Calibration
9190A Input Panel Calibration 4
4-21
UUT Thermocouple Calibration
Table 4-14 shows the order of the tests to be performed on the UUT thermocouple input.
Table 4-14. Thermocouple Input Testing Process
# Test Name Nominal(s) mV Notes
1 Thermocouple Accuracy Test −10, 0, 50, 100 As Found/Alignment data
2 Thermocouple Reference Junction
Accuracy Test
25 °C As Found/Alignment data
3 Thermocouple Reference Junction
Alignment
- Calculate reference junction offset with
Alignment data
4 Thermocouple Accuracy Alignment - Calculate offsets with Alignment data
5 Thermocouple Reference Junction
Accuracy Test
25°C As Left data
6 Thermocouple Accuracy Test −10, 0, 50, 100 As Left data
Thermocouple Accuracy Test
The Thermocouple Accuracy Test is used to collect As Found, Alignment, and As Left
data.
Perform the Thermocouple Accuracy Test as follows:
1. Connect the voltage source.
2. Turn on the TC reference in the UUT.
3. Set the instrument conversion type for the UUT thermocouple input to mV.
4. Turn on and set the voltage source to -10 mV.
5. Let the readout stabilize for a minimum of 20 seconds.
6. Take a minimum of 40 samples at a 2-second interval.
7. Turn on and set the voltage source to 0 mV.
8. Let the readout stabilize for a minimum of 20 seconds.
9. Take a minimum of 40 samples at a 2-second interval.
10. Turn on and set the voltage source to 50 mV.
11. Let the readout stabilize for a minimum of 20 seconds.
12. Take a minimum of 40 samples at a 2-second interval.
13. Turn on and set the voltage source to 100 mV.
14. Let the readout stabilize for a minimum of 20 seconds.
15. Take a minimum of 40 samples at a 2-second interval.
16. Calculate the average of the measurements taken.
17. Record the data as appropriate for the type of calibration or step in the process.
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