Keysight U2741A Programmer's Reference Manual
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Keysight U2741A Programmer's Reference Manual

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Summary of Contents for Keysight U2741A

  • Page 1 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide...
  • Page 2 DFARS and are set forth Declaration of Conformity. specifically in writing elsewhere in the WARNING EULA. Keysight shall be under no obligation to update, revise or A WARNING notice denotes a hazard. It otherwise modify the Software. With...

  • Page 3: Table Of Contents

    ........42 Keysight U2741A Programmer’s Reference Guide...
  • Page 4 ......87 [SENSe:]FREQuency:APERture ....... 88 Keysight U2741A Programmer’s Reference Guide...
  • Page 5 ......... .129 Keysight U2741A Programmer’s Reference Guide...
  • Page 6 ........163 Keysight U2741A Programmer’s Reference Guide...
  • Page 7 ........164 13 Factory Default Settings Keysight U2741A Programmer’s Reference Guide...
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  • Page 9 List of Figures Figure 2-1 Status system diagram ......20 Keysight U2741A Programmer’s Reference Guide...
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  • Page 11 ......163 Table 12-6 Calibration Errors ......164 Keysight U2741A Programmer’s Reference Guide...
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  • Page 13 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide Introduction to Programming Introduction to the SCPI Language SCPI Conventions and Data Formats This chapter introduces the remote programming basics of the U2741A device. The programming commands provide the means of remote control.

  • Page 14: Introduction To Programming

    [<range|MIN|MAX|AUTO>[,<resolution|MIN|MAX|DEF>]] CONFigure is the root keyword of the command, VOLTage and CURRent are second-level keywords, and DC and AC are third-level keywords. A colon ( : ) separates a command keyword from a lower-level keyword. Keysight U2741A Programmer’s Reference Guide...

  • Page 15: Scpi Conventions And Data Formats

    Braces indicate parameters that may be repeated zero or more times. It is used especially for showing arrays. The notation <A>{,<B>} shows that parameter must be entered, while parameter may be omitted, or “ ” “ ” may be entered one or more times. Keysight U2741A Programmer’s Reference Guide...
  • Page 16 Parameters that represent a single binary condition that is either true or false. For a false condition, the U2741A will accept OFF or 0. For a true condition, the U2741A will accept ON or 1. When you query a boolean setting, the U2741A will always return 0 or 1.

  • Page 17: Command Separators

    You can query the current value of most parameters by adding a question mark ( ? ) to the command. For example, the following command sets the DC voltage range to 1: SENS:VOLT:DC:RANG 1 You can then query the voltage range setting by sending: SENS:VOLT:DC:RANG? Keysight U2741A Programmer’s Reference Guide...

  • Page 18: Scpi Command Terminators

    Introduction to Programming SCPI Command Terminators A command string sent to the U2741A must terminate with a <new line> (<NL>) character. The IEEE-488 End-Of-Identify (EOI) message is interpreted as a <NL> character and can be used to terminate a command string in place of a <NL>...

  • Page 19: 2 Scpi Status Registers

    Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide SCPI Status Registers SCPI Status Registers This chapter explains the SCPI status registers that record various instrument conditions of the U2741A.

  • Page 20: Scpi Status Registers

    SCPI Status Registers SCPI Status Registers The U2741A uses the Status Byte register group and Standard Event register group to record various instrument conditions. The figure below shows the relationship between various registers in the U2741A SCPI status system. Figure 2-1 Status system diagram Keysight U2741A Programmer’s Reference Guide...

  • Page 21: Status Byte Register

    Status Byte Register The Status Byte summary register reports conditions from the other status registers. Query data that is waiting in the U2741A output buffer is immediately reported through message available bit (bit 4). Bits in the summary register are not latched.

  • Page 22: Standard Event Register

    Always zero 2 Query Error The U2741A tried to read the output buffer but it was empty. Or, a new command line was received before a previous query has been read. Or, both the input and output buffers are full.
  • Page 23 SCPI Status Registers The Standard Event Enable register is cleared when you execute the *ESE 0 command. Please refer to Chapter 11 for more details on the common IEEE commands NOTE mentioned above. Keysight U2741A Programmer’s Reference Guide...

  • Page 24: Questionable Data Register

    Questionable Data Register The Questionable Data register group provides the information on the quality or integrity of the U2741A. The outputs of the Questionable Data group are logically-ORed into the Questionable summary bit (3) of the Status Byte register. Bit number...

  • Page 25: Standard Operation Register

    Standard Operation Register The Standard Operation register group provides the information for the operation of the U2741A. The outputs of the Standard Operation group are logically-ORed into the Standard Operation summary bit (7) of the Status Byte register. Bit number...
  • Page 26 SCPI Status Registers THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 27 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide CALibrate Subsystem CALibration:ADC? CALibration[:ALL]? CALibration:COUNt? CALibration:SECure:CODE CALibration:SECure:STATe CALibration:STORe CALibration:STRing CALibration:VALue This chapter explains the CALibrate commands that allow users to perform external calibration for the U2741A.

  • Page 28: Calibrate Subsystem

    Remarks It will return a +0 if the calibration passes and +1 if it fails. Refer to the Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide for detailed procedures, including how to connect to a calibration source, recommended equipments, the specified calibration points, and so forth.

  • Page 29: Calibration[:All]

    U2741A, you must unsecure it by entering the correct security code. Remarks It will return a 0 if the calibration passes and +1 if it fails. Refer to the Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide for detailed procedures, including how to connect to a calibration source, recommended equipments, the specified calibration points, and so forth.

  • Page 30: Calibration:count

    Ensure that your U2741A has been calibrated before it leaves the factory. When NOTE you receive your U2741A, be sure to read the count to determine the initial values. For a more detailed discussion of the calibration procedures, see the Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide.

  • Page 31: Calibration:secure:code

    CALibrate Subsystem CALibration:SECure:CODE Syntax CALibration:SECure:CODE <new_code> This command sets the new security code. To change the security code, you must first unsecure the U2741A using the old security code, and then enter a new code. Parameter Item Type Range of values...

  • Page 32: Calibration:secure:state

    11 characters can be letters, numbers (0 to 9), or the underscore character (“_”). Blank spaces are not allowed. Remarks – The security code is set to ATU2741A and is secured when the U2741A is shipped from the factory. – Unsecuring the U2741A using this command enables the U2741A to be calibrated.
  • Page 33 CALibrate Subsystem Example //Sets the secured state to ON CAL:SEC:STAT ON,ABCDEFG //Queries the secured state CAL:SEC:STAT? Typical Response: 1 See Also CALibration:SECure:CODE Keysight U2741A Programmer’s Reference Guide...

  • Page 34: Calibration:store

    Syntax CALibration:STORe This command stores the calibration results of the known calibration signal used by the calibration procedures as outlined in the Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide. The results is stored in a nonvolatile memory.

  • Page 35: Calibration:string

    CALibrate Subsystem CALibration:STRing Syntax CALibration:STRing <string> This command can be used to record the U2741A calibration information. For example, you store such information as the last calibration date, the next calibration due date, the U2741A serial number and so forth. CALibration:STRing? This command queries the calibration message.

  • Page 36: Calibration:value

    Syntax CALibration:VALue <value> This command specifies the value of the known calibration signal used by the calibration procedures as outlined in the Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide. CALibration:VALue? This command queries the present calibration value.
  • Page 37 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide CONFigure Subsystem CONFigure? CONFigure:CONTinuity CONFigure:CURRent:AC CONFigure:CURRent[:DC] CONFigure:DIODe CONFigure:FREQuency CONFigure:FRESistance CONFigure:RESistance CONFigure:SSI CONFigure:TEMPerature CONFigure[:VOLTage]:AC CONFigure[:VOLTage][:DC] This chapter explains the CONFigure subsystem.

  • Page 38: Configure Subsystem

    CONFigure Subsystem CONFigure? Syntax CONFigure? This command queries the present U2741A configuration and response returned in quoted string. Remarks The *RST command will set all measurement parameters to their factory settings, clear reading memory, and clear all stored statistical data.

  • Page 39: Configure:continuity

    This command presets and configures the U2741A for continuity measurements. This command does not initiate the measurement. Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state.

  • Page 40: Configure:current:ac

    Numeric Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 41 CONFigure Subsystem Examples //Configures the U2741A to measure AC CONF:CURR:AC 2 current at 2 A range //Triggers a measurement and read READ? Typical Response: +1.86850E+00 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...

  • Page 42: Configure:current[:Dc]

    1.50e–6 5.00e–6, 2.00e–6, 1.50e–6 Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 43 CONFigure Subsystem Examples //Configures the U2741A to measure DC CONF:CURR 2, 0.00001 current at 2 A range and 10 μA resolution //Triggers a measurement and read READ? Typical Response: +1.86850E+00 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...

  • Page 44: Configure:diode

    This command presets and configures the U2741A for diode measurements. This command does not initiate the measurement. Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state.

  • Page 45: Configure:frequency

    Numeric Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – Frequency is measured on AC voltage signals. Thus, the proper AC voltage should be first set using the [SENS:]VOLT:AC:RANG command.
  • Page 46 CONFigure Subsystem Example //Configures the U2741A to measure CONF:FREQ 1 frequency of 1 Hz //Triggers a measurement and read READ? Typical Response: +1.00000E+00 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...

  • Page 47: Configure:fresistance

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 48 CONFigure Subsystem Examples //Configures the U2741A to measure CONF:FRES 1e3, 0.00001 resistance at 1 kΩ range and 10 μOhm resolution using four-wire measurement method //Triggers a measurement and read READ? Typical Response: +1.86850E+02 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ?

  • Page 49: Configure:resistance

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 50 CONFigure Subsystem Examples //Configures the U2741A to measure CONF:RES 1e3, 0.00001 resistance at 1 kΩ range and 10 μOhm resolution //Triggers a measurement and read READ? Typical Response: +1.86850E+02 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...

  • Page 51: Configure:ssi

    NOTE – If the SSI configuration is set to NONE, then the address list need not be specified. – For more information on the SSI, refer to the Keysight U2781A USB Modular Instrument Chassis User’s Guide. Examples The following example sets one unit of the U2761A to master and two units of the U2741A to slaves.
  • Page 52 For Unit 2: CONF:SSI SLAV, (@0) For Unit 3: CONF:SSI SLAV, (@1) The following queries return the string values. For Unit 1: CONF:SSI? Typical Response: MAST,0,1 For Unit 2: CONF:SSI? Typical Response: SLAV,0 For Unit 3: CONF:SSI? Typical Response: SLAV,1 Keysight U2741A Programmer’s Reference Guide...

  • Page 53: Configure:temperature

    THER|DEFault THER Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – For temperature measurements, the U2741A internally selects the range. You cannot select the range to be used.

  • Page 54: Configure[:Voltage]:Ac

    Numeric Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 55 CONFigure Subsystem Examples //Configures the U2741A to measure AC CONF:AC 1 voltage at 1 V range //Triggers a measurement and read READ? Typical Response: +1.86850E-01 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...

  • Page 56: Configure[:Voltage][:Dc]

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – The CONF command does not place the U2741A in the “wait-for-trigger” state. Use the INIT or READ? command in conjunction with CONF to place the U2741A in the “wait-for-trigger” state. – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range.
  • Page 57 CONFigure Subsystem Examples //Configures the U2741A to measure DC CONF 1, 0.00001 voltage at 1 V range and 10 μV resolution //Triggers a measurement and read READ? Typical Response: +1.86850E-01 See Also CONFigure? MEASure[:VOLTage][:DC]? FETCh? INITiate[:IMMediate] READ? Keysight U2741A Programmer’s Reference Guide...
  • Page 58 CONFigure Subsystem THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 59 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide MEASure Subsystem MEASure:CONTinuity? MEASure:CURRent:AC? MEASure:CURRent[:DC]? MEASure:DIODe? MEASure:FREQuency? MEASure:FRESistance? MEASure:RESistance? MEASure:TEMPerature? MEASure[:VOLTage]:AC? MEASure[:VOLTage][:DC]? This chapter explains how the MEASure command subsystem is configured when acquiring data from the U2741A.

  • Page 60: Measure Subsystem

    This command presets, configures the U2741A for continuity measurements and make a measurement. Continuity is a special type of fixed-range two-wire resistance measurement. The reading is sent to the U2741A output buffer. Remarks – The range is fixed at 1 kΩ (a two-wire resistance measurement) and the resolution is fixed at 4.5 digits.

  • Page 61: Measure:current:ac

    Numeric Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal. For faster measurements, use manual range on each measurement as additional time is required for autorange since the U2741A has to make a range selection.
  • Page 62 MEASure Subsystem Example //Configures the U2741A to measure AC MEAS:CURR:AC? 2 current at 2 A range and triggers a measurement Typical Response: +1.86850E+00 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...

  • Page 63: Measure:current[:Dc]

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal.
  • Page 64 MEASure Subsystem Example //Configures the U2741A to measure DC MEAS:CURR? 2 current at 2 A range and triggers a measurement Typical Response: +1.86850E+00 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...

  • Page 65: Measure:diode

    MEASure Subsystem MEASure:DIODe? Syntax MEASure:DIODe? This command presets, configures the U2741A for diode measurements, and make a measurement. The reading is sent to the output buffer. Remarks – The range and resolution are fixed for diode test with the range at 1 VDC with a 1 mA constant current source output and the resolution is fixed at 4.5 digits.

  • Page 66: Measure:frequency

    – If the input signal voltage is greater than can be measured on the selected voltage range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. Autorange can be enabled for the input voltage.
  • Page 67 MEASure Subsystem Example //Configures the U2741A to measure MEAS:FREQ? 1 frequency of 1 Hz and triggers a measurement Typical Response: +1.00000E+00 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...

  • Page 68: Measure:fresistance

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal.
  • Page 69 MEASure Subsystem Example //Configures the U2741A to measure MEAS:FRES? 1e3, 0.00001 resistance at 1 kΩ range and 10 μOhm resolution using four-wire measurement method and triggers a measurement Typical Response: +1.86850E+02 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...

  • Page 70: Measure:resistance

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal.
  • Page 71 MEASure Subsystem Example //Configures the U2741A to measure MEAS:RES? 1e3, 0.00001 resistance at 1 kΩ range and 10 μΩ resolution using two-wire measurement method and triggers a measurement Typical Response: +1.86850E+02 See Also CONFigure Subsystem CONFigure:RESistance Keysight U2741A Programmer’s Reference Guide...

  • Page 72: Measure:temperature

    – For temperature measurements, the resolution is fixed at 3.5 digits. – To change the temperature units, use the UNIT:TEMP command. – For the thermistor measurements, U2741A autoranges to the correct range for the transducer resistance measurement. – If the TRIG:SOUR is set to BUS, the MEAS? command overwrites the BUS trigger and returns a measurement.

  • Page 73: Measure[:Voltage]:Ac

    Numeric Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal. For faster measurements, use manual range on each measurement as additional time is required for autorange since the U2741A has to make a range selection.
  • Page 74 MEASure Subsystem Example //Configures the U2741A to measure AC MEAS:AC? 1 voltage at 1 V range and triggers a measurement Typical Response: +1.86850E-01 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...

  • Page 75: Measure[:Voltage][:Dc]

    3.00e–5, 2.00e–5, 1.00e–5, 5.00e–6, 2.00e–6, 1.50e–6 1.50e–6 Remarks – You can allow the U2741A to automatically select the measurement range using autorange or you can select a fixed range using manual range. Autorange is convenient because the U2741A decides which range to use for each measurement based on the input signal.
  • Page 76 MEASure Subsystem Example //Configures the U2741A to measure DC MEAS? 1, 0.0001 voltage at 1 V range and 100 μV resolution and triggers a measurement Typical Response: +1.86850E-01 See Also CONFigure Subsystem Keysight U2741A Programmer’s Reference Guide...
  • Page 77 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide SENSe Subsystem [SENSe:]FUNCtion [SENSe:]CURRent:AC:RANGe [SENSe:]CURRent:AC:RANGe:AUTO [SENSe:]CURRent[:DC]:NPLC [SENSe:]CURRent[:DC]:RANGe [SENSe:]CURRent[:DC]:RANGe:AUTO [SENSe:]CURRent[:DC]:RESolution [SENSe:]CURRent[:DC]:ZERO:AUTO [SENSe:]FREQuency:APERture [SENSe:]FRESistance:NPLC [SENSe:]FRESistance:RANGe [SENSe:]FRESistance:RANGe:AUTO [SENSe:]FRESistance:RESolution [SENSe:]RESistance:NPLC [SENSe:]RESistance:RANGe [SENSe:]RESistance:RANGe:AUTO [SENSe:]RESistance:RESolution [SENSe:]RESistance:ZERO:AUTO [SENSe:]TEMPerature:RJUNction? [SENSe:]TEMPerature:ZERO:AUTO [SENSe:]VOLTage:AC:RANGe [SENSe:]VOLTage:AC:RANGe:AUTO [SENSe:]VOLTage[:DC]:NPLC [SENSe:]VOLTage[:DC]:RANGe [SENSe:]VOLTage[:DC]:RANGe:AUTO [SENSe:]VOLTage[:DC]:RESolution [SENSe:]VOLTage[:DC]:ZERO:AUTO...

  • Page 78: Sense Subsystem

    – This command has no default value. However, the U2741A defaults to DC volts after a factory reset (*RST command). – Autorange will be turned off after [SENS:]FUNC has been set.

  • Page 79: [Sense:]Current:ac:range

    – If the input signal is greater than can be measured on the selected range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. – The U2741A is set to 1 A, with autorange enabled, after a factory reset (*RST command) Examples...

  • Page 80: [Sense:]Current:ac:range:auto

    – Autorange thresholds: Lower range at: <10% of range Upper range at: >120% of range – With autorange enabled, the U2741A selects the appropriate range based on the input signal detected. – Selecting a discrete range (see command) will [SENSe:]CURRent:AC:RANGe disable autorange.
  • Page 81 SENSe Subsystem Examples //Sets autorange for AC current CURR:RANG:AC:AUTO ON measurement to ON //Queries the autorange mode CURR:RANG:AC:AUTO? Typical Response: 1 See Also CONFigure:CURRent:AC [SENSe:]CURRent:AC:RANGe Keysight U2741A Programmer’s Reference Guide...

  • Page 82: [Sense:]Current[:Dc]:Nplc

    – Only those integration times set to an integral number of power line cycles (1, 2, 10, or 20 PLCs) provides a normal mode (line frequency noise) rejection. – The U2741A sets the integration time to 20 PLCs after a factory reset (*RST command) or an Instrument Preset (SYST:PRES command).

  • Page 83: [Sense:]Current[:Dc]:Range

    – If the input signal is greater than can be measured on the selected range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. – The U2741A is set to 1 A, with autorange enabled, after a factory reset (*RST command) Examples...

  • Page 84: [Sense:]Current[:Dc]:Range:auto

    – Autorange thresholds: Lower range at: <10% of range Upper range at: >120% of range – With autorange enabled, the U2741A selects the appropriate range based on the input signal detected. – Selecting a fixed range (see command) will [SENSe:]CURRent:AC:RANGe disable autorange.
  • Page 85 SENSe Subsystem Examples //Sets autorange for DC current CURR:RANG:AUTO ON measurement to ON //Queries the autorange mode CURR:RANG:AUTO? Typical Response: 1 See Also CONFigure:CURRent[:DC] [SENSe:]CURRent:AC:RANGe Keysight U2741A Programmer’s Reference Guide...

  • Page 86: [Sense:]Current[:Dc]:Resolution

    MIN selects the smallest value accepted, which gives the highest resolution; MAX selects the largest value accepted, which gives the least resolution. – The U2741A sets the resolution to 5.5 digits after a factory reset (*RST command). Examples //Sets the measurement resolution to CURR:RES 0.00003...

  • Page 87: [Sense:]Current[:Dc]:Zero:auto

    This prevents offset currents present on the U2741A input circuitry from affecting measurement accuracy. – When autozero is OFF, the U2741A uses the last measured zero reading and subtracts it from each measurement. It takes a new zero reading each time you change the function, range, or integration time.

  • Page 88: [Sense:]Frequency:aperture

    Item Type Range of values Defaul t value value Numeric {0.1 s|1 s} Examples //Sets the U2741A to measure frequency FREQ:APER 0.1 at 0.1 s aperture setting //Queries the aperture FREQ:APER? Typical Response: +1.00000E-01 See Also CONFigure:FREQuency Keysight U2741A Programmer’s Reference Guide...

  • Page 89: [Sense:]Fresistance:nplc

    – Only those integration times set to an integral number of power line cycles (1, 2, 10, or 20 PLCs) provides a normal mode (line frequency noise) rejection. – The U2741A sets the integration time to 20 PLCs after a factory reset (*RST command) or an Instrument Preset (SYST:PRES command).

  • Page 90: [Sense:]Fresistance:range

    – If the input signal is greater than can be measured on the selected range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. – The U2741A is set to 1 kΩ, with autorange enabled, after a factory reset (*RST command). Examples...

  • Page 91: [Sense:]Fresistance:range:auto

    – Autorange thresholds: Lower range at: <10% of range Upper range at: >120% of range – With autorange enabled, the U2741A selects the appropriate range based on the input signal detected. – Selecting a fixed range (see command) will [SENSe:]FRESistance:NPLC disable autorange.
  • Page 92 SENSe Subsystem Examples //Sets autorange for resistance FRES:RANG:AUTO ON measurement to ON //Queries the autorange mode FRES:RANG:AUTO? Typical Response: 1 See Also CONFigure:RESistance [SENSe:]FRESistance:NPLC Keysight U2741A Programmer’s Reference Guide...

  • Page 93: [Sense:]Fresistance:resolution

    MIN selects the smallest value accepted, which gives the highest resolution; MAX selects the largest value accepted, which gives the least resolution. – The U2741A sets the resolution to 5.5 digits after a factory reset (*RST command). Examples...

  • Page 94: [Sense:]Resistance:nplc

    – Only those integration times set to an integral number of power line cycles (1, 2, 10, or 20 PLCs) provides a normal mode (line frequency noise) rejection. – The U2741A sets the integration time to 20 PLCs after a factory reset (*RST command) or an Instrument Preset (SYST:PRES command).

  • Page 95: [Sense:]Resistance:range

    – If the input signal is greater than can be measured on the selected range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. – The U2741A is set to 1 kΩ, with autorange enabled, after a factory reset (*RST command) Examples...

  • Page 96: [Sense:]Resistance:range:auto

    Syntax [SENSe:]RESistance:RANGe:AUTO <state> This command disables or enables autorange for resistance measurements. Autorange is convenient because the U2741A automatically selects the range for each measurement based on the input signal detected. [SENSe:]RESistance:RANGe:AUTO? This command queries the autorange mode for resistance measurements.

  • Page 97: [Sense:]Resistance:resolution

    MIN selects the smallest value accepted, which gives the highest resolution; MAX selects the largest value accepted, which gives the least resolution. – The U2741A sets the resolution to 5.5 digits after a factory reset (*RST command). Examples...

  • Page 98: [Sense:]Resistance:zero:auto

    This removes offset variations present on the U2741A input circuitry from affecting measurement accuracy. – When autozero is OFF, the U2741A uses the last measured zero reading and subtracts it from each measurement. It takes a new zero reading each time you change the function, range, or integration time.
  • Page 99 The following command disables autozero. With autozero disabled, a new zero measurement is not issued until the next configuration change (function, range, or NPLC). RES:ZERO:AUTO OFF The following query returns the autozero setting. RES:ZERO:AUTO? Typical Response: 0 See Also CONFigure:RESistance Keysight U2741A Programmer’s Reference Guide...

  • Page 100: [Sense:]Temperature:rjunction

    This command queries the internal reference junction temperature. It will return the reference temperature in °C regardless of the selected temperature unit. Example //Queries the internal reference junction TEMP:RJUN? temperature Typical Response: +2.89753E+01 See Also UNIT:TEMPerature Keysight U2741A Programmer’s Reference Guide...

  • Page 101: [Sense:]Temperature:zero:auto

    This prevents offset voltages present on the U2741A input circuitry from affecting measurement accuracy. – When autozero is OFF, the U2741A uses the last measured zero reading and subtracts it from each measurement. It takes a new zero reading each time you change the function, range, or integration time.
  • Page 102 SENSe Subsystem Examples //Sets autozero for temperature TEMP:ZERO:AUTO ON measurements to ON //Queries the autorange mode for TEMP:ZERO:AUTO? temperature measurements Typical Response: 1 See Also CONFigure:TEMPerature Keysight U2741A Programmer’s Reference Guide...

  • Page 103: [Sense:]Voltage:ac:range

    MIN = 100 mV MAX = 1 kV Remarks – Selecting a discrete range will disable autorange. – The U2741A is set to 10 V, with autorange enabled, after a factory reset (*RST command) Examples //Configures the U2741A to measure AC...

  • Page 104: [Sense:]Voltage:ac:range:auto

    – Autorange thresholds: Lower range at: <10% of range Upper range at: >120% of range – With autorange enabled, the U2741A selects the appropriate range based on the input signal detected. – Selecting a discrete range (see command) will [SENSe:]VOLTage:AC:RANGe disable autorange.
  • Page 105 SENSe Subsystem Examples //Sets autorange for AC voltage VOLT:RANG:AC:AUTO ON measurement to ON //Queries the autorange mode VOLT:RANG:AC:AUTO? Typical Response: 1 See Also CONFigure[:VOLTage]:AC [SENSe:]VOLTage:AC:RANGe Keysight U2741A Programmer’s Reference Guide...

  • Page 106: [Sense:]Voltage[:Dc]:Nplc

    MIN = 0 PLC MAX = 20 PLC Remarks – Selecting a fixed range will disable autorange. – The U2741A is set to 20 PLCs, with autorange enabled, after a factory reset (*RST command) Examples //Configures the NPLC of the...

  • Page 107: [Sense:]Voltage[:Dc]:Range

    – If the input signal is greater than can be measured on the selected range (manual range), the U2741A gives an overload indication of +9.9E+37 from the remote interface. – The U2741A is set to 10 V, with autorange enabled, after a factory reset (*RST command) Examples...

  • Page 108: [Sense:]Voltage[:Dc]:Range:auto

    – Autorange thresholds: Lower range at: <10% of range Upper range at: >120% of range – With autorange enabled, the U2741A selects the appropriate range based on the input signal detected. – Selecting a fixed range (see command) will [SENSe:]VOLTage[:DC]:NPLC disable autorange.
  • Page 109 SENSe Subsystem Examples //Sets autorange for DC voltage to ON VOLT:RANG:AUTO 1 //Queries the autorange mode VOLT:RANG:AUTO? Typical Response: 1 See Also CONFigure[:VOLTage][:DC] [SENSe:]VOLTage[:DC]:NPLC Keysight U2741A Programmer’s Reference Guide...

  • Page 110: [Sense:]Voltage[:Dc]:Resolution

    MIN selects the smallest value accepted, which gives the highest resolution; MAX selects the largest value accepted, which gives the least resolution. – The U2741A sets the resolution to 5.5 digits after a factory reset (*RST command). Examples //Sets the measurement resolution VOLT:DC:RES 0.00003...

  • Page 111: [Sense:]Voltage[:Dc]:Zero:auto

    This prevents offset voltages present on the U2741A input circuitry from affecting measurement accuracy. – When autozero is OFF, the U2741A uses the last measured zero reading and subtracts it from each measurement. It takes a new zero reading each time you change the function, range, or integration time.
  • Page 112 SENSe Subsystem THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 113 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide STATus Subsystem STATus:OPERation:CONDition? STATus:OPERation:ENABle STATus:OPERation[:EVENt]? STATus:PRESet STATus:QUEStionable:CONDition? STATus:QUEStionable:ENABle STATus:QUEStionable[:EVENt]? This chapter explains how the STATus command subsystem functions.

  • Page 114: Status Subsystem

    U2741A is performing a calibration 1 to 3 Not Used Not Used 0 is returned Measuring U2741A is initiated, and is making, or about to make a measurement Waiting for Trigger U2741A is waiting for a trigger 6 to 7 Not Used...
  • Page 115 STATus Subsystem Example //Reads the condition register STAT:OPER:COND? (bit 5 is set) Typical Response: +32 See Also STATus:QUEStionable:ENABle STATus:QUEStionable[:EVENt]? Keysight U2741A Programmer’s Reference Guide...

  • Page 116: Status:operation:enable

    This command enables bits in the enable register for the Standard Operation Register group. The selected bits are then reported to the Status Byte. STATus:OPERation:ENABle? This command queries the Questionable Data enable register. The U2741A returns a binary-weighted decimal representing the bits set in the enable register. Parameter...
  • Page 117 U2741A is performing a calibration 1 to 3 Not Used Not Used 0 is returned Measuring U2741A is initiated, and is making, or about to make a measurement Waiting for Trigger U2741A is waiting for a trigger 6 to 7 Not Used...

  • Page 118: Status:operation[:Event]

    U2741A is performing a calibration 1 to 3 Not Used Not Used 0 is returned Measuring U2741A is initiated, and is making, or about to make a measurement Waiting for Trigger U2741A is waiting for a trigger 6 to 7 Not Used...
  • Page 119 STATus Subsystem Example //Reads the event register STAT:OPER? Typical Response: +32 See Also STATus:OPERation:ENABle STATus:OPERation:CONDition? Keysight U2741A Programmer’s Reference Guide...

  • Page 120: Status:preset

    This command clears all the bits in the Questionable Data enable register and the Standard Operation enable register. For more information on the SCPI Status System, see Chapter NOTE Example //The following command clears all the STAT:PRES enable register bits. Keysight U2741A Programmer’s Reference Guide...

  • Page 121: Status:questionable:condition

    This query returns the value of the Questionable Data condition register. The condition register is a read-only register, which holds the live (unlatched) questionable status of the U2741A. Reading the Questionable condition register does not clear it. This query returns the binary-weighted sum of all bits set in the register.

  • Page 122: Status:questionable:enable

    The following command enables bit 4 (decimal value = 16) in the enable register. //Sets the enable register (bit 4 is set) STAT:QUES:ENAB 16 The following query returns the bits enabled in the register. //Queries the enable register STAT:QUES:ENAB? Typical Response: +16 See Also STATus:PRESet STATus:QUEStionable:CONDition? STATus:QUEStionable[:EVENt]? Keysight U2741A Programmer’s Reference Guide...

  • Page 123: Status:questionable[:Event]

    This command queries the event register for the Questionable Data Register group. This is a read-only register and the bits are cleared when you read the register. For more information on the SCPI Status System, see Chapter NOTE Keysight U2741A Programmer’s Reference Guide...
  • Page 124 – For example, if bit 1 (decimal value = 2) and bit 9 (decimal value = 512) are set, this command will return +514. Keysight U2741A Programmer’s Reference Guide...
  • Page 125 STATus Subsystem Example //Reads the questionable register (bit 9 STAT:QUES? is set) Typical Response: +512 See Also STATus:QUEStionable:CONDition? STATus:QUEStionable:ENABle Keysight U2741A Programmer’s Reference Guide...
  • Page 126 STATus Subsystem THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 127 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide SYSTem Subsystem SYSTem:CDEScription? SYSTem:ERRor? SYSTem:LFRequency SYSTem:PRESet SYSTem:VERSion? This chapter explains how the SYSTem command subsystem functions.

  • Page 128: System Subsystem

    Syntax SYSTem:CDEScription? Description This query identifies which slot and chassis that the U2741A is plugged into the U2781A, and returns the slot and chassis number respectively. Remarks – If the U2741A is in standalone mode, then this query would return +7,+0.

  • Page 129: System:error

    – If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with –350, “Queue overflow”. – If no errors have occurred when you read the error queue, the U2741A responds with +0, “No error”.

  • Page 130: System:lfrequency

    Parameter Item Type Range of values Defaul t value value Numeric 50 Hz, 60 Hz 50 Hz Examples //Sets the line frequency to 50 Hz SYST:LFR 50 //Queries the line frequency SYST:LFR? Typical response: 50 Keysight U2741A Programmer’s Reference Guide...

  • Page 131: System:preset

    SYSTem Subsystem SYSTem:PRESet Syntax SYSTem:PRESet It resets the hardware and set it to the factory default settings. Remarks It does the same function as a *RST command would do. Example SYST:PRES See Also *RST Keysight U2741A Programmer’s Reference Guide...

  • Page 132: System:version

    SYSTem:VERSion? Description This query returns the version of the SCPI standard in which the U2741A complies with. The version is in a numeric form YYYY.V, where YYYY represents the year of the version and V represents a version for that year.

  • Page 133: Trigger Subsystem

    Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide TRIGger Subsystem TRIGger:SOURce This chapter explains how the TRIGger command subsystem functions.

  • Page 134: Trigger:source

    – The bus trigger mode is initiated by sending a bus trigger command (*TRG), after selecting BUS as the trigger source. – The star trigger is only applicable when the U2741A is used in the U2781A chassis. It is use for triggering multiple units in the chassis.
  • Page 135 TRIGger Subsystem Examples //Sets the trigger source to bus TRIG:SOUR BUS //Queries the source setting TRIG:SOUR? Typical Response: BUS See Also *TRG Keysight U2741A Programmer’s Reference Guide...
  • Page 136 TRIGger Subsystem THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 137 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide Other Commands ABORt FETCh? INITiate[:IMMediate] READ? UNIT:TEMPerature This chapter explains the operation of the other system commands that are not categorized under major subsystems.

  • Page 138: Other Commands

    – When trigger source is set to BUS, the INIT command will change the state of the triggering system from the “idle” state to the “wait-for-trigger” state. At this time, if the ABOR command is issued, *TRG is not allowed, the U2741A will return a system error –211, “Trigger ignored”.

  • Page 139: Fetch

    Other Commands FETCh? Syntax FETCh? This command transfers the reading to the U2741A output buffer where you can read it into your PC. Remarks – The FETCh? command will wait until the measurement is complete to terminate. – The U2741A clears any reading from volatile memory after a factory reset...

  • Page 140: Initiate[:Immediate]

    Remarks – To retrieve the reading, use the FETC? command. – The ABOR command may be used to set the U2741A to idle state. – The INIT command only initiates the measurement and needs a trigger (BUS or IMMediate) to make the actual measurement.

  • Page 141: Read

    READ? Syntax READ? This command changes the U2741A triggering 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. The reading is then sent immediately to volatile memory and the U2741A output buffer.

  • Page 142: Unit:temperature

    – The temperature unit selection is stored in nonvolatile memory. The selection is set to °C after a factory reset (*RST command). Examples //Sets the temperature unit to Celcius UNIT:TEMP C //Queries the temperature unit setting UNIT:TEMP? Typical Response: C Keysight U2741A Programmer’s Reference Guide...
  • Page 143 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide IEEE Common Commands *CLS *ESE/*ESE? *ESR? *IDN? *OPC/*OPC? *RST *SRE/*SRE? *STB? *TRG *TST? This chapter gives an introduction to the IEEE-488.2 common commands. It defines a set of common commands that perform functions such as reset,...

  • Page 144: Ieee Common Commands

    IEEE Common Commands *CLS Syntax *CLS This command is used to clear the event registers in all register groups and also clears the error queue. Example //This will clear the event register bits *CLS Keysight U2741A Programmer’s Reference Guide...

  • Page 145: Ese/*Ese

    Status Registers” on page 19. Examples //This command enables bit 4 (decimal *ESE 16 value = 16) in the enable register //This query returns the bits that are *ESE? enabled in the register Typical Response: +16 Keysight U2741A Programmer’s Reference Guide...

  • Page 146: Esr

    “SCPI Status Registers” on page 19. Example //This command enables bit 4 (decimal *ESE 16 value = 16) in the enable register //The query will return the bits enabled *ESR? in the register Typical Response: +16 Keysight U2741A Programmer’s Reference Guide...

  • Page 147: Idn

    The first field is the manufacturer's name, the second is the model number of the U2741A, the third is the serial number, and the fourth is the firmware revision number. This query returns a string with the following format.

  • Page 148: Opc/*Opc

    Other commands cannot be executed until this command completes. Examples //This command sets the “Operation *OPC Complete” bit (bit 0) //The following query returns 1 after the *OPC? operation has completed Typical Response: 1 Keysight U2741A Programmer’s Reference Guide...

  • Page 149: Rst

    IEEE Common Commands *RST Syntax *RST This command resets the U2741A to its factory default state. Refer to Chapter 13, “Factory Default Settings” on page 165 for a complete NOTE listing of the U2741A default settings. Example //This command resets the U2741A *RST Keysight U2741A Programmer’s Reference Guide...

  • Page 150: Sre/*Sre

    Chapter 2, “SCPI Status Registers” on page 19. Examples //This command enables bit 4 (decimal *SRE 16 value = 16) in the enable register //This query returns the bits enabled in *SRE? the register Typical Response: +16 Keysight U2741A Programmer’s Reference Guide...

  • Page 151: Stb

    This command returns the same result as a Serial Poll but the “Master Summary” bit (bit 6) is not cleared by the *STB? command. Example //This query reads the Status Byte register *STB? (assume that bits 3 and 4 are set) Typical Response: +24 Keysight U2741A Programmer’s Reference Guide...

  • Page 152: Trg

    (software) trigger source is currently selected. Remarks After setting the trigger source, you must set the U2741A to the “wait-for-trigger” state using the INITiate command. The *TRG command will not be accepted unless the U2741A is in the “wait-for-trigger” state.

  • Page 153: Tst

    IEEE Common Commands *TST? Syntax *TST? This query command performs a self-test of the U2741A and returns a pass/fail indication. Remarks The command returns +0 (all tests passed) or +1 (one or more tests failed). Example //This query command performs a...
  • Page 154 IEEE Common Commands THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...

  • Page 155: Scpi Error Messages

    Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide SCPI Error Messages SCPI Error Messages This chapter lists down all the SCPI command errors.

  • Page 156: Scpi Error Messages

    –350, “Queue overflow”. No additional errors are stored until you remove errors from the queue. If no errors have occurred when you read the error queue, the U2741A responds with +0, “No error”. – The error queue is also cleared by the clear status (*CLS) command or when the power is cycled.
  • Page 157 –124 Too many d igits The mantissa of a numeric parameter contained more than 255 digits, excluding leading zeros –128 Numeric data not allowed A numeric parameter was received but a character string was expected Keysight U2741A Programmer’s Reference Guide...
  • Page 158 The number of data bytes sent does not match the number of bytes specified in the header –168 Block data not allowed Data was sent in arbitrary block format but is not allowed for this command Keysight U2741A Programmer’s Reference Guide...

  • Page 159: Execution Errors

    –202 Settings lost due to RTL A setting associated with a hard local control was lost when the device changed to LOCS from REMS or to LWLS from RWLS –210 Trigger error Generic trigger error Keysight U2741A Programmer’s Reference Guide...
  • Page 160 A data element could not be executed because the value was outside the valid range –223 Too much data A data element was received that contains more data than the U2741A can handle –224 Illegal parameter value An exact value was expected but not received –230...
  • Page 161 The macro label defined in the *DMC command could not be executed because the macro label was already defined –278 Macro header not found A syntactically legal macro label in the *GMC? query could not be executed because the header was not previously defined Keysight U2741A Programmer’s Reference Guide...

  • Page 162: Device Dependent Errors

    Device dependent errors –310 System error This indicates that some error, termed as “system error” by the device, has occurred. The U2741A internal operation has not completed properly, possibly due to an abnormal hardware or firmware condition. –313 Calibration memory lost...

  • Page 163: Query Errors

    This indicates that the U2741A has failed to retrieve the valid calibration constants from the nonvolatile memory A/D & FE measure zero This indicates that the U2741A has failed to communicate with A/D converter or has front end switching error Keysight U2741A Programmer’s Reference Guide...
  • Page 164 A calibration in progress is aborted when you send a device clear, or change the local/remote state of the multimeter Cal value out of range The specified calibration value (CALibration:VALue) is invalid for the present function and range Keysight U2741A Programmer’s Reference Guide...
  • Page 165 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Programmer’s Reference Guide Factory Default Settings This chapter will list the factory default settings.
  • Page 166 Factory Default Settings Remarks – The U2741A is shipped with the factory default settings. – It is set once the *RST or SYST:PRES command is sent to the U2741A. – Below are the factory default settings. Measurement configuration Factory settings...
  • Page 167 Factory settings Range AUTO (1 kΩ) Autozero Resolution 1.50e–6 NPLC FRES parameters Factory settings Range AUTO (1 kΩ) Resolution 1.50e–6 NPLC TEMP parameters Factory settings Probe type THER Autozero Resolution 1.50e–6 NPLC Unit temperature °C Keysight U2741A Programmer’s Reference Guide...
  • Page 168 Factory Default Settings THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Programmer’s Reference Guide...
  • Page 169 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2008, 2014, 2017 Edition 3, June 1, 2017 Printed in Malaysia *U2741-90011* U2741-90011 www.keysight.com...

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