Thermocouple Reference Junction Verification (Optional) - Keysight Technologies DAQ970A Service Manual

3 Performance Verification

Thermocouple Reference Junction Verification (Optional)

You should perform these verification and adjustments if you are using the
NOTE
modules for thermocouple measurements.
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
2 Connect a calibrated thermocouple with an accuracy of 0.1 °C or better to one
3 Install the module in slot 100.
4 Place the J Type calibrated thermocouple at a known temperature (ice bath or
5 Select Channel 101. Configure the channel as follows:
6 Subtract the thermocouple error from the displayed temperature. Verify the
94
"Plug-in Module Test Considerations"
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
calibrator).
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
remote interface).
result is within ±1.0 °C of the known temperature (set in step 4).
on page 76.
ROUTe:MON
Keysight DAQ970A/DAQ973A Service Guide
command from the