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HP 34401A User's Guide

1. User s Guide Part Number 34401 90004 February 1996 For Safety information Warranties and Regulatory information see the pages behind the Index O Copyright Hewlett Packard Company 1991 1996 All Rights Reserved HP 34401A Multimeter Remote Interface Reference ee Sor Remote Interface Reference e Command Summary starting on page 105 e Simplified Programming Overview starting on page 112 e The MEASure and CONFigure Commands starting on page 117 e Measurement Configuration Commands starting on page 121 e Math Operation Commands starting on page 124 e Triggering starting on page 127 e Triggering Commands starting on page 130 e System Related Commands starting on page 132 e The SCPI Status Model starting on page 134 e Status Reporting Commands starting on page 144 e Calibration Commands on page 146 e RS 232 Interface Configuration starting on page 148 e RS 232 Interface Commands on page 153 e An Introduction to the SCPI Language starting on page 154 e Output Data Formats on page 159 e Using Device Clear to Halt Measurements on page 160 e TALK ONLY for Printers on page 160 e To Set the HP IB Address on page 161 e To Select the Remote Interface on page 162 e To Set the Baud Rate on page 163 e To Set the Parity on page 164 e To Select the Programming Language on page 165 e Alternate Programming Language Compatibility starting on page 166 e SCPI Compliance Informati
2. MIN MAX DEF FRESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF FREQuency lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF PERiod lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CONTinuity DIODe CONFigure VOLTage DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF VOLTage DC RATio lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF VOLTage AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF RESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF FRESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF FREQuency lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF PERiod range MIN MAX DEF lt resolution gt MIN MAX DEF CONTinuity DIODe CONFigure 105 Chapter 4 Remote Interface Reference Command Summary Measurement Configuration Commands see page 121 for more information SENSe FUNCtion FUNCtion FUNCtion tion tion tion tion tion tion tion tion tion a ANAANQAQAQQIQNQAAQNNN SENSe VOLTage VOLTage VOLTage VOLTage CURRent CURRent CURRent CURRent RESistan
3. RESistan VOL VOL VOL Ou CU Tage Tage Tage RRent RRent DC DC RATi AC DC TACT RESistance FRESistance FREQuency PER CO iod Tinu DIODe 2 DC DC AC AC DC DC AC AC ce ce RA RA RA RA RA RA RA RA RA RA Ge Ge Ge Ge Ge Ge Ge Ge Ge Ge ity lt range gt INimu lt range gt INimu lt range gt INimu lt range gt INimu lt range gt INimu o 2 wire ohms 4 wire ohms MINimum MAXimum m MAXimum MINimum MAXimum m MAXimum MINimum MAXimum m MAXimum MINimum MAXimum m MAXimum MINimum MAXimum m MAXimum FRESistance RANGe lt range gt MINimum MAXimum FRESistance RANGe MINim FREQuency VOLTage RANGe lt range gt MINimum MAXimum FREQuency VOLTage RANGe PERiod VOLTage RANGe lt range gt MINimum MAXimum PERiod VOLTage RANGe MI SENSe VOLTage VOLTage VOLTage VOLTage CURRent CURRent CURRent CURRent RESistan RESistan RA RA RA RA RA RA RA RA ce ce RA RA Ge Ge Ge Ge Ge Ge Ge Ge Ge Ge AUTO OF AUTO OF AUTO AUTO AUTO OF AUTO AUTO OF AUTO AUTO OF AUTO FRESistance RANGe AUTO 0 FRESistance RANGe AUTO FREQuency VOLTage RANGe AUTO OFF ON FREQuency VOLTage RANGe AUTO PERiod VOLTage RANGe AUTO OFF ON PERiod VOLTage RANGe AUT
4. TRIG SOUR EXT READ bus enter statement The following program segment is similar to the program above but it uses INITiate to place the multimeter in the wait for trigger state The INITiate command places the multimeter in the wait for trigger state takes a reading when the Ext Trig terminal is pulsed and sends the reading to the multimeter s internal memory The FETCh command transfers the reading from internal memory to the output buffer CONF VOLT DC 10 0 003 TRIG SOUR EXT INIT FETC bus enter statement Storing readings in memory using the INITiate command is faster than sending readings to the output buffer using the READ command The multimeter can store up to 512 readings in internal memory If you configure the multimeter to take more than 512 readings using the sample count and trigger count and then send INITiate a memory error is generated After you execute an INITiate command no further commands are accepted until the measurement sequence is completed However if you select TRIGger SOURce BUS the multimeter will accept the TRG command bus trigger or an IEEE 488 Group Execute Trigger message 116 Chapter 4 Remote Interface Reference The MEASure and CONFigure Commands The MEASure and CON Figure Commands See also Measurement Configuration starting on page 51 in chapter 3 e For the range parameter MIN selects the lowest range for the selected functio
5. lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and make a dc current measurement with the specified range and resolution The reading is sent to the output buffer 117 Chapter 4 Remote Interface Reference The MEASure and CONFigure Commands MEASure CURRent AC lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and make an ac current measurement with the specified range and resolution The reading is sent to the output buffer For ac measurements resolution is actually fixed at 6 digits The resolution parameter only affects the front panel display MEASure RESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and make a 2 wire ohms measurement with the specified range and resolution The reading is sent to the output buffer MEASure FRESistance lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and make a 4 wire ohms measurement with the specified range and resolution The reading is sent to the output buffer MEASure FREQuency lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and make a frequency measurement with the specified range and resolution The reading is sent to the output buffer For frequency measurements the multimeter uses one range for all inputs between 3 Hz and 300 kHz With no input signal applied frequency measurements return 0 MEASure PERiod range MIN MAX DEF reso
6. Enable Register Not Used 0 Not Used ESR 11 Limit Test Fail LO Not Used Ya 12 Limit Test Fail HI Not Used Not Used 35 Questionable Data OR OPC Not Used 45 Message Available 15 Not Used 55 Standard Event STAT QUES EVEN STAT QUES ENAB value gt Request Service FOUES ENAB OPC STAT QUES ENAB slca Serial Poll SPOLL SRE lt value gt Standard Event pe poko Event Register Enable Register PSC 011 0 Operation Complete p Not Used SC 2 Query Error Output Buffer 8 Device Error 4 Execution Error OR SRE lt enable value gt e free SRE Not Used 7 Power On ESR ESE lt value gt STB ai Calibration Commands see page 146 for more information CALibration CALibration COUNt CALibration SECure CODE new code SECure STATe OFF ON code SECure STATe CALibration STRing lt quoted string STRing CALibration VALue value VALue Default parameters are shown in bold 110 Chapter 4 Remote Interface Reference Command Summary RS 232 Interface Commands see page 148 for more information SYSTem LOCal SYSTem REMote SYSTem RWLock IEEE 488 2 Common Commands see page 169 for more information CLS ESE lt enable value gt ESE ESR IDN OPC KORG PSC 011 PSC RST SRE lt enable value gt SRE STB TRG TET Default parameters are shoun in bold 111 First
7. Stored in volatile memory CALCulate AVERage COUNt Read the number of readings taken since min max was enabled The multimeter clears the value when min max is turned on when power has been off or after a remote interface reset Stored in volatile memory CALCulate NULL OFFSet lt value gt MINimum MAXimum Store a null value in the multimeter s Null Register You must turn on the math operation before writing to the math register You can set the null value to any number between 0 and 120 of the highest range for the present function MIN 120 of the highest range MAX 120 of the highest range Stored in volatile memory CALCulate NULL OFFSet MINimum MAXimum Query the null value CALCulate DB REFerence lt value gt MINimum MAXimum Store a relative value in the dB Relative Register You must turn on the math operation before writing to the math register You can set the relative value to any number between 0 dBm and 200 dBm MIN 200 00 dBm MAX 200 00 dBm Stored in volatile memory CALCulate DB REFerence MINimum MAXimum Query the dB relative value 125 Chapter 4 Remote Interface Reference Math Operation Commands CALCulate DBM REFerence lt value gt MINimum MAXimum Select the dBm reference value Choose from 50 75 93 110 124 125 135 150 250 300 500 600 800 900 1000 1200 or 8000 ohms MIN 50 Q MAX 8000 Q Stored in non volatile memory CALCulate DBM R
8. TRIGger COUNt lt valwe gt MINimum MAXimum INFinite Set the number of triggers the multimeter will accept before returning to the idle state Select from 1 to 50 000 triggers The INFinite parameter instructs the multimeter to continuously accept triggers you must send a device clear to return to the idle state Trigger count is ignored while in local operation MIN 1 MAX 50 000 Stored in volatile memory TRIGger COUNt MINimum MAXimum Query the trigger count If you specify an infinite trigger count the query command returns 9 90000000E 37 131 Chapter 4 Remote Interface Reference System Related Commands System Related Commands See also System Related Operations starting on page 84 in chapter 3 FETCh Transfer readings stored in the multimeter s internal memory by the INITiate command to the multimeter s output buffer where you can read them into your bus controller READ Change the state of the trigger system from the idle state to the wait for trigger state Measurements will begin when the specified trigger conditions are satisfied following the receipt of the READ command Readings are sent immediately to the output buffer DISPlay OFF ON Turn the front panel display off or on Stored in volatile memory DISPlay Query the front panel display setting Returns 0 OFF or 1 ON DISPlay TEXT lt quoted string gt Display a message on the f
9. fixed at 10 MQ for all ranges With AUTO ON the resistance is set to gt 10 GQ for the 100 mV 1 V and 10 V ranges Stored in volatile memory INPut IMPedance AUTO Query the input resistance mode Returns 0 OFF or 1 ON ROUTe TERMinals Query the multimeter to determine if the front or rear input terminals are selected Returns FRON or REAR 123 Chapter 4 Remote Interface Reference Math Operation Commands Math Operation Commands See also Math Operations starting on page 63 in chapter 3 There are five math operations available only one of which can be enabled at a time Each math operation performs a mathematical operation on each reading or stores data on a series of readings The selected math operation remains in effect until you disable it change functions turn off the power or perform a remote interface reset The math operations use one or more internal registers You can preset the values in some of the registers while others hold the results of the math operation The following table shows the math measurement function combinations allowed Each X indicates an allowable combination If you choose a math operation that is not allowed with the present measurement function math is turned off If you select a valid math operation and then change to one that is invalid a Settings conflict error is generated over the remote interface For null and dB measurement
10. time SCPI users see page 154 Chapter 4 Remote Interface Reference Simplified Programming Overview Simplified Programming Overview You can program the multimeter to take measurements from the remote interface using the following simple seven step sequence Place the multimeter in a known state often the reset state Change the multimeter s settings to achieve the desired configuration Set up the triggering conditions Initiate or arm the multimeter for a measurement Trigger the multimeter to make a measurement Retrieve the readings from the output buffer or internal memory Read the measured data into your bus controller TAB VIN P The MEASure and CONFigure commands provide the most straight forward method to program the multimeter for measurements You can select the measurement function range and resolution all in one command The multimeter automatically presets other measurement parameters ac filter autozero trigger count etc to default values as shown below MEASure and CONFigure Preset States Command MEASure and CONFigure Setting AC Filter DET BAND 20 Hz medium filter Autozero ZERO AUTO OFF if resolution setting results in NPLC lt 1 ON if resolution setting results in NPLC gt 1 Input Resistance INP IMP AUTO OFF fixed at 10 Ma for all dc voltage ranges Samples per Trigger SAMP COUN 1 sample Trigger Count TRIG COUN 1 trigger Trigger Delay TRIG DEL Automatic delay Tri
11. 4 Remote Interface Reference Measurement Configuration Commands Measurement Configuration Commands See also Measurement Configuration starting on page 51 in chapter 3 FUNCtion function Select a measurement function The function must be enclosed in quotes in the command string FUNC VOLT DC Specify one of the following strings VOLTage DC FRESistance 4 wire ohms VOLTage DC RATio FREQuency VOLTage AC PERiod CURRent DC CONTinuity CURRent AC DIODe RESistance 2 wire ohms FUNCtion Query the measurement function and return a quoted string function RANGe range MINimum MAXimum Select the range for the selected function For frequency and period measurements ranging applies to the signal s input voltage not its frequency use FREQuency VOLTage or PERiod VOLTage MIN selects the lowest range for the selected function MAX selects the highest range Stored in volatile memory lt function gt RANGe MINimum MAXimum Query the range for the selected function lt function gt RANGe AUTO OFF ON Disable or enable autoranging for the selected function For frequency and period use FREQuency VOLTage or PERiod VOLTage Autorange thresholds Down range at lt 10 of range Up range at gt 120 of range Stored in volatile memory lt function gt RANGe AUTO Query the autorange setting Returns 0 OFF or 1 ON 121 Chapter 4 Remote Interface
12. EFerence MINimum MAXimum Query the dBm reference resistance CALCulate LIMit LOWer value MINimum MAXimum Set the lower limit for limit testing You can set the value to any number between 0 and 120 of the highest range for the present function MIN 120 of the highest range MAX 120 of the highest range Stored in volatile memory CALCulate LIMit LOWer MINimum MAXimum Query the lower limit CALCulate LIMit UPPer value MINimum MAXimum Set the lower limit for limit testing You can set the value to any number between 0 and 120 of the highest range for the present function MIN 120 of the highest range MAX 120 of the highest range Stored in volatile memory CALCulate LIMit UPPer MINimum MAXimum Query the upper limit DATA FEED RDG STORE CALCulate Selects whether readings taken using the INITiate command are stored in the multimeter s internal memory default or not stored at all In the default state DATA FEED RDG_STORE CALC up to 512 readings are stored in memory when INITiate is executed The MEASure and CONFigure commands automatically select CALC With memory disabled DATA FEED RDG_STORE readings taken using INITiate are not stored This may be useful with the min max operation since it allows you to determine an average of the readings without storing the individual values An error will be generated if you attempt to transfer readings to the output buff
13. ITiate or READ command to initiate the measurement 113 Chapter 4 Remote Interface Reference Simplified Programming Overview Using the range and resolution Parameters With the MEASure and CONFigure commands you can select the measurement function range and resolution all in one command Use the range parameter to specify the expected value of the input signal The multimeter then selects the correct measurement range For frequency and period measurements the multimeter uses one range for all inputs between 3 Hz and 300 kHz The range parameter is required only to specify the resolution Therefore it is not necessary to send a new command for each new frequency to be measured Use the resolution parameter to specify the desired resolution for the measurement Specify the resolution in the same units as the measurement function not in number of digits For example for dc volts specify the resolution in volts For frequency specify the resolution in hertz You must specify a range to use the resolution parameter Using the READ Command The READ command changes the state of the trigger system from the idle state to the wait for trigger state Measurements will begin when the specified trigger conditions are satisfied following the receipt ofthe READ command Readings are sent inmediately to the output buffer You must enter the reading data into your bus controller or the multimeter will stop makin
14. Nimum MAXimum DELay MINimum MAXimum TRIGger DELay AUTO OFF ON DELay AUTO SAMPle COUNt lt value gt MINimum MAXimum COUNt MINimum MAXimum TRIGger COUNt lt value gt MINimum MAXimum INFinite COUNt MINimum MAXimum System Related Commands see page 132 for more information FETCh SYSTem ERRor READ SYSTem VERSion DISPlay OFF ON DATA POINts DISP lay RST DISPlay TEXT lt quoted string gt TST TEXT 3 TEXT CLEar IDN SYSTem LI BEEPer L2 BEEPer STATe OFF ON L3 BEEPer STATe Default parameters are shown in bold 109 Chapter 4 Remote Interface Reference Command Summary Status Reporting Commands see page 144 for more information SYSTem ERRor STATus QUEStionable ENABle lt enable value gt QUEStionable ENABle QUEStionable EVENt anye pon Binary Weights Event Register Enable Register 221 2 256 0 Voltage Overload ais 2 2 512 y PET ree n E 4 2 1024 STATus PRESet 1 Current Overload Sag otha soe Not Used 2 16 2 4096 Not Used 2 32 2 8192 CLS Not Used 2 64 2 16384 Not Used 2 128 2 32768 Not Used ESE lt enable value gt Not used yon lot Use ESE Status Byte f 9 Ohms Overload Summary Register
15. O um MAXimum MINimum MAXimum imum MAXimum F ON F ON F ON F ON F ON FF ON Default parameters are shown in bold 106 Chapter 4 Remote Interface Reference Command Summary Measurement Configuration Commands continued SENSe VOLTage DC RESolution lt resolution gt MINimum MAXimum VOLTage DC RESolution INimum MAXimum VOLTage AC RESolution lt resolution INimum MAXimum VOLTage AC RESolution INimum MAXimum CURRent DC RESolution lt resolution INimum MAXimum CURRent DC RESolution INimum MAXimum CURRent AC RESolution resolution MINimum MAXimum CURRent AC RESolution INimum MAXimum RESistance RESolution resolution MINimum MAXimum RESistance RESolution INimum MAXimum v v FRESistance RESolution lt resolution gt MINimum MAXimum FRESistance RESolution MINimum MAXimum SENSe VOLTage DC NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum VOLTage DC NPLCycles MINimum MAXimum CURRent DC NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum CURRent DC NPLCycles MINimum MAXimum RESistance NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum RESistance NPLCycles MINimum MAXimum RESistance NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum ay A RESistance NPLCycles MINimum MAXimum Se REQuency APERture 0 01 0 1 1 MINimum MAXimum REQuency APERture MINimum MAX
16. Reference Measurement Configuration Commands function RESolution resolution MINimum MAXimum Select the resolution for the specified function not valid for frequency period or ratio Specify the resolution in the same units as the measurement function not in number of digits MIN selects the smallest value accepted which gives the most resolution MAX selects the largest value accepted which gives the least resolution Stored in volatile memory lt function gt RESolution MINimum MAXimum Query the resolution for the selected function For frequency or period measurements the multimeter returns a resolution setting based upon a 3 Hz input frequency function NPLCycles 0 02 10 2 1 10 100 MINimum MAXimum Select the integration time in number of power line cycles for the present function the default is 10 PLC This command is valid only for de volts ratio dc current 2 wire ohms and 4 wire ohms MIN 0 02 MAX 100 Stored in volatile memory lt function gt NPLCycles MINimum MAXimum Query the integration time for the selected function FREQuency APERture 0 01 0 1 1 MINimum MAXimum Select the aperture time or gate time for frequency measurements the default is 0 1 seconds Specify 10 ms 41 digits 100 ms default 51 digits or 1 second 61 digits MIN 0 01 seconds MAX 1 second Stored in volatile memory FREQuency APERture MINimum MAXimum Query the aperture time for freq
17. ce Reference Triggering Commands Triggering Commands See also Triggering starting on page 71 in chapter 3 INITiate Change the state of the triggering system from the idle state to the wait for trigger state Measurements will begin when the specified trigger conditions are satisfied after the INITiate command is received The readings are placed in the multimeter s internal memory up to 512 readings can be stored Readings are stored in memory until you are able to retrieve them Use the FETCh command to retrieve reading results A new command is available starting with firmware Revision 2 which allows you to take readings using INITiate without storing them in internal memory This command may be useful with the min max operation since it allows you to determine the average of a series of readings without storing the individual values DATA FEED RDG STORE do not store readings DATA FEED RDG_STORE CALCulate store readings default See page 126 for more information on using the DATA FEED command READ Change the state of the trigger system from the idle state to the wait for trigger state Measurements will begin when the specified trigger conditions are satisfied following the receipt of the READ command Readings are sent immediately to the output buffer TRIGger SOURce BUS IMMediate EXTernal Select the source from which the
18. er using the FETCh command DATA FEED Query the reading memory state Returns CALC or 126 Chapter 4 Remote Interface Reference Triggering Triggering See also Triggering starting on page 71 in chapter 3 First time SCPI users The multimeter s triggering system allows you to generate triggers either manually or automatically take multiple readings per trigger and insert a delay before each reading Normally the multimeter will take one reading each time it receives a trigger but you can specify multiple readings up to 50 000 per trigger see page 154 Triggering the multimeter from the remote interface is a multi step process that offers triggering flexibility e First you must configure the multimeter for the measurement by selecting the function range resolution etc e Then you must specify the source from which the multimeter will accept the trigger The multimeter will accept a software bus trigger from the remote interface a hardware trigger from the rear panel Ext Trig external trigger terminal or an immediate internal trigger e Then you must make sure that the multimeter is ready to accept a trigger from the specified trigger source this is called the wait for trigger state The diagram on the next page shows the multimeter s triggering system 127 Chapter 4 Remote Interface Reference Triggering HP 34401A Triggering Sy
19. g measurements when the output buffer fills Readings are not stored in the multimeter s internal memory when using the READ command Sending the READ command is like sending the INITiate command followed immediately by the FETCh command except readings are not buffered internally 114 Chapter 4 Remote Interface Reference Simplified Programming Overview Caution If you send two query commands without reading the response from the first and then attempt to read the second response you may receive some data from the first response followed by the complete second response To avoid this do not send a query command without reading the response When you cannot avoid this situation send a device clear before sending the second query command Using the INITiate and FETCh Commands The INITiate and FETCh commands provide the lowest level of control with the most flexibility of measurement triggering and reading retrieval Use the INITiate command after you have configured the multimeter for the measurement This changes the state of the triggering system from the idle state to the wait for trigger state Measurements will begin when the specified trigger conditions are satisfied after the INITiate command is received The readings are placed in the multimeter s internal memory up to 512 readings can be stored Readings are stored in memory until you are able to retrieve them Use the FETC
20. gger Source TRIG SOUR Immediate Math Function CALCulate subsystem OFF 112 Chapter 4 Remote Interface Reference Simplified Programming Overview Using the MEASure Command The easiest way to program the multimeter for measurements is by using the MEASure command However this command does not offer much flexibility When you execute the command the multimeter presets the best settings for the requested configuration and immediately performs the measurement You cannot change any settings other than function range and resolution before the measurement is taken The results are sent to the output buffer Sending the MEASure command is the same as sending a CONFigure command followed immediately by a READ command Using the CONFigure Command For a little more programming flexibility use the CONFigure command When you execute the command the multimeter presets the best settings for the requested configuration like the MEASure command However the measurement is not automatically started and you can change measurement parameters before making measurements This allows you to incrementally change the multimeter s configuration from the preset conditions The multimeter offers a variety of low level commands in the INPut SENSe CALCulate and TRIGger subsystems You can use the SENSe FUNCt ion command to change the measurement function without using MEASure or CONFigure Use the IN
21. h command to transfer the readings from the multimeter s internal memory to the multimeter s output buffer where you can read them into your bus controller MEASure The following program segment shows how to use the MEASure Example command to make a measurement This example configures the multimeter for dc voltage measurements automatically places the multimeter in the wait for trigger state internally triggers the multimeter to take one reading and then sends the reading to the output buffer MEAS VOLT DC 10 0 003 bus enter statement This is the simplest way to take a reading However you do not have any flexibility with MEASure to set the trigger count sample count trigger delay etc All measurement parameters except function range and resolution are preset for you automatically see the table on page 112 115 CONFigure Example CONFigure Example Chapter 4 Remote Interface Reference Simplified Programming Overview The following program segment shows how to use the READ command with CONFigure to make an externally triggered measurement The program configures the multimeter for dc voltage measurements CONF igure does not place the multimeter in the wait for trigger state The READ command places the multimeter in the wait for trigger state takes a reading when the Ext Trig terminal is pulsed and sends the reading to the output buffer CONF VOLT DC 10 0 003
22. imum ERiod APERture 0 01 0 1 1 MINimum MAXimum ERiod APERture MINimum MAXimum U U j j to SENSe DETector BANDwidth 3 20 200 MINimum MAXimum DETector BANDwidth MINimum MAXimum SENSe ZERO AUTO OFF ONCE ON ZERO AUTO INPut IMPedance AUTO OFF ON IMPedance AUTO ROUTe TERMinals Default parameters are shown in bold 107 Chapter 4 Remote Interface Reference Command Summary Math Operation Commands see page 124 for more information CALCulate FUNCtion NULL DB DBM AVERage LIMit FUNCtion STATe OFF ON STATe CALCulate AVERage MINimum AVERage MAXimum AVERage AVERage AVERage COUNt CALCu Late NULL OFFSet value MINimum MAXimum NULL OFF Set MINimum MAXimum CALCulate DB REFerence lt value gt MINimum MAXimum DB REFerence MINimum MAXimum CALCulate DBM REFerence lt value gt MINimum MAXimum DBM REFerence MINimum MAXimum CALCulate LIMit LOWer lt value gt MINimum MAXimum LIMit LOWer MINimum MAXimum LIMit UPPer lt value gt MINimum MAXimum LIMit UPPer MINimum MAXimum DATA FEED RDG STORE CALCulate DATA FEED 108 Chapter 4 Remote Interface Reference Command Summary Triggering Commands see page 127 for more information INITiate READ TRIGger SOURce BUS IMMediate EXTernal SOURcCe TRIGger DELay lt seconds gt MI
23. initiate the measurement 119 Chapter 4 Remote Interface Reference The MEASure and CONFigure Commands CONFigure FREQuency lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and configure a frequency measurement with the specified range and resolution This command does not initiate the measurement For frequency measurements the multimeter uses one range for all inputs between 3 Hz and 300 kHz With no input signal applied frequency measurements return 0 CONFigure PERiod lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and configure a period measurement with the specified range and resolution This command does not initiate the measurement For period measurements the multimeter uses one range for all inputs between 0 33 seconds and 3 3 usec With no input signal applied period measurements return 0 CONFigure CONTinuity Preset and configure the multimeter for continuity measurements This command does not initiate the measurement The range and resolution are fixed for continuity tests 1 kQ range and 514 digits CONFigure DIODe Preset and configure the multimeter for diode measurements This command does not initiate the measurement The range and resolution are fixed for diode tests 1 Vdc range with 1 mA current source output and 514 digits CONFigure Query the multimeter s present configuration and return a quoted string 120 Chapter
24. lution MIN MAX DEF Preset and make a period measurement with the specified range and resolution The reading is sent to the output buffer For period measurements the multimeter uses one range for all inputs between 0 33 seconds and 3 3 usec With no input signal applied period measurements return 0 MEASure CONTinuity Preset and make a continuity measurement The reading is sent to the output buffer The range and resolution are fixed for continuity tests 1 KQ range and 5 4 digits MEASure DIODe Preset and make a diode measurement The reading is sent to the output buffer The range and resolution are fixed for diode tests 1 Vdc range with 1 mA current source output and 514 digits 118 Chapter 4 Remote Interface Reference The MEASure and CONFigure Commands CONFigure VOLTage DC lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and configure the multimeter for dc voltage measurements with the specified range and resolution This command does not initiate the measurement CONFigure VOLTage DC RATio lt unge gt MIN MAX DEF resolution MIN MAX DEF Preset and configure the multimeter for dc dc ratio measurements with the specified range and resolution This command does not initiate the measurement For ratio measurements the specified range applies to the signal connected to the Input terminals Autoranging is automatically selected for reference voltage measureme
25. multimeter will accept a trigger The multimeter will accept a software bus trigger an immediate internal trigger this is the default source or a hardware trigger from the rear panel Ext Trig external trigger terminal Stored in volatile memory TRIGger SOURce Query the present trigger source Returns BUS IMM or EXT 130 Chapter 4 Remote Interface Reference Triggering Commands TRIGger DELay seconds MINimum MAXimum Insert a trigger delay between the trigger signal and each sample that follows If you do not specify a trigger delay the multimeter automatically selects a delay for you Select from 0 to 3600 seconds MIN 0 seconds MAX 3600 seconds Stored in volatile memory TRIGger DELay MINimum MAXimum Query the trigger delay TRIGger DELay AUTO OFF ON Disable or enable an automatic trigger delay The delay is determined by function range integration time and ac filter setting Selecting a specific trigger delay value automatically turns off the automatic trigger delay Stored in volatile memory TRIGger DELay AUTO Query the automatic trigger delay setting Returns 0 OFF or 1 ON SAMPle COUNt lt value gt MINimum MAXimum Set the number of readings samples the multimeter takes per trigger Select from 1 to 50 000 readings per trigger MIN 1 MAX 50 000 Stored in volatile memory SAMPle COUNt MINimum MAXimum Query the sample count
26. n MAX selects the highest range DEF selects autoranging e For the resolution parameter specify the resolution in the same units as the measurement function not in number of digits MIN selects the smallest value accepted which gives the best resolution MAX selects the largest value accepted which gives the least resolution DEF selects the default resolution which is 5 digits slow 10 PLC Note You must specify a range to use the resolution parameter MEASure VOLTage DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and make a dc voltage measurement with the specified range and resolution The reading is sent to the output buffer MEASure VOLTage DC RATio lt unge gt MIN MAX DEF resolution MIN MAX DEF Preset and make a de dc ratio measurement with the specified range and resolution The reading is sent to the output buffer For ratio measurements the specified range applies to the signal connected to the Input terminals Autoranging is automatically selected for reference voltage measurements on the Sense terminals MEASure VOLTage AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and make an ac voltage measurement with the specified range and resolution The reading is sent to the output buffer For ac measurements resolution is actually fixed at 6 digits The resolution parameter only affects the front panel display MEASure CURRent DC
27. nts on the Sense terminals CONFigure VOLTage AC lt range gt MIN MAX DEF resolution MIN MAX DEF Preset and configure the multimeter for ac voltage measurements with the specified range and resolution This command does not initiate the measurement For ac measurements resolution is actually fixed at 614 digits The resolution parameter only affects the front panel display CONFigure CURRent DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and configure the multimeter for dc current measurements with the specified range and resolution This command does not initiate the measurement CONFigure CURRent AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and configure the multimeter for ac current measurements with the specified range and resolution This command does not initiate the measurement For ac measurements resolution is actually fixed at 614 digits The resolution parameter only affects the front panel display CONFigure RESistance lt runge gt MIN MAX DEF resolution MIN MAX DEF Preset and configure the multimeter for 2 wire ohms measurements with the specified range and resolution This command does not initiate the measurement CONFigure FRESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Preset and configure the multimeter for 4 wire ohms measurements with the specified range and resolution This command does not
28. on on page 168 e IEEE 488 Compliance Information on page 169 If you are a first time user of the SCPI language you may want to refer to these sections to become familiar with the language before attempting to program the multimeter 104 Chapter 4 Remote Interface Reference Command Summary Command Summary This section summarizes the SCPI Standard Commands for Programmable Instruments commands available to program the multimeter Refer to the later sections in this chapter for more complete details on each command Throughout this manual the following conventions are used for SCPI command syntax Square brackets l indicate optional keywords or parameters Braces enclose parameters within a command string Triangle brackets lt gt indicate that you must substitute a value for the enclosed parameter The MEASure and CONFigure Commands see page 117 for more information First time SCPI users see page 154 EASure VOLTage DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF VOLTage DC RATio lt range gt MIN MAX DEF lt resolution gt IN MAX DEF VOLTage AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent DC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF RESistance lt range gt MIN MAX DEF lt resolution gt
29. ront panel The multimeter will display up to 12 characters in a message any additional characters are truncated Stored in volatile memory DISPlay TEXT Query the message sent to the front panel and return a quoted string DISPlay TEXT CLEar Clear the message displayed on the front panel 132 Chapter 4 Remote Interface Reference System Related Commands SYSTem BEEPer Issue a single beep immediately SYSTem BEEPer STATe OFF ON Disable or enable the front panel beeper Stored in non volatile memory When you disable the beeper the multimeter will not emit a tone when 1 anew minimum or maximum is found in a min max test 2 a stable reading is captured in reading hold 3 a limit is exceeded in a limit test 4 a forward biased diode is measured in the diode test function SYSTem BEEPer STATe Query the state of the front panel beeper Returns 0 OFF or 1 ON SYSTem ERRor Query the multimeter s error queue Up to 20 errors can be stored in the queue Errors are retrieved in first in first out FIFO order Each error string may contain up to 80 characters SYSTem VERSion Query the multimeter to determine the present SCPI version DATA POINts Query the number of readings stored in the multimeter s internal memory RST Reset the multimeter to its power on configuration TST Perform a complete self test of the multimeter Returns 0 if the self test is successf
30. s you must turn on the math operation before writing to their math registers DCV ACV DCI ACI a2W Q 4W Freq Per Cont Diode Ratio Null X X X X X X X X Min Max X X X X X x X X X dB X X dBm X Xx Limit X X X X X X X X X CALCulate FUNCtion NULL DB DBM AVERage LIMit Select the math function Only one function can be enabled at a time The default function is null Stored in volatile memory CALCulate FUNCtion Query the present math function Returns NULL DB DBM AVER or LIM CALCulate STATe OFF ON Disable or enable the selected math function Stored in volatile memory CALCulate STATe Query the state of the math function Returns 0 OFF or 1 ON 124 Chapter 4 Remote Interface Reference Math Operation Commands CALCulate AVERage MINimum Read the minimum value found during a min max operation The multimeter clears the value when min max is turned on when power has been off or after a remote interface reset Stored in volatile memory CALCulate AVERage MAXimum Read the maximum value found during a min max operation The multimeter clears the value when min max is turned on when power has been off or after a remote interface reset Stored in volatile memory CALCulate AVERage AVERage Read the average of all readings taken since min max was enabled The multimeter clears the value when min max is turned on when power has been off or after a remote interface reset
31. stem Initiate Triggering MEASure READ INITiate Ss Wait for Trigger State Trigger Source TRIGger SOURce IMMediate TRIGger SOURce EXTernal TRIGger SOURce BUS Front panel Single key Trigger Delay TRIGger DELay Sample Annunciator Measurement Sample Sample Count 1 Trigger Count 1 128 Chapter 4 Remote Interface Reference Triggering The Wait for Trigger State After you have configured the multimeter and selected a trigger source you must place the multimeter in the wait for trigger state A trigger will not be accepted until the multimeter is in this state If a trigger signal is present and if multimeter is in the wait for trigger state the measurement sequence begins and readings are taken The wait for trigger state is a term used primarily for remote interface operation From the front panel the multimeter is always in the wait for trigger state and will accept triggers at any time unless a measurement is already in progress You can place the multimeter in wait for trigger state by executing any of the following commands from the remote interface MEASure READ INITiate The multimeter requires approximately 20 ms of set up time after you send a command to change to the wait for trigger state Any external triggers that occur during this set up time are ignored 129 Chapter 4 Remote Interfa
32. uency measurements PERiod APERture 0 01 0 1 1 MINimum MAXimum Select the aperture time or gate time for period measurements the default is 0 1 seconds Specify 10 ms 4 digits 100 ms default 514 digits or 1 second 6 4 digits MIN 0 01 seconds MAX 1 second Stored in volatile memory PERiod APERture MINimum MAXimum Query the aperture time for period measurements 122 Chapter 4 Remote Interface Reference Measurement Configuration Commands SENSe DETector BANDwidth 3 20 200 MINimum MAXimum Specify the lowest frequency expected in the input signal The multimeter selects the slow medium default or fast ac filter based on the frequency you specify MIN 3 Hz MAX 200 Hz Stored in volatile memory SENSe DETector BANDwidth MINimum MAXimum Query the ac filter Returns 3 20 or 200 SENSe ZERO AUTO OFF ONCE ON Disable or enable default the autozero mode The OFF and ONCE parameters have a similar effect Autozero OFF does not issue a new zero measurement until the next time the multimeter goes to the wait for trigger state Autozero ONCE issues an immediate zero measurement Stored in volatile memory SENSe ZERO AUTO Query the autozero mode Returns 0 OFF or ONCE or 1 ON INPut IMPedance AUTO OFF ON Disable or enable the automatic input resistance mode for dc voltage measurements With AUTO OFF default the input resistance is
33. ul or 1 if it test fails IDN Read the multimeter s identification string be sure to dimension a string variable with at least 35 characters 133

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