Fluke 2625A - Manual (Page 139)

Maintenance
Performance Tests
6
6-11
Note
4-terminal connections are made using pairs of channels. 4-terminal
measurements can only be made on channels 1 through 10. The
accompanying pairs are channels 11 through 20.
Thermocouple Temperature Accuracy Test
Assure the Thermocouple Measurement Range Accuracy Test meets minimum
acceptable levels before performing this test.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a K-type thermocouple to the H (high) and L (low) terminals of channel
1. Install the Input Module back into the instrument.
Note
If other than a K type thermocouple is used, be sure that the instrument is
set up for the type of thermocouple used.
3. Reconnect power and switch the instrument ON.
4. Insert the thermocouple and a mercury thermometer in a room temperature bath.
Allow 20 minutes for thermal stabilization.
5. Select the temperature and K-type thermocouple function for channel 1. Press MON.
6. The value displayed should be the temperature of the room temperature bath as
measured by the mercury thermometer (within tolerances given in Table 6-4, plus
any sensor inaccuracies.)
7. The Thermocouple Temperature Accuracy Test is complete. However if you desire
to perform this test on any other Input Module channel (2 through 20) repeat steps 1
through 6 substituting in the appropriate channel number.