Thermocouple Source - Fluke 753 Calibration Manual

Input dcmV (referenced to 0 °C)
-5.550 mV (-180 °C)
0.000 mV (0 °C)
52.410 mV (1300 °C)
Temp. °C 18
mV 0.718

Thermocouple Source

To verify the thermocouple source function:
This test uses a Type-K thermocouple setting on the UUT.
1. Use Type-K thermocouple wire and copper wire to connect the 8508A to the
UUT -TC jack as shown in Figure 10 (the 8508A is used in place of the 5522A).
The type K-to-copper junctions must be welded or made with tight screw
terminals and submersed in the lag bath (room temperature). Use the standard
thermometer (0.1 % accuracy) to measure the temperature of the lag bath.
2. Set the UUT to the thermocouple source function, linear mode, TC type K, ITS-
90 scale, internal reference, and °C.
3. Set the 8508A to measure mV dc.
4. Stop for a minimum of 1 minute for thermal "emfs" (caused by insertion of the
connectors) to dissipate, and let the lag bath become stable for a minimum of 15
minutes.
5. Source each of the temperatures in Table 14 from the UUT. At each point,
correct the DMM measured voltage. To do this, add the millivolt equivalent of
the Type-K junction at the lag bath temperature (use the Type-K ITS-90 chart).
6. Continue through the test points. See if the value shown on the UUT is in the
range shown in the applicable column in Table 14.
7. When you complete the test, push  on the UUT two times to turn the source
function off. This conserves battery life.
Table 13. Temperature Measure Verification
Minimum
1-Year °C
-180.9
-0.5
1299.1
Lag Bath Reference Table, Type K, ITS-90
19 20 21
0.758 0.798 0.838 0.879
Note
Maximum
1-Year °C
-179.1
0.5
1300.9
22 23 24 25
0.919 0.960 1.000
Documenting Process Calibrator
Performance Verification Tests
Minimum Maximum
2-Year °C 2-Year °C
-181.2 -178.8
-0.6 0.6
1298.8 1301.2
26 27 28
1.041 1.081 1.122
25