3 Performance Verification
94 Keysight DAQ970A/DAQ973A Service Guide
Thermocouple Reference Junction Verification (Optional)
To make a thermocouple measurement a known reference junction temperature
measurement must be made. The reference junction temperature is measured by
three solid state temperature sensors in the input connection area on the module.
Thermocouple measurements are only supported by the DAQM900A, DAQM901A,
and DAQM902A.
1 Read the “Plug-in Module Test Considerations” on page 76.
2 Connect a calibrated thermocouple with an accuracy of 0.1 °C or better to one
of the following channels:
– For the DAQM900A: Channel 1 and 20
– For the DAQM901A: Channel 1 and 20
– For the DAQM902A: Channel 1 and 16
3 Install the module in slot 100.
4 Place the J Type calibrated thermocouple at a known temperature (ice bath or
calibrator).
5 Select Channel 101. Configure the channel as follows:
TEMPERATURE
THERMOCOUPLE
J TYPE
INTEG 10 PLC
INTERNAL REF (Advanced menu)
Before executing each test, you must press [Monitor] to enable reading
monitoring on the selected channel (or use the ROUTe:MON command from the
remote interface).
6 Subtract the thermocouple error from the displayed temperature. Verify the
result is within ±1.0 °C of the known temperature (set in step 4).
NOTE
You should perform these verification and adjustments if you are using the
modules for thermocouple measurements.
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