Fluke 725 ex [31/54] Lower display 4 wire rtd measurement

Multifunction Process Calibrator

Performance Tests

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