte register except that bit 6 returns Request for Service RQS instead of Master Status Summary MSS A serial poll clears RQS but not MSS When MSS is set it indicates that the de source has one or more reasons for req
92. ing power the output voltage will continue to increase in the positive or negative direction as more current is forced into the unit Note that a VL positive voltage limit or VL negative voltage limit status bit will be set to register a voltage limit at about 0 8 V before the positive or negative voltage line is reached The maximum current available in current priority mode is about 0 5 mA which is ideal for testing sensitive devices such as input diodes In this mode the output current must be programmed to the desired positive or negative value However the positive and negative voltage limits are not programmable and vary with the actual output current as shown in the figure The typical positive voltage limit ranges from about 10 75V at no load to about 9 5V at full load The typical negative voltage limit ranges from about 10 75V to about 9 5V NOTE Overvoltage protection is not functional in current priority mode Measurement Characteristics The N3280A uses a digitizing measurement system with a single timebase for all output channels The number of measurement samples and the sampling interval of the timebase can be explicitly programmed These values will apply to measurements taken on all outputs For example if simultaneous measurements are made on four output channels and one of the three channels is set to one power line cycle PLC then all three channels will be set to one power line cycle per measurement Conve
93. ist gt where lt time gt is specified in seconds The minimum time interval that can be programmed is specified by SENS SWE TINT In addition to the minimum time interval the delay time required for a given measurement accuracy is also function of load measurement parameter and required accuracy It may be convenient to characterize the delay required for a particular load so that the test throughput can be optimized Use the MEAS ARRAY query to obtain a record of the voltage or current as a function of time after a source change so that the best speed accuracy tradeoff can be made Generating Measurement Triggers After you specify the appropriate trigger source sensing function and optional settling delay generate triggers as follows GPIB Triggers Send one of the following commands over the GPIB TRIG IMM not affected by the trigger source setting TRG an IEEE 488 Group Execute Trigger bus command EXTernal Triggers Provide a negative going TTL signal to the trigger input 47 5 Programming the DC Source When the acquisition finishes any of the FETCh queries can be used to return the results Once the measurement trigger is initiated if a FETCh query is sent before the data acquisition is triggered or before it is finished the response data will be delayed until the trigger occurs and the acquisition completes This may tie up the computer if the trigger condition does not occur immediately One way to wait for results
94. led before the dc source will accept any other calibration commands The first parameter specifies the enabled or disabled state The second parameter is the password A password is required if calibration mode is being enabled and the existing password is not 0 If the password is not entered or is incorrect an error is generated and the calibration mode remains disabled The query returns only the state not the password NOTE Whenever the calibration state is changed from enabled to disabled any new calibration constants are lost unless they have been stored with CALibrate SAVE Command Syntax CALibrate STATe lt bool gt lt NRf gt Parameters 0 OFF 1 ON lt password gt RST Value OFF Examples CAL STAT 1 3280 CAL STAT OFF Query Syntax CALibrate STATe Returned Parameters lt NRI gt Related Commands CAL PASS CAL SAVE RST CALibrate VOLTage This command initiates the calibration of the output voltage and the voltage measurement circuit Command Syntax CALibrate VOLTage lt channel gt Parameters None Examples CAL VOLT 1 59 6 Language Dictionary Measurement Commands Measurement commands consist of fetch measure and sense commands Measure commands measure the output voltage or current Measurements are performed by digitizing the instantaneous output voltage or current for a specified number of samples storing the results in a buffer and calculating the measured result Two types of measurement
95. list gt lt NR1 gt 0 or 1 Language Dictionary 6 Status Commands Status commands program the dc source status registers The dc source has three groups of status registers Operation Questionable and Standard Event The Standard Event group is programmed with Common commands as described later in this section The Operation and Questionable status groups each consist of the Condition Enable and Event registers and the NTR and PTR filters Chapter 5 explains how to read specific register bits and use the information they return STATus OPERation EVENt This query returns the value of the Operation Event register The Event register is a read only register which stores latches all events that are passed by the Operation NTR and or PTR filter Reading the Operation Event register clears it Query Syntax STATus OPERtion EVENt lt channel list gt Parameters None Returned Parameters lt NR1 gt register value Examples STAT OPER 1 Related Commands CLS STAT OPER NTR STAT OPER PTR Table 6 4 Bit Configuration of Operation Status Registers Bit Position 6 5 4 3 2 1 0 BitName OFF V ve CL Biya A 80a 1G E Se OFF The selected output is off CL The selected output is in negative current limit VL The selected output is in negative voltage limit CL The selected output is in positive current limit VL The selected output is in positive voltage limit CV The selected output is in con
96. ll also need a digital multimeter for making voltage and current measurements If you have not already done so connect your unit to the computer s GPIB interface Also connect the power cord to the unit and plug it in 10 11 12 13 14 15 16 28 Procedure Connect the Hi sense terminal to the Hi terminal Connect the Lo sense terminal to the Lo terminal Connect the voltage inputs of the voltmeter across the Hi and Lo sense terminals of output 1 Turn the unit on The unit undergoes a self test when you first turn it on Check that the fan is on Program Output On 1 Program Voltage 10 1 Create a variable for a measurement Program Measure Voltage 1 Read the variable value Program Voltage 10 1 Program Measure Voltage 1 Read the variable value Program Output Off 1 Connect the current measurement inputs of the ammeter across Hi and Lo output terminals of output 1 Observe polarity Program Output On 1 Program Function Mode CURR 1 Program Current 0 0005 1 Create a variable for a measurement Program Measure Current 1 Read the variable value Program Output Off 1 Disconnect the multimeter Repeat steps 3 through 15 for outputs 2 3 and 4 Explanation The external voltmeter is used to verify the output During selftest all indicators light simultaneously and then light individually in a clockwise manner to test the f
97. llowing commands over the GPIB TRIG IMM not affected by the trigger source setting TRG an IEEE 488 Group Execute Trigger bus command EXTernal Triggers Provide a negative going TTL signal to the trigger input When the trigger system enters the Output Change state upon receipt of a trigger see figure 5 1 the triggered functions are set to their programmed trigger levels When the triggered actions are completed the trigger system returns to the Idle state Making Measurements All measurements are performed by digitizing the instantaneous output voltage or current for a defined number of samples and sample interval storing the results in a buffer and then calculating the average NOTE There is one measurement buffer for each output channel in the de source However only the following measurement parameters can be configured independently for each channel SENSe FUNCtion SENSe CURRent RANGe There are two ways to make measurements Use the MEASure queries to immediately start acquiring new voltage or current data and return measurements from this data as soon as the buffer is full This is the easiest way to make measurements since it requires no explicit trigger programming Use a triggered measurement when you need to synchronize the data acquisition with a transition in the output voltage or current Then use the FETCh queries to return the measurement data FETCh queries do not trigger the acquisition of new measurement
98. ls as shown in Figure B la RST resets the de source to its default settings with the output off Turn on the de source and program the output voltage to 10 volts The default output current limit is set to 1mA Set the ammeter to the 1mA range and record the output current reading on the ammeter The ammeter reading should be within the limits specified in the performance test record card under Voltage Priority Programming Accuracy ImA Current limit Program the output current limit to 0 5A Measure the output current Program Commands Nk RST n OUTP ON 1 CURR LIM 0 5125 1 MEAS VOLT 1 MEAS CURR 1 VOLT 10 1 MEAS VOLT 1 VOLT 10 1 MEAS VOLT 1 Program Commands u RST OUTP ON 1 VOLT 10 1 CURR LIM 0 5 1 MEAS CURR 1 10 11 Performance and Calibration Procedures Set the ammeter to the 1A range and record the output current reading on the ammeter The ammeter reading should be within the limits specified in the test record card under Voltage Priority Programming Accuracy 0 5A Current limit The difference between the ammeter reading and the measurement query result should be within the limits specified under Readback Accuracy 0 5A current Turn off the output and connect a 1k ohm resistor in series with the ammeter across the output as shown in Figure B 1c You do not need
99. lue programs both the positive and negative current limit Figure 1 1 shows the voltage priority operating characteristics of the dc source The area in quadrants 1 and 3 shows the characteristics of the output when it is being operated as a source sourcing power The area in quadrants 2 and 4 shows the characteristics of the output when it is being operated as a load sinking power Output Key Voltage Sinking power A Sourcing power lt Programmable 10 25V y setting Output a Current limit 10 25V 512 5mA 512 5mA v Figure 1 1 Output Characteristic Voltage Priority The heavy line illustrates the locus of possible operating points as a function of the output load which may be purely resistive or possibly include external voltage or current sources In voltage priority mode the constant voltage loop will regulate the output voltage as the load changes unless the output current attempts to exceed the current limit setting If this occurs either the negative or the positive current limit loop will regulate the output current at the programmed value Either a CV constant voltage CL positive current limit or CL negative current limit status flag is set to indicate which loop is presently controlling the output 15 1 General Information If the output voltage exceeds either the positive or negative overvoltage set point the output will shu
100. ment Required continued Oscilloscope Sensitivity 1 mV div Agilent Infinium or Bandwidth Limit 20 to 30 MHz equivalent Probe 1 1 with RF tip RMS voltmeter True RMS Rhode amp Schwartz Bandwidth 20 Mhz min Model URE3 RMS P P Sensitivity 100 UV Voltmeter Variable voltage transformer Adjustable to highest rated input voltage Agilent 6800 series or ac source range Power 500 VA Tektronixs current probe 20mA div AMS503B amplifier and power module TM501 or 2A Pulse function generator 1V Square Wave 400 1kHz Agilent 8116A Load resistor 20 ohms 20 ohm 10W 0811 3896 or equivalent Resistor 0 2 ohm 5 1 ohm resistors in parallel 5 0699 0208 or equivalent Resistor 1k ohm 1k ohm for 15mA range accuracy 0757 0280 or equivalent Resistor 20K ohm 20k ohm for 0 5mA range accuracy 0757 0449 or equivalent Resistor 16k ohm 16 2k ohm for rms noise measurements 0757 0447 or equivalent Resistor 50 ohm 50 ohm series resistor for noise 0757 0706 or equivalent measurements Capacitor 10uF for voltage 3 3 3uF film type capacitors in parallel 3 0160 7308 or equivalent transient response Capacitor for current 0 47uF film type capacitor 1060 0970 or equivalent transient response Performance amp Verification Tests Enter all of the performance test results and calculated measurements in the Performance Test Record Form that is provided at the end of this section Measurement Techniques If more than one meter or if a me
101. meter to read the average of the measurements as follows Press Shift key fl Shift key N Press down arrow until RMATH function is selected then press gt Press up arrow until MEAN function is selected then press ENTER Execute the program by pressing f0 ENTER TRIG ENTER Wait for 100 readings and then read the average measurement by pressing f1 ENTER To repeat the measurement perform steps e and f Voltage Priority Constant Voltage Load Effect This test measures the change in output voltage resulting from a change in output current from about zero amps to about 0 5 amps Action Program Commands Turn off the dc source and connect the output as shown in Figure B lb RST with the DMM across the HI and LO sense terminals Connect the 20 ohm load resistor and switch across the HI and LO output terminals Start with the load disconnected switch open Turn on the de source OUTP ON 1 program the output voltage to the full scale value 10 0V and the VOLEO 1 X current limit to the maximum value 0 5125A CURR LIM 0 5125 1 Set the DVM to the 10V range and record the output voltage reading zero load value Connect the 20 ohm load resistor across the output close the switch Keep the DVM connected Read back the N3280A status to be sure that it s in the CV mode This STAT OPER COND 1 query should return a Bit value of 1 for CV mode If it is not in CV mode use
102. meters None Examples STAT PRES STATUS PRESET STATus QUEStionable EVENt This query returns the value of the Questionable Event register The Event register is a read only register that stores latches all events that are passed by the Questionable NTR and or PTR filter Reading the Questionable Event register clears it Query Syntax STATus QUEStionable EVENt lt channel list gt Parameters None Examples STAT QUES 1 Returned Parameters lt NR 1 gt register value Related Commands CLS STAT QUES ENAB STAT QUES NTR STAT QUES PTR Sao 6 5 Bit Configuration of Questionable Status Registers Bit Position _ alete e e aa IN a a Bit Name not Meas not OSC not UNR not not n E E BitVame 6384 sos ioa Meas Ovld The output measurement exceeded the OT The Li protection EEEN 2 capability of the range PCLR No communication with the selected output OSC The oscillation protection has tripped OV The negative overvoltage protection has tripped UNR The output is unregulated OV The positive overvoltage protection has tripped 70 Language Dictionary 6 STATus QUEStionable CONDition This query returns the value of the Questionable Condition register That is a read only register which holds the real time unlatched questionable status of the dc source Query Syntax STATus QUEStionable CONDition lt channel list gt Parameters None Examples STAT QUES COND 1 Returned Parameters lt NR
103. mething other than the power supply after the power supply has finished all previous sent commands External synchronization is provided by the OPC Query and the OPC command The OPC Query returns the value 1 when all pending operations are completed The GPIB will be held up waiting for the response to the query until this occurs The OPC command will cause bit 0 of the standard event status register to be set when all pending operations are completed The controller can either poll for this status bit or set up an SRQ when this occurs Internal synchronization is required when the test system needs to change a power supply setting or make a power supply internal measurement after the supply has finished all previous sent commands Internal synchronization is provided by the WAI command When the power supply receives the WAI command it holds up processing of any further bus commands until all pending parallel operations are completed For example the WAI command can be used to make a current measurement after an output on command has completed OUTPUT ON 1 WAI MEAS CURR 0 5 1 Using Device Clear You can send a device clear at any time abort a SCPI command that may be hanging up the GPIB interface The status registers the error queue and all configuration states are left unchanged when a device clear message is received Device clear performs the following actions The input and output buffers of the dc source are cle
104. n change the password when the dc source is in calibration mode which requires you to enter the existing password Proceed as follows Action Program Commands 1 Reset the unit RST 2 Enable calibration mode 0 is the default password CAL STAT ON 0 3 Enter the new password You can use any number with up to six CAL PASS lt password gt digits and an optional decimal point If you want the calibration function to operate without requiring any password change the password to 0 zero 4 Save the password CAL SAVE 5 Exit Calibration mode RST also exits calibration mode CAL STAT OFF Calibration Error Messages Errors that can occur during calibration are shown in the following table Table B 3 GPIB Calibration Error Messages Meaning CAL switch prevents calibration call the factory for details CAL password is incorrect CAL not enabled Computed readback cal constants are incorrect Computed programming cal constants are incorrect Incorrect sequence of calibration commands 102 Error Messages Error Number List This appendix gives the error numbers and descriptions that are returned by the dc source Errors are indicated in two ways The Error or Prot indicators are lit on the front panel Error numbers and messages are read back with the SYSTem ERRor query SYSTem ERRor returns the error number into a variable and returns two parameters an NRI and a string T
105. nd Agilent Technologies Australia Pty Ltd 347 Burwood Highway Forest Hill Victoria 3131 tel 1 800 629 485 Australia fax 61 3 9272 0749 tel 0 800 738 378 New Zealand fax 64 4 802 6881 Asia Pacific Agilent Technologies 24 F Cityplaza One 1111 King s Road Taikoo Shing Hong Kong tel 852 3197 7777 fax 852 2506 9284 Manual Updates The following updates have been made to this manual since its publication 6 1 01 Chapter 2 has been updated with information about the new output connector Chapters 5 and 6 have been updated with a new SCPI command SOURce CURRent LIMit BWIDth Appendix A has been updated to include the following information Programming accuracy temperature coefficients Readback accuracy temperature coefficients Output impedance graphs Appendix E has been added to document the earlier output connector
106. ndix A Active guard available for accurate current measurements Solid state output and sense terminal disconnect relays High GPIB throughput ff o Oo o Additional features include Positive and negative overvoltage protection shutdown Over temperature and oscillation protection Programmable current limit in voltage priority mode Remote Programming NOTE With the exception of the power switch there are no front panel controls for the Agilent N3280A dc source The N3280A can be controlled only with SCPI programming commands The dc source may be remotely programmed via the GPIB bus GPIB programming is with SCPI commands Standard Commands for Programmable Instruments which make dc source programs compatible with those of other GPIB instruments Dc source status registers allow remote monitoring of a wide variety of operating conditions Refer to chapters 5 and 6 for more information 14 General Information 1 Output Characteristics Voltage Priority Operation Each Agilent N3280A output is a four quadrant bipolar dc source that can be operated in either voltage or current priority mode In voltage priority mode the output is controlled by a bi polar constant voltage feedback loop which maintains the output voltage at its positive or negative programmed setting The output voltage will remain at its programmed setting as long as the load current remains within the positive or negative current limit A single positive va
107. ngth to the load to about 5 meters 15 ft or less The load wires must also be of a diameter large enough to avoid excessive voltage drops due to the impedance of the wires In general if the wires are heavy enough to carry the maximum short circuit current without overheating excessive voltage drops will not be a problem 23 2 Installation NOTE Any voltage drop in the load leads must be subtracted from the full scale voltage available at the output terminals Coaxial Guard Connections An active guard connection is available at the output connector When the guard connection is extended to a test fixture for example it can be used to eliminate the effects of leakage current that can exist between the Hi and Lo output terminals when testing high impedance devices In particular the Hi output terminal and the Hi sense terminal may benefit from guarding In this way any leakage current that is not load current will be collected by the circuit and not be included in the output current measurement The guard connection is always enabled and provides a buffered voltage that is at approximately the same potential as the Hi output terminal The output impedance of the guard is approximately 2 1K ohms If you are using tri axial cables to extend the guard connection to the test fixture use the center connector for the Hi connection the inner shield for the guard connection and the outer shield as the Lo connection see figure 2 5 OUT
108. nic Load Programming Test Setup Voltage Priority Tests Voltage Programming and Readback Accuracy Positive Current Limit CL Negative Current Limit CL Current Priority Tests Current Programming and Readback Accuracy Load Effect Tests Voltage Priority Constant Voltage Load Effect Voltage Priority Current Limit Load Effect Voltage Priority Current Limit Load Effect Test Current Priority Constant Current Test Source Effect Tests Voltage Priority Constant Voltage Source Effect Voltage Priority Current Limit Source Effect Voltage Priority Current Limit Source Effect 10 Current Priority Constant Current Source Effect Ripple and Noise Tests Voltage Priority Ripple and Noise Current Priority Ripple and Noise Transient Response Tests Voltage Priority Transient Recovery Time Current Priority Transient Recovery Time Performance Test Equipment Form Performance Test Record Form Performing the Calibration Procedure Enable Calibration Mode Voltage Priority Mode Programming and Measurement Calibration Negative Current Limit Calibration Positive Current Limit Calibration 0 5A Range Current Measurement Calibration 15mA Range Current Measurement Calibration Current Priority Mode Programming and 0 5mA Range Measurement Calibration Saving the Calibration Constants Changing the Calibration Password Calibration Error Messages ERROR MESSAGES Error Number List LINE VOLTAGE SELECTION EARLIER VERSION OUTPUT CONNECTORS Mating C
109. nnect the current input of the 3458A multimeter directly to output 1 Select current calibration for output 1 Select the first calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Set the 3458A multimeter to the 1mA range measure the output current and enter the data into the de source Select the second calibration point OPC prevents processing of all subsequent commands to ensure that the output is stable Measure the output current and enter the data into the dc source Saving the Calibration Constants source calibration will then remain unchanged Action Save all of the calibration constants Exit Calibration mode RST also exits calibration mode Program Commands CAL CURR MEAS 0 015 1 CAL LEV P1 OPC CAL DATA lt value gt Current Priority Mode Programming and 0 5mA Range Measurement Calibration Program Commands CAL CAL CAL CAL CAL CURR 1 LEV P1 OPC DATA lt value gt LEV P2 OPC DATA lt value gt Program Commands CAL CAL SAVE STAT OFF Storing calibration constants overwrites the existing ones in non volatile memory If you are not sure you want to permanently store the new constants omit this step The dc 101 B Performance and Calibration Procedures Changing the Calibration Password The factory default password is 0 You ca
110. ns Safety warnings for specific procedures are located at appropriate places in the guide 13 1 General Information Options and Accessories Table 1 1 Options Description 87 106 Vac 47 63 Hz 191 233 Vac 47 63 Hz 207 253 Vac 47 63 Hz Add instrument feet for bench mounting p n 5041 9167 Rack mount kit for two side by side N3280A units Consists of Lock link kit p n 5061 9694 Flange kit p n 5063 9212 Tie bracket p n 5002 1587 Rack mount kit for one unit p n 5063 9240 Support rails are required when rack mounting units Use E3663A support rails for Agilent rack cabinets If you are using non Agilent rack cabinets contact the rack manufacturer to obtain support rails for your cabinet Table 1 2 Accessories Item Part Number GPIB cables 1 0 meter 3 3 ft Agilent 10833A 2 0 meters 6 6 ft Agilent 10833B 4 0 meters 13 2 ft Agilent 10833C 0 5 meters 1 6 ft Agilent 10833D Rack mount with slide for two side by side units Order 5063 9255 and 1494 0015 Rack mount with slide for one unit Order 5063 9255 1494 0015 and 5002 3999 Description The Agilent Model N3280A Component Test DC Source is a quad output dc power supply designed to simplify the testing of integrated circuits It has the following key features and performance capabilities High density four isolated outputs in a 2U half rack package Four quadrant bipolar output High programming and measurement accuracy refer to Appe
111. olatile RAM CAL section checksum failed Output 3 non volatile RAM CAL section checksum failed Output 4 non volatile RAM CAL section checksum failed Non volatile RAM CONFIG section checksum failed RAM selftest Device Dependent Errors 100 through 32767 sets Standard Event Status Register bit 3 Flash write error Flash erase error CAL switch prevents calibration CAL password is incorrect CAL not enabled Computed readback cal constants are incorrect Computed programming cal constants are incorrect Incorrect sequence of calibration commands CV or CC status is incorrect for this command Too many sweep points CURRent or VOLTage fetch incompatible with last acquisition Measurement overrange Operation not allowed with the present language setting Valid only while the output is disabled No data in acquisition buffer Bad update data Not in update state Bad binary mode call packet checksum Bad binary mode protocol version Bad binary mode function number Bad binary mode channel list Bad binary mode reply packet checksum Bad binary mode transaction ID 105 Line Voltage Selection To change the line voltage selection 1 Remove the line cord 2 Check if the line voltage displayed in the window must be changed 3 Open the door using a small flat bladed screwdriver 4 Rotate the cylinder so that the correct line voltage appears in the location under the window 5 Pull the fuse drawer out and check if the fuse is correct for t
112. ommands within a single message e Use a semicolon to separate commands within a message There is an implied header path that affects how commands are interpreted by the dc source The header path can be thought of as a string that gets inserted before each command within a message For the first command in a message the header path is a null string For each subsequent command the header path is defined as the characters that make up the headers of the previous command in the message up to and including the last colon separator An example of a message with two commands is OUTPut STATe ON 1 PROTection CLEar 1 which shows the use of the semicolon separating the two commands and also illustrates the header path concept Note that with the second command the leading header OUTPut was omitted because after the OUTPut STATe ON command the header path was became defined as OUTPut and thus the instrument interpreted the second command as OUTPut PROTection CLEar 1 In fact it would have been syntactically incorrect to include the OUTP explicitly in the second command since the result after combining it with the header path would be OUTPut OUTPut PROTection CLEar 1 which is incorrect Moving Among Subsystems In order to combine commands from different subsystems you need to be able to reset the header path to a null string within a message You do this by beginning the command with a colon which discards
113. on This statement is provided to comply with the requirements of the German Sound Emission Directive from 18 January 1991 Sound Pressure Lp lt 70 dB A At Operator Position Normal Operation According to EN 27779 Type Test Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual In some cases the manual change applies only to specific instruments Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Agilent Technologies The information contained in this document is subject to change without notice Copyright 2001 Agilent Technologies Inc Edition 1 March 2001 Update 1 June 2001 Table of Contents Warranty Information Safety Summary Declaration Page Acoustic Noise Information Printing History Table of Contents GENERAL INFORMATION Document Orientation S
114. on a trigger occurs before the pre trigger data count is completed the measurement system ignores this trigger This will prevent the completion of the measurement if another trigger is not generated OFFSET 4096 4096 DATA POINTS OFFSET 2048 4096 DATA POINTS OFFSET 0 4096 DATA POINTS OFFSET 0 to 2 3 4096 DATA POINTS ACQUISITION TRIGGER Figure 5 4 Pre trigger and Post trigger Acquisition 48 Programming the DC Source 5 Programming the Status Registers Status register programming lets you determine the operating condition of the dc source at any time For example you may program the dc source to generate an interrupt SRQ when an event such as a current limit occurs When the interrupt occurs your program can act on the event in the appropriate fashion Figure 5 5 shows the status register structure of the dc source Table 5 1 defines the status bits The Standard Event Status Byte and Service Request Enable registers and the Output Queue perform standard GPIB functions as defined in the ZEEE 488 2 Standard Digital Interface for Programmable Instrumentation The Operation Status and Questionable Status registers implement functions that are specific to the de source QUESTIONABLE STATUS IDENTICAL REGISTERS FOR EACH CHANNEL A Z CONDITION PTR NTR EVENT ENABLE OV OV PCLR OT CHAN 1QSUM LOGICAL UNR OSC Meas Ovid STAND
115. on a selected trigger source causes the specified triggering action to occur If the trigger system is not enabled all triggers are ignored Command Syntax _INITiate IMMediate NAME lt name gt Parameters TRANsient ACQuire Examples INIT NAME TRAN Related Commands ABOR INIT CONT TRIG TRG TRIGger ACQuire This command generates a measurement trigger When the trigger system is initiated the measurement trigger causes the dc source to measure either the output voltage or current and store the results in a buffer The SENS FUNC command determines which signal will be measured Command Syntax TRIGger ACQuire IMMediate Parameters None Examples TRIG TRIG IMM Related Commands ABOR INIT TRG SENS FUNC 73 6 Language Dictionary TRIGger ACQuire SOURce This command selects the trigger source for the measurement trigger system EXT BUS Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters External trigger input signal GPIB device TRG or lt GET gt Group Execute Trigger TRIGger ACQuire SOURce lt source gt BUS EXTernal BUS TRIG ACQ SOUR EXT TRIGger ACQuire SOURce lt CRD gt TRIGger TRANsient SOURce This command selects the trigger source for the output trigger system EXTernal BUS External trigger Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters TRIGger TRANsient input signal GPIB device TRG or lt GET gt
116. onnector Part Numbers Rear Panel Pinout Assignments INDEX 102 103 103 107 109 109 109 111 11 General Information Document Orientation This manual describes the operation of the Agilent Model N3280A Component Test DC Source Unless otherwise noted the unit will be referred to by the description dc source throughout this manual The following Getting Started Map is a general guide to the location of information in this manual Refer to the table of contents or index for a complete list of information Getting Started Map Where to find information General information Chapter 1 Capabilities and characteristics Installing the unit Chapter 2 Line connections Load connections Computer connections Checking out the unit Chapter 3 Verifying proper operation Using the programming interface Chapter 4 GPIB interface Programming the unit using SCPI commands Chapters 5 and 6 SCPI commands SCPI programming examples SCPI language dictionary Verifying and Calibrating the Unit Appendix B Safety Considerations This dc source is a Safety Class 1 instrument which means it has a protective earth terminal That terminal must be connected to earth ground through a power source equipped with a ground receptacle Refer to the Safety Summary page at the beginning of this guide for general safety information Before installation or operation check the dc source and review this guide for safety warnings and instructio
117. other instruments If your instrument is susceptible to operating magnetic fields do not locate it in the immediate vicinity of the dc source Typically at 5 millimeters from the dc source the electromagnetic field is less than 5 gauss Many CRT s such as those used in computer displays are susceptible to magnetic fields much lower than 5 gauss Check susceptibility before mounting any display near the dc source Bench Operation Do not block the fan exhaust at the rear of the unit A fan cools the de source by drawing air in through the sides and exhausting it out the back Minimum clearances for bench operation are 1 inch 25 mm along the sides Rack Mounting The dc source can be mounted in a standard 19 inch rack panel or cabinet Table 1 1 documents the part numbers for the various rack mounting options that are available for the dc source Installation instructions are included with each rack mount option NOTE Support rails or an instrument shelf is required when rack mounting units Oo Chumma 0 eoL 106 Coo a Lue ol LL o a O Figure 2 1 Outline Diagram 20 Installation 2 Power Connections Connect the Power Cord Connect the power cord to the IEC 320 connector on the rear of the unit If the wrong power cord was shipped
118. r to the 1mA range and record the output current reading on the ammeter The reading should be within the limits specified in the performance test record card under Current Priority Programming Accuracy 0 5mA 6 Program the output current to 0 5mA Measure the output current CURR 0 0005 1 7 Set the ammeter to the 1mA range and record the output current reading on the ammeter The reading should be within the limits specified in the performance test record card under Current Priority Programming Accuracy 0 5mA 88 Performance and Calibration Procedures Load Effect Tests The following tests verify the dc regulation of the output voltage and current To insure that the values read are truly dc and not affected by output ripple several dc measurements should be made and the average of these readings calculated An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel Set up the voltmeter and execute the Average Reading program follows a b e f Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER Program 100 samples per trigger by pressing N Rdgs Trig 1 0 0 ENTER Set up voltmeter to take measurements in the statistical mode as follows Press Shift key f0 Shift key N Press up arrow until MATH function is selected then press gt Press up arrow until STAT function is selected then press ENTER Set up volt
119. rameters for these commands are described in chapter 6 Some practical considerations for using these commands are as follows WAL This prevents the dc source from processing subsequent commands until all pending operations are completed OPC This places a 1 in the Output Queue when all pending operations have completed Because it requires your program to read the returned value before executing the next program statement OPC can be used to cause the controller to wait for commands to complete before proceeding with its program 36 Introduction to Programming 4 OPC This sets the OPC status bit when all pending operations have completed Since your program can read this status bit on an interrupt basis OPC allows subsequent commands to be executed NOTE The trigger subsystem must be in the Idle state for the status OPC bit to be true As far as triggers are concerned OPC is false whenever the trigger subsystem is in the Initiated state OUTPUT STATE Example OUTPUT STATE ON starts a sequence of operations in the unit that closes the output and sense relays and sets the output voltage and current at the user s settings It is often important to know when these parallel operations are finished so that the next step in a test sequence can be synchronized with the completion of a power supply command Two types of synchronization are provided External synchronization is required when the test system needs to control so
120. rent limit to 0 5A Measure the output current Set the ammeter to the 1A range and record the output current reading on the ammeter The ammeter reading should be within the limits specified in the test record card under Voltage Priority Programming Accuracy 0 5A Current limit The difference between the ammeter reading and the measurement query result should be within the limits specified under Readback Accuracy 0 5A current Turn off the output and connect a 1k ohm resistor in series with the ammeter across the output as shown in Figure B 1c You do not need a shorting switch OUTP OFF 1 OUTP ON 1 SENS CURR RANG 0 015 1 MEAS CURR 1 OUTP OFF 1 OUTP ON 1 SENS CURR RANG 0 0005 1 MEAS CURR 1 Program Commands RST OUTP ON 1 VOLT 10 1 CURR LIM 0 5 1 MEAS CURR 1 OUTP OFF 1 87 B Performance and Calibration Procedures 7 Turn on the output and program the 15mA current readback range OUTP Measure the output current SENS 8 Set the ammeter to the 10mA range and record the output current reading on the ammeter The difference between the ammeter reading and the measurement query result should be within the limits specified Readback Accuracy 15mA Current Limit 9 Turn off the output and connect a 20k ohm resistor in series with the OUTP ammeter across
121. rmine which Operation Status and Questionable Status Event register bits are set and clear the registers for the next event Use STAT OPER EVEN lt channel list gt QUES EVEN lt channel list gt You can also monitor a status signal for both its positive and negative transitions For example to generate RQS when the dc source either enters the CC constant current condition or leaves that condition program the Operational Status PTR NTR filter as follows STAT OPER PTR 8 lt channel list gt NTR 8 lt channel list gt STAT OPER ENAB 8 lt channel list gt SRE 128 lt channel list gt 52 Language Dictionary Introduction This section gives the syntax and parameters for all the IEEE 488 2 SCPI commands and the Common commands used by the de source It is assumed that you are familiar with the material in chapter 4 which explains the terms symbols and syntactical structures used here and gives an introduction to programming You should also be familiar with chapter 5 in order to understand how the dc source functions The programming examples are simple applications of SCPI commands Because the SCPI syntax remains the same for all programming languages the examples given for each command are generic Syntax Forms Syntax definitions use the long form but only short form headers or keywords appear in the examples Use the long form to help make your program self documenting Parameters Mos
122. ro the voltage limits are typically 10 75 V Figure 1 2 shows the current priority operating characteristics of the dc source The area in quadrants 1 and 3 shows the characteristics of the unit when it is being operated as a source sourcing power The area in quadrants 2 and 4 shows the characteristics of the unit when it is being operated as a load sinking power Output Key Voltage Sinking power ie 10 75V Sourcing power lt Programmable V limit VL status set 9 5V setting Output Be Current 9 5V 0 51 25mA le VL status set V limit TE 0 5125MA Figure 1 2 Output Characteristic Current Priority 16 General Information 1 The heavy line illustrates the locus of possible operating points as a function of the output load which may be purely resistive or possibly include external voltage or current sources In current priority mode the constant current loop will regulate the output current as the load changes until the positive or negative voltage limit is reached A CC constant current status flag indicates when the current loop is controlling the output If the output voltage reaches either the positive or negative voltage limit the unit no longer operates in constant current mode and the output current is no longer held constant Instead the output current is limited at either the positive or negative voltage limit line When the unit is sink
123. rrows show the transitions between states These are labeled with the input or event that causes the transition to occur l ABOR IDLE STATE lt RST INITiate NAME ACQ Yy INITIATED STATE TRIGGER RECEIVED IS AN OUTPUT CHANGE IN PROGRESS YES SETTLING DELAY v DATA ACQUIRED Figure 5 3 Model of Measurement Trigger System Enabling the Measurement Trigger System When the dc source is turned on the trigger system is in the idle state In this state the trigger system is disabled and it ignores all triggers Sending the following commands at any time returns the trigger system to the idle state ABORt RST The INITiate commands move the trigger system from the idle state to the initiated state This enables the measurement system to receive triggers To initiate the measurement trigger system use INIT NAME ACQ After a trigger is received and the data acquisition completes the trigger system will return to the idle state Thus it will be necessary to initiate the system each time a triggered measurement is desired Selecting the Measurement Trigger Source The trigger system is waiting for a trigger signal in the initiated state Before you generate a trigger you must select a trigger source The following measurement trigger sources can be selected BUS Selects GPIB bus triggers EXTernal Selects the external trigger input as the trig
124. rsely each output channel of the N3280A has its own measurement buffer This means that each output can be configured to measure a different parameter either voltage or current and a different current range However the number of measurement samples and sampling interval for each type of measurement is the same for all channels There is one voltage measurement range and three current measurement ranges The current range must be selected explicitly If a measured value exceeds the presently selected range an error message is returned Voltage measurements and current measurements using the 0 5A or 15mA range can be made to full accuracy using the default measurement sample 5 data points 30 4us intervals 152 us To achieve full accuracy on the 0 5mA current range a longer sampling interval of one power line cycle PLC is required to filter out line noise Thus a full accuracy measurement on the 0 5mA current range will typically take between 18 and 21 3 ms depending on the line frequency Note that faster measurements using lower PLC values lt 1 are only appropriate for loads that do not draw currents with a significant noise component If the load current is noisy it may be necessary to increase the sampling interval to provide additional filtering All voltage and current measurements return the average value of the samples taken Measurements can be made using either a Rectangular or Hanning window The default Rectangular window i
125. s This example assumes you want a service request generated whenever the dc source switches to the CC constant current operating mode or whenever the dc source s overvoltage overcurrent or overtemperature circuits have tripped From figure 5 5 note the required path for a condition at bit 10 CC of the Operation Status register to set bit 6 RQS of the Status Byte register Also note the required path for Questionable Status conditions at bits 0 1 and 4 to generate a service request RQS at the Status Byte register The required register programming is as follows Step 1 Program the Operation Status PTR register to allow a positive transition at bit 6 to be latched into the Operation Status Event register and allow the latched event to be summed into the Operation summary bit Use STAT OPER PTR 64 lt channel list gt ENAB 64 lt channel list gt Step 2 Program the Questionable Status PTR register to allow a positive transition at bits 0 1 or 4 to be latched into the Questionable Status Event register and allow the latched event to be summed into the Questionable summary bit Use STAT QUES PTR 19 lt channel list gt ENAB 19 lt channel list gt 1 2 16 19 Step 3 Program the Service Request Enable register to allow both the Operation and the Questionable summary bits from the Status Byte register to generate RQS Use SRE 136 8 128 136 Step 4 When you service the request read the event registers to dete
126. s CLS ESE ESE OPC 75 6 Language Dictionary IDN This query requests the dc source to identify itself It returns a string composed of four fields separated by commas Query Syntax IDN Returned Parameters lt AARD gt Field Information Agilent Technologies Manufacturer XXXXXA model number followed by a letter suffix 0 zero or the unit s serial number if available lt A gt XX XX Revision levels of firmware Example AGILENT TECHNOLOGIES N3280A 0 A 00 01 OPC This command causes the instrument to set the OPC bit bit 0 of the Standard Event Status register when the dc source has completed all pending operations See ESE for the bit configuration of the Standard Event Status register Pending operations are complete when all commands sent before OPC have been executed This includes overlapped commands Most commands are sequential and are completed before the next command is executed Overlapped commands are executed in parallel with other commands Commands that affect output voltage current or state relays and trigger actions are overlapped with subsequent commands sent to the dc source The OPC command provides notification that all overlapped commands have been completed all triggered actions are completed OPC does not prevent processing of subsequent commands but bit 0 will not be set until all pending operations are completed OPC causes the instrument to place an ASCII 1 in the Output Queu
127. s used on all 17 1 General Information measurement ranges to make fast measurements The Hanning window can be used to reduce errors caused by other periodic noise sources provided that the sample period is long enough to capture three or more noise waveform cycles Using a Hanning window will result in slower measurement speed Start of a Measurement The dc source delays the start of a measurement until a previous output voltage or current change has settled When voltage or current settings are changed in either voltage priority or in current priority mode an internal timer is started that delays any subsequent measurements At power on or after RST this delay allows the output to settle to better than 0 1 of its final value In voltage priority mode the final value is based on a 20 ohm load In current priority mode the final value is based on a short circuit load The settling delay can also be explicitly programmed This may be required for example if the load requires more or less delay than the representative load or if the measurement requires less accuracy 18 Installation Inspection Damage When you receive your dc source inspect it for any obvious damage that may have occurred during shipment If there is damage notify the shipping carrier and the nearest Agilent Sales and Support Office immediately The list of Agilent Sales and Support Offices is at the back of this guide Warranty information is printed in t
128. squez de provoquer un choc lectrique ou un incendie DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes DO NOT REMOVE THE INSTRUMENT COVER Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made only by qualified service personnel Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel SAFETY SYMBOLS WARNING Caution Direct current Alternating current Both direct and alternating current Three phase alternating current Earth ground terminal Protective earth ground terminal Frame or chassis terminal Terminal is at earth potential Used for measurement and control circuits designed to be operated with one terminal at earth potential Terminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment On supply Off supply Standby supply Units with this symbol are not completely disconnected from ac mains when this switch is off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch In position of a bi stable push control Out position of a bi stable push control Caution risk of electric shock Caution hot sur
129. st Error 0 No error Error 1 Output 1 non volatile RAM CAL section checksum failed Error 2 Output 2 non volatile RAM CAL section checksum failed Error 3 Output 3 non volatile RAM CAL section checksum failed Error 4 Output 4 non volatile RAM CAL section checksum failed Error 5 Non volatile RAM CONFIG section checksum failed Error 10 RAM selftest Runtime Error Messages Appendix C lists other error messages that may appear at runtime Line Fuse If the dc source appears dead with the Power LCD off and the fan is not running check your ac mains to be certain line voltage is being supplied to the dc source Also check that the line module on the rear of the unit is set to the correct voltage If the ac mains is normal the internal line fuse may be defective Refer to Appendix E and follow the procedure described in the appendix for accessing and replacing the line fuse located inside the unit Unless the line voltage setting is incorrect do not change the line voltage setting NOTE If the dc source has a defective fuse replace it only once If it fails again the de source requires service 29 Introduction to Programming External References GPIB References The most important GPIB documents are your controller programming manuals BASIC GPIB Command Library for MS DOS etc Refer to these for all non SCPI commands for example Local Lockout The following are two formal documents concerning the GPIB interface ANSIJI
130. stant voltage CC The selected output is in constant current Current priority mode only _ Voltage priority mode only STATus OPERation CONDition This query returns the value of the Operation Condition register That is a read only register which holds the live unlatched operational status of the de source Query Syntax STATus OPERation CONDition lt channel list gt Parameters None Examples STAT OPER COND 1 STATUS OPERATION CONDITION 1 Returned Parameters lt NR 1 gt register value STATus OPERation ENABle This command and its query set and read the value of the Operational Enable register This register is a mask for enabling specific bits from the Operation Event register to set the operation summary bit OPER of the Status Byte register This bit bit 7 is the logical OR of all the Operatonal Event register bits that are enabled by the Status Operation Enable register Command Syntax STATus OPERation ENABle lt NRf gt lt channel list gt Parameters 0 to 32767 Preset Value 0 Examples STAT OPER ENAB 1312 1 Query Syntax STATus OPERation ENABle lt channel list gt Returned Parameters lt NR 1 gt register value Related Commands STAT OPER 69 6 Language Dictionary STATus OPERation NTR STATus OPERation PTR These commands set or read the value of the Operation NTR Negative Transition and PTR Positive Transition registers These registers serve as polarity filters between th
131. t in the performance test record card under Current Priority Transient Response Current Turn off the output of the de source before connecting the function generator Program Commands OUTP OFF 1 OUTP ON 1 SOUR FUNC MODE CURR 1 CURR 0 1 Loading Transient i Unloading Transient Performance and Calibration Procedures Utilities Help 6 05 PM File Control Setup Measure Analyze ejoa wi Figure B 3 Transient Waveform Current Priority Performance Test Equipment Form Test Facility Report Number Date Customer Tested By Model Ambient Temperature C Serial No Relative Humidity Options Nominal Line Frequency Firmware Revision Special Notes Test Equipment Used Description Model No Trace No Cal Due Date AC Source DC Voltmeter RMS Voltmeter Oscilloscope Electronic Load 97 B Performance and Calibration Procedures Performance Test Record Form Model Agilent N3280A Output 1 Test Description Minimum Maximum Specification Specification VOLTAGE PRIORITY TESTS Programming Accuracy DMM readings Voltage 0V 2mV Voltage 10V 9 988 V Voltage 10V 9 988 V ImA Current limit 0 949mA 0 5A Current limit 0 49945 A 1mA Current limit 0 949mA 0 5A Current limit 0 49945 A Readback Accuracy MEAS readings
132. t down and be disabled automatically opening the output and sense relays This leaves the output in a high impedance state The full 512 5 milliampere output current is available only in voltage priority mode In this mode the output voltage should be programmed to the desired positive or negative value A positive current limit value should also be programmed Note that the negative current limit tracks the positive current limit set point The output will regulate at the desired voltage level provided that the current limit has been set higher that the actual output current requirement of the external load Note that if the current limit is set to a value between zero and 75 uA the actual current limit will be 75 uA Thus it is not possible to program current limit values less than 75 uA in voltage priority mode This limitation does not apply in current priority mode Current Priority Operation Each Agilent N3280A output is a four quadrant bipolar dc source that can be operated in either voltage or current priority mode In current priority mode the output is controlled by a bi polar constant current feedback loop which maintains the output current source or sink at its programmed setting The output current will remain at its programmed setting as long as the load voltage remains within the positive and negative voltage limits The voltage limits are not programmable and vary somewhat with the output current When the output current is ze
133. t commands require a parameter and all queries will return a parameter The range for a parameter may vary according to the model of dc source When this is the case refer to the Specifications table in Appendix A Related Where appropriate related commands or queries are included These are listed Commands because they are either directly related by function or because reading about them will clarify or enhance your understanding of the original command or query Order of The dictionary is organized according to the following functions calibration display Presentation measurement output status system trigger and common commands Both the subsystem commands and the common commands that follow are arranged in alphabetical order under each heading Subsystem Commands Subsystem commands are specific to functions They can be a single command or a group of commands The groups are comprised of commands that extend one or more levels below the root The subsystem command groups are arranged according to function Calibration Display Measurement Output Status System and Trigger Commands under each function are grouped alphabetically Commands followed by a question mark take only the query form When commands take both the command and query form this is noted in the syntax descriptions Table 6 1 lists all of the subsystem commands in alphabetical order Common Commands Common commands begin with an and consist of three l
134. tage requirements and ambient operating temperature range BEFORE APPLYING POWER Verify that the product is set to match the available line voltage the correct fuse is installed and all safety precautions are taken Note the instrument s external markings described under Safety Symbols GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cover must be connected to an electrical ground The instrument must be connected to the ac power mains through a grounded power cable with the ground wire firmly connected to an electrical ground safety ground at the power outlet Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury ATTENTION Un circuit de terre continu est essentiel en vue du fonctionnement s curitaire de l appareil Ne jamais mettre l appareil en marche lorsque le conducteur de mise la terre est d branch FUSES Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard Vous devrez imp rativement utiliser des fusibles calibr s aux sp cifications de courant tension et type coupure d lai de coupure etc N utilisez jamais de fusibles r par s et ne court circuitez pas les supports de fusibles Sinon vous ri
135. tance as low as possible as illustrated in the figure The addition of a low leakage RC network may help improve output transient response when the unit is operating in voltage priority mode 22 Installation 2 OUTPUT 1 MATING PLUG SHOWN TIGHTEN a LOCKING SCREW gt Y Hsen Hi Lo Lsen O HHHH INSERT P E lt 7 ale T Enns KEEP RESISTNCE AND INDUCTANCE LOW USE TWISTED PAIR OR SANDWICHED PCB TRACKS TWIST PAIR aa d FIXTURE ADDITION OF LOW LEAKAGE CONNECTIONS RC NETWORK MAY IMPROVE TRANSIENT RESPONSE IN VOLTAGE PRIORITY MODE Figure 2 4 Remote Sense Connections with Test Fixture Current Ratings The following table lists the characteristics of AWG American Wire Gauge copper wire for some common wire sizes that can be accommodated in the output connectors Table 2 2 Ampacity and Resistance of Stranded Copper Conductors AWG No Maximum Ampacity in Resistance at 20 deg C free air Q m Q ft 0 0843 0 0257 0 0531 0 0162 0 0331 0 0101 0 0210 0 00639 0 0132 0 00402 Voltage Drops and Lead Resistance To optimize the performance and transient response in your test system please observe the following guidelines Twist the load leads together and keep them short The shorter the leads the better the performance Twist the sense leads together but do not bundle the sense leads with the load leads For best performance keep the total cable le
136. te CURRent LEVel lt channel gt None CAL CURR 1 start current calibration CAL CURR LIM CAL CURR MEAS CALibrate CURRent LIMit POSitive CALibrate CURRent LIMit NEGative This command initiates the calibration of the positive or negative current limit Command Syntax Parameters Examples Related Commands CALibrate CURRent LIMit POSitive lt channel gt CALibrate CURRent LIMit NEGative lt channel gt None CAL CURR LIM 1 CAL CURR LIM NEG 1 CAL CURR CAL CURR MEAS CALibrate CURRent MEASure This command initiates the calibration of the 0 5A or 15mA current range measurement circuit Command Syntax Parameters Unit Examples Related Commands CALibrate CURRent MEA Sure lt NRf gt lt channel gt A value that falls within the 0 5A or 15mA current range A amperes CAL CURR MEAS 0 5 1 0 5A range CAL CURR MEAS 0 005 1 15mA range CAL CURR CAL CURR LIM 57 6 Language Dictionary CALibrate DATA This command enters a calibration value that you obtain by reading an external meter You must first select a calibration level with CALibrate LEVel for the value being entered Command Syntax Parameters Unit Examples Related Commands CALibrate DATE CALibrate DATA lt NRf gt lt external reading gt A or V amperes or volts CAL DATA 3222 3 MA CAL DATA 5 000 CAL STAT CAL LEV This command stores the date the unit was last calibrated Enter any ASCII string
137. ter and an oscilloscope are used connect each to the terminals by a separate pair of leads to avoid mutual coupling effects For constant voltage dc tests connect only to HI sense and LO sense terminals since the unit regulates the voltage that appears at the sense terminals not the output terminals Use twisted pair wiring to avoid noise pickup on the test leads NOTE When using the Agilent 3458A as an ammeter always select the specific current measurement range that you will be using Do not use the autoranging feature of the ammeter as this may introduce noise in your current measurements by toggling between measurement ranges Always use the lowest range possible to provide the best measurement accuracy 84 Performance and Calibration Procedures Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power For most tests an electronic load is considerably easier to use than load resistors but it may not be fast enough to test transient recovery time and may be too noisy for the noise PARD tests NOTE When using an electronic load with a bi polar de source be sure to reverse the polarity of the load connections to match the appropriate polarity Fixed load resistors may be used in place of a variable load with minor changes to the test procedures If resistors are used switches should also used to connect disconnect or short the load resistors Programming You
138. ting slightly If you adjusted the current limit close the switch and go back to step 3 6 Record the output current reading on the ammeter full load current value The difference between the two current readings is the Load effect current and should be within the limits listed in the performance test record card under Voltage Priority Source Effect Current Voltage Priority Current Limit Load Effect Test This test measures the change in output current resulting from a change in output voltage from about zero volts to about 10 volts Action Program Commands 1 Turn off the dc source and connect the output as shown in Figure B lc RST with an ammeter in series with a 20 ohm load resistor across the Hi and Lo output terminals Also connect a shorting switch across the resistor 2 Start with a short across the output switch closed Turn on the dc OUTP ON 1 source and program the output voltage to the maximum negative value VOLT 10 25 1 y 10 25V and the current limit to 0 5A CURR LIM 0 5 1 3 Set the ammeter to the 1A range and record the output current reading on the ammeter shorted output value 4 Remove the short open the switch from the output of the dc source 5 Read back the N3280A status to be sure that it s in the CL mode This STAT OPER COND 1 query should return a Bit value of 4 for CL mode If it is not in CL mode decrease the current limit setting sl
139. to 0 5A 10 With 1k load resistor program current from 0 5mA to 0 5mA Measure time from 0 4mA to 0 4mA 80 Specifications A Table A 2 Supplemental Characteristics continued Programming Output Voltage 90 to 10 Fall Time 10kHz Curr Lim 90 to 10 Curr Lim 3 90 to 10 Current ye 80 to 80 Maximum Output Cable Impedance Overvoltage Protection Positive 11 5V 0 3V N A mee e Output Common Mode shorting either Hi or Low lt 2uA rms Triggerin SOO Chassis ground referenced TTL levels Trigger latency ooo 80s maximum OEf o A E Capabilities L4 PPO RL1 SH1 SR1 T6 Da LL sinsiy donators Linearly derated to 50 of full current at 55 C Cees oupuimtns neers isgonnnay 00g Output impedance in open state is approximately 100K Altitude Derating Up to 7500 feet Full current 40 C gt 7500 feet up to 15000 Derated by 1 1 degrees C for every additional 1000 feet feet Secondary Isolation To Chassis 50V to Output S lt PF evel A SES A o ae oaa O Regulatory Compliance Listing pending UL 3111 1 Certified to CSA 22 2 No 1010 1 Conforms to IEC 1010 1 EN 61010 1 Complies with EMC directive 89 336 EEC ISM group 1 Class A Calibration Interval near _ k ight 3 5 88 9 mm 8 3 8 212 7 mm 19 6 497 8 mm Net 22 lbs 10 kg C TESTS STS Input Current current Input Power Line Fuse Voltage Range Mex f Typ 100 Vac 87 106
140. to the trigger Positive values represent the delay after the trigger occurs but before the samples are acquired Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands 62 SENSe SWEep OFFSet POINts lt NRf gt 4095 through 2 000 000 000 0 SENS SWE OFFS POIN 2047 SENSe SWEep OFFSet POINts lt NR3 gt SENS SWE TINT SENS SWE POIN MEAS ARR SENSe SWEep POINts Language Dictionary 6 This command defines the number of points in a measurement Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands SENSe SWEep POINts lt NRf gt 1 through 4096 5 SENS SWE POIN 1024 SENSe SWEep POINts lt NR3 gt SENS SWE TINT SENS SWE OFFS MEAS ARR SENSe SWEep TINTerval This command defines the time period between samples The value that you enter for the time interval will be rounded to the nearest 30 4 microsecond increment Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands SENSe WINDow SENSe SWEep TINTerval lt NRf gt 30 4 microseconds through 60800 seconds 30 4 microseconds SENS SWE TINT 60 8E 6 SENSe SWEep TINTerval lt NR3 gt SENS SWE POIN SENS SWE OFFS MEAS ARR This command sets the window function that is used in dc measurement calculations The following functions can be selected HANNing A signal conditioning window that reduces errors in dc me
141. true and latches RQS into bit 6 of the Status Byte register When the controller does a serial poll RQS is cleared inside the register and returned in bit position 6 of the response The remaining bits of the Status Byte register are not disturbed The MAV Bit and Output Queue The Output Queue is a first in first out FIFO data register that stores dc source to controller messages until the controller reads them Whenever the queue holds one or more bytes it sets the MAV bit 4 of the Status Byte register 51 5 Programming the DC Source Determining the Cause of a Service Interrupt You can determine the reason for an SRQ by the following actions Step 1 Determine which summary bits are active Use STB or serial poll Step 2 Read the corresponding Event register for each summary bit to determine which events caused the summary bit to be set Use STAT QUES EVEN lt channel list gt STAT OPER EVEN lt channel list gt ESR When an Event register is read it is cleared This also clears the corresponding summary bit Step 3 Remove the specific condition that caused the event If this is not possible the event may be disabled by programming the corresponding bit of the status group Enable register or NTR PTR filter A faster way to prevent the interrupt is to disable the service request by programming the appropriate bit of the Service Request Enable register Servicing Operation Status and Questionable Status Event
142. turn option number RST Reset SRE lt n gt Set service request enable register SRE Return service request enable register STB Return status byte TRG Trigger TST Perform selftest then return result WAI Hold off bus until all device commands done Table 6 3 Output Programming Parameters SOUR CURR LEV IMM and 0 5125 mA to 0 5125 mA SOUR CURR LEV TRIG SOUR CURR LIM IMM and 754A to 0 5125 A SOUR CURR LIM TRIG 75uA to 0 5125 A SOUR VOLT LEV IMM and 10 25 V to 10 25 V SOUR VOLT LEV TRIG RST Voltage Value Oo wy SOUR DEL 0 1000 RST Current Level Value OA RST Current Limit Value 75 UA 0V 56 Language Dictionary 6 Calibration Commands Calibration commands let you enable and disable the calibration mode change the calibration password calibrate current and voltage programming and store new calibration constants in nonvolatile memory Only one output channel may be calibrated at a time NOTE If calibration mode has not been enabled with CALibrate STATe programming the calibration commands will generate an error You must also save any changes that you made using CALibrate SAVE otherwise all changes will be lost when you exit calibration mode CALibrate CURRent This command initiates the calibration of the current priority mode as well as the 0 5mA current range measurement circuit Command Syntax Parameters Examples Related Commands CALibra
143. turned to a service facility designated by Agilent Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent Technologies for warranty service Except for products returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DI
144. u can provide a negative going TTL signal to the trigger input or momentarily connect a short contact closure from the trigger input pin to the chassis ground pin on the trigger connector In any case the device that you use to implement the trigger must be able to sink approximately 1mA The external trigger input can trigger both output voltage current changes and output measurements Computer Connections The dc source can be controlled through a GPIB interface GPIB Interface Follow the GPIB card manufacturer s directions for card installation and software driver setup Dc sources may be connected to the GPIB interface in series configuration star configuration or a combination of the two provided the following rules are observed The total number of devices including the GPIB interface card is no more than 15 The total length of all cables used is no more than 2 meters times the number of devices connected together up to a maximum of 20 meters Refer to table 1 2 for a list of available GPIB cables Do not stack more than three connector blocks together on any GPIB connector e Make sure all connectors are fully seated and the lock screws are firmly finger tightened 25 2 Installation GPIB Address Each dc source has its own GPIB bus address which can be set using the rear panel Address switch The dc source is shipped with its GPIB address set to 5 Refer to the following table for additional address swit
145. uesting service 77 6 Language Dictionary Table 6 8 Bit Configuration of Status Byte Register Bit Position 7 6 1 Pa eaa Oe ite eee ere tae RQS iG pe OPER Operation status summary MAV Message available MSS Master status summary QUES Questionable status summary RQS Request for service WAI Waiting for a trigger ESB Event status byte summary Query Syntax STB Returned Parameters lt NR1 gt register binary value TRG This common command generates a trigger when the trigger subsystem has BUS selected as its source The command has the same affect as the Group Execute Trigger lt GET gt command Command Syntax TRG Parameters None Related Commands ABOR INIT TRIG IMM lt GET gt TST This query causes the dc source to do a self test and report any errors 0 indicates that the dc source passed self test 1 indicates that one or more tests failed Selftest errors are written to the error queue see Appendix C Query Syntax TST Returned Parameters lt NRI gt WAI This command instructs the dc source not to process any further commands until all pending operations are completed Pending operations are as defined under the OPC command WAI can be aborted only by sending the de source an GPIB DCL Device Clear command Command Syntax WAI Parameters None Related Commands OPC OPC 78 Specifications Introduction Table A 1 lists the specifications of th
146. unctionality of the display You should be able to hear the fan and feel air coming from the back of the unit Turn the output on Check the voltmeter display to verify the voltage programming Reads the voltage of output 1 This should agree with the value displayed on the voltmeter Check the voltmeter display to verify the voltage programming Reads the voltage of output 1 This should agree with the value displayed on the voltmeter Turn the output off Use the ammeter to short the output of the unit and verify the output current Turn the output on Program the unit for current priority mode Reads the current of output 1 This should agree with the value displayed on the ammeter Turn the output off Substitute the channel that you are programming after the symbol For example if you are programming channel 2 program 2 in all commands Turn On Checkout 3 In Case of Trouble De source failure may occur during power on selftest or during operation Either the Error or the Prot indicator on the front panel may be lit to indicate that a failure has occurred If this occurs turn the power off and then back on to see if the error persists If the error persists the dc source requires service Selftest Error Messages Error numbers and messages are read back with the SYSTem ERRor query SYSTem ERRor returns an NR1 and a string error message Table 3 1 Power On Selftest Errors Error No Failed Te
147. utputs 1 4 have a termination for the Hi and Lo output terminals the Hi and Lo sense terminals a guard terminal and an earth ground terminal see figure 2 3 For proper operation of the dc source you must connect the Hi sense and Lo sense terminals to their respective high and low monitoring points Install the connector plug with its sense terminals connected before applying power to the unit CAUTION Connect the sense leads carefully so that they do not become open circuited If the sense leads are left unconnected or become open during operation the de source will revert to a local sense mode using internal sense protect resistors This will result in an incorrect voltage being applied at the load terminals The 6 pin connector is removable and accepts wires sizes from AWG 28 to AWG 16 Insert the wire into the wire terminal then use a small flat bladed screwdriver to tighten the wire terminal Agilent Technologies does not recommend using wire sizes smaller than AWG 24 After you insert the mating plug into the output connector tighten the two locking screws to secure the connection OUTPUT 1 MATING PLUG SHOWN TIGHTEN LOCKING SCREW mA Teen S Ce T T _ TWIST LEADS Paa TWIST PAIR lt Figure 2 3 Remote Sense Connections Figure 2 4 shows how to connect remote sense and load leads when using a removable test fixture For best transient response and load regulation keep the resistance and induc
148. will be 350 TOO MANY ERRORS see Appendix C for other error codes Query Syntax SYSTem ERRor Parameters None Returned Parameters lt NR1 gt lt SRD gt Examples SYST ERR SYSTem VERSion This query returns the SCPI version number to which the instrument complies The returned value is of the form YYYY V where YYYY represents the year and V is the revision number for that year Query Syntax SYSTem VERSion Parameters None Returned Parameters lt NR2 gt Examples SYST VERS 72 Language Dictionary 6 Trigger Commands Trigger commands consist of trigger and initiate commands Initiate commands initialize the trigger system Trigger commands control the remote triggering of the dc source They are used to generate output and measurement triggers NOTE Before you generate a measurement trigger you must specify either a voltage or current measurement acquisition using the SENSe FUNCtion command ABORt This command cancels any trigger actions presently in process Pending trigger levels are reset to their corresponding immediate values ABORt also resets the WTG bit in the status byte see chapter 5 about programming the status registers ABORt is executed at power turn on and upon execution of RST Command Syntax ABORt Parameters None Examples ABOR Related Commands INIT RST TRG TRIG INITiate NAME This command controls the enabling of both output and measurement triggers When a trigger is enabled an event
149. without tying up the computer is to use the SCPI command completion commands For example you can send the OPC command after INITialize then occasionally poll the OPC status bit in the standard event status register for status completion while doing other tasks You can also set up an SRQ condition on the OPC status bit going true and do other tasks until the SRQ interrupts Pre trigger and Post trigger Data Acquisition The measurement system lets you capture data before after or at the trigger signal When a measurement is initiated the dc source continuously samples the instantaneous signal level of the sensing function As shown in figure 5 4 you can move the block of data being read into the acquisition buffer with reference to the acquisition trigger This permits pre trigger or post trigger data sampling To offset the beginning of the acquisition buffer relative to the acquisition trigger use SENS SWE OFFS POIN lt offset gt The range for the offset is 4096 to 2 000 000 000 points As shown in the figure when the offset is negative the values at the beginning of the data record represent samples taken prior to the trigger When the value is 0 all of the values are taken after the trigger Values greater than zero can be used to program a delay time from the receipt of the trigger until the data points that are entered into the buffer are valid Delay time offset x sample period NOTE If during a pre trigger data acquisiti
150. you expect to measure see table 6 3 A amperes 0 5A SENS CURR RANG 0 4 1 SENSe CURRent RANGe lt channel list gt lt NR3 gt 61 6 Language Dictionary SENSe FUNCtion This command configures the sensing function for triggered measurements The dc source has two measurement sensors as described below The query returns the function setting CURRent VOLTage Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Senses the output current at the selected output Senses the output voltage at the selected output SENSe FUNCtion lt function gt lt channel list gt VOLTage CURRent VOLT SENS FUNC SENSe FUNCtion lt channel list gt lt SRD gt VOLT 1 SENSe SWEep NPLCycles This command specifies the total measurement acquisition time in terms of ac power line cycles It automatically sets the sweep time interval sweep offset and sweep points The values are chosen to sample the maximum number of points possible and to provide the best noise filtering Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters SENSe SWEep NPLCycles lt NRf gt 1 through lt n gt 0 00912 for 60Hz line 0 0076 for 50Hz line SENS SWE NPLC 10 SENSe SWEep NPLCycles lt NR3 gt SENSe SWEep OFFSet POINts This command defines the offset in a data sweep when an acquire trigger is used Negative values represent data samples taken prior

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