Lower Display 4-Wire Rtd Measurement - Fluke 724 Calibration Manual

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Calibration Manual

Lower Display 4-Wire RTD Measurement

1. Press R on the UUT until the lower display reads PT3916. If necessary, use D
2. Set the 5520A to 2-wire output with 2-wire compensation off; then make the
3. Set the 5520A to source the resistance values in Table 13 and verify that the UUT
5520A Outputs (°C)
-180.0 (25.799 Ω)
100.0 (139.171 Ω)
550.0 (300.822 Ω)
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to select °C units and X to get to the 4W mode. (MEASURE should also appear on
the lower display.)
connections shown in Figure 8.
temperature readings are within the limits shown for the 4-wire readings.
Table 13. Lower Display 4-Wire and 3-Wire RTD Temperature Readings
3-Wire UUT Readings (°C)
-179.5 to -180.5
99.5 to 100.5
549.5 to 550.5
4-Wire UUT Readings (°C)
-179.7 to -180.3
99.7 to 100.3
549.7 to 550.3