Agilent 34970A/34972A Data Acquisition / Switch Unit

Chapter 4 Calibration Procedures
Thermocouple Reference Junction (Optional)
Thermocouple Reference Junction (Optional)
Note: You should perform these verification and adjustments if you are
using the 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 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 97.
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)
Before executing each test, you must press 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).
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