Calibration Procedures 4
Keysight 34970A/34972A Service Guide 119
Thermocouple Reference Junction (Optional)
To make a thermocouple measurement a known reference junction temperature
measurement must be made. The reference junction temperature is measured by
two solid state temperature sensors in the input connection area on the module.
The adjustments store calibration constants used to correct the measurements
from the temperature sensors.
Thermocouple measurements are supported by only the 34901A, 34902A and
34908A.
Thermocouple Reference Junction Verification
1 Read “Plug-in Module Test Considerations” on page 94.
2 Connect a calibrated thermocouple with an accuracy of 0.1 °C or better to one
of the following channels:
For the 34901A: Channel 10
For the 34902A: Channel 8
For the 34908A: Channel 10
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 110 (or 108). Configure the channel as follows:
TEMPERATURE
THERMOCOUPLE
J TYPE
INTEG 10 PLC (Advanced menu)
INTERNAL REF (Advanced menu)
You should perform these verification and adjustments if you are using the
modules for thermocouple measurements.
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