Fluke 74X Series, Calibration Manual

Page: 35 / 44

Performance Verification Tests
27
RTD Source
Proceed as follows to verify the RTD Source function:
1. Connect the UUT to the HP3458A DMM as shown in Figure 9. Use a 4-wire
connection transitioning to 2-wires at the UUT. Set the HP3458A to 4-Wire Ohms,
auto-range.
2. Set the UUT to the RTD Source function, Pt100 (385) at -180
°
C, ITS-90 scale.
3. Observe the resistance reading on the DMM and check to see if it is within the range
shown under the appropriate column in Table 17.
4. Continue through the test points.
5. When you are finished, press
c
twice on the UUT to set the Source function to off.
This saves 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 27.053 27.139 27.011 27.181
100
°
C 138.505 138.429 138.581 138.353 138.657
780
°
C 369.712 369.592 369.832 369.562 369.862