– For thermocouple measurements, the instrument internally selects the 100 mV range. For thermistor and RTD
measurements, the instrument autoranges to the correct range for the transducer resistance measurement.
Specify the paired channel in the lower bank (source) as the <scan_list> channel.
– Thermocouple measurements require a reference junction temperature
(see [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE command). For the reference junction tem-
perature, you can use an internal measurement on the module's terminal block (DAQM900A, DAQM901A, and
DAQM902A), an external thermistor or RTD measurement, or a known fixed junction temperature. 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.
– By default, a fixed reference junction temperature of 0.0 °C is used
(see [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction command).
– If you select autoranging (by specifying "AUTO" or "DEF"), an error will be generated if you specify a discrete value
for the <resolution> parameter. When autoranging is combined with a discrete resolution, the instrument can-
not accurately resolve the integration time (especially if the input signal is continuously changing). If your applic-
ation requires autoranging, be sure to specify "DEF" for the <resolution> parameter, or omit the parameter from
the command and use the [SENSe:]TEMPerature:NPLC command to specify the desired integration time.
– Since this command resets all measurement parameters on the specified channels to their default values, be sure
to send the CONFigure command before setting any other measurement parameters.
– For 4-wire resistance measurements, the instrument automatically pairs channel n in Bank 1 with channel n+10
in Bank 2 (DAQM900A or DAQM901A) or n+8 (DAQM902A) to provide the source and sense connections. For
example, make the source connections to the HI and LO terminals on channel 02 in Bank 1 and the sense con-
nections to the HI and LO terminals on channel 12 (DAQM900Aor DAQM901A) or 10 (DAQM902A) in Bank
2.Specify the paired channel in Bank 1 (source) as the <ch_list> channel (paired channels in Bank 2 are not
allowed in the <ch_list>).
– Because channels are automatically paired for 4-wire resistance measurements, attempts to re-configure the
paired channel in Bank 2 will result in an error. For example:
CONF:VOLT:DC (@105) !Configure Bank 2 channel for DC voltage measurements
ROUT:SCAN (@101:110) !Add channels to scan list
CONF:FRES (@101) !Generates error and clears scan list
– For 4-wire RTD measurements, the instrument automatically enables the autozero function.
– The *RST command will clear the scan list and set all measurement parameters to their factory settings. The
Instrument Preset (SYSTem:PRESet command) will not clear the scan list; however, this command will clear read-
ing memory and all stored statistical data.
104
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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