[SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE {INTernal | EXTernal | FIXed}
[, (@<ch_list>)]
[SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE? [(@<ch_list>)]
External reference is not supported in DMM Digitize data acquisition mode.
Error -221,"Settings conflict; DMM digitizing mode has been disabled" will be generated when you send the
command to select an external reference for the thermocouple temperature measurement in DMM Digitize
mode.
Thermocouple measurements require a reference junction temperature. For the reference junction temperature,
you can use an internal measurement on the module's terminal block, an external thermistor or RTD measurement,
or a known fixed junction temperature. This command selects the reference junction source for thermocouple meas-
urements on the specified channels.
Parameter Typical return
{INTernal | EXTernal | FIXed}
Default: INT
INT, EXT, or FIX
Sets the reference junction type to an external thermistor on specified channel:
TEMP:TRANS:TC:RJUN:TYPEEXT
– The accuracy of the measurement is highly dependent upon the thermocouple connections and the type of ref-
erence junction used. Use a fixed temperature reference for the highest accuracy measurements (you must main-
tain the known junction temperature). The internal isothermal block reference requires no external wiring but
provides lower accuracy measurements than a fixed reference.
– If you select an external reference, the instrument makes thermocouple measurements relative to a previously-
stored RTD or thermistor measurement stored in the reference register. To store a reference temperature, first
configure a multiplexer channel for an RTD or thermistor measurement (see CONFigure:TEMPerature com-
mand). Then assign the measurement from that channel as the external reference using one of the following com-
mands:
– [SENSe:]TEMPerature:TRANsducer:{RTD|FRTD}:REFerence
– [SENSe:]TEMPerature:TRANsducer:{FTHermistor|THERmistor}:REFerence
– When you initiate a measurement on an external reference channel (see INITiate or READ? command), sub-
sequent thermocouple measurements use the stored temperature as their reference. The temperature is used
for all subsequent thermocouple measurements on that card.
– If you select a fixed reference junction source, you can specify a value between -20 °C and +80 °C using the
[SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction command. You must always specify the temperature in
degrees Celsius regardless of the temperature units currently selected (see UNIT:TEMPerature command).
– This parameter is set to its default value after a Factory Reset (*RST command).
Keysight DAQ970A/DAQ973A Programming Guide 269
2 SCPI Programming
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