Documenting Process Calibrator
Performance Verification Tests
29
RTD Source
To verify the RTD Source function:
1. Connect the UUT to the 8508A DMM as shown in Figure 8. Use a four-wire
connection transitioning to two-wires at the UUT.
2. Set the 8508A to 4-Wire Ohms, auto-range.
3. Set the UUT to the RTD source function, Pt100 (385) at -180 °C, ITS-90 scale.
4. See if the value shown on the DMM is in the range shown in the applicable
column in Table 17.
5. Continue through the test points.
6. When you complete the test, push on the UUT two times to turn the source
function off. This conserves battery life.
Table 17. RTD Source Verification (100W Pt (385))
UUT
Output
Nominal (Ohms)
Minimum
1-Year
Maximum
1-Year
Minimum
2-Year
Maximum
2-Year
-180 °C 27.096 27.075 27.118 27.054 27.139
100 °C 138.505 138.487 138.524 138.468 138.543
780 °C 369.712 369.6707 369.7532 369.630 369.795
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