Multifunction Process Calibrator
Performance Tests
21
Lower Display 4-Wire RTD Measurement
1. Press R on the UUT until the lower display reads PT3916. If necessary, use D
to select °C units and X to get to the 4W mode. (MEASURE should also appear on
the lower display.)
2. Set the 5520A to 2-wire output with 2-wire compensation off.
3. Make the connections shown in Figure 8.
4. Set the 5520A to source the resistance values in Table 11 and verify that the UUT
temperature readings are within the limits shown for the 4-wire readings.
Table 11. Lower Display 4-Wire and 3-Wire RTD Temperature Readings
5520A Outputs (°C) 3-Wire UUT Readings (°C) 4-Wire UUT Readings (°C)
-180.0 (25.799 Ω) -179.5 to -180.5 -179.7 to -180.3
100.0 (139.171 Ω) 99.5 to 100.5 99.7 to 100.3
550.0 (300.822 Ω) 549.5 to 550.5 549.7 to 550.3
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