– 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>).
– When you initiated a measurement on the selected channels, the acquired temperature is saved in reading
memory in the reference register. Subsequent thermocouple measurements use the saved temperature as their
reference.
– At power-on, the reference register is loaded with "9.9E+37". Note that after you have saved a reference tem-
perature, all thermocouple measurements that specify an external reference source will be returned as
"9.9E+37". Use the [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE EXTernal? command to read
the most-recently saved reference temperature value.
[SENSe:]TEMPerature:TRANsducer:{RTD | FRTD}:RESistance[:REFerence] {<resistance> | MIN |
MAX | DEF} [, (@<ch_list>)]
[SENSe:]TEMPerature:TRANsducer:{RTD | FRTD}:RESistance[:REFerence]? [{(@<ch_list>) | MIN |
MAX | DEF}]
Only supported in DAQM901A, DAQM902A, and DAQM908A multiplexer modules.
Parameter is shared between RTD and FRTD measurements. Setting or querying the parameter with the RTD
version of this command is identical to setting or querying it with the FRTD version.
Selects the nominal resistance (R
0
) for 2-wire and 4-wire RTD measurements. R
0
is the nominal resistance of an
RTD at 0 °C.
Parameter Typical return
<resistance>: 100 ohms ± 1% or 1000 ohms ± 1%
Default: 100
+1.00000000E+02
Sets the nominal resistance to 100 Ω: TEMP:TRAN:RTD:RES:REF 100
– 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>).
– This parameter is set to its default value after a Factory Reset (*RST command).
264
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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