Rtd Measure, Three-Wire - Fluke 74X Series Calibration Manual

74X Series
Calibration Manual

RTD Measure, Three-Wire

Proceed as follows to verify the three-wire RTD measure function. If a 5500A is not
available, substitute a variable resistance source such as a General Resistance RTD-100
RTD Simulator and a DMM to measure the variable resistance source accurately. Use the
resistance equivalents shown in Table 16.
1. Connect the UUT to the 5500A as shown in Figure 13.
2. Set the UUT to the RTD Measure function, Pt100 (385), ITS-90 scale, 3-Wire
3. Set the 5500A to RTD, Pt100 (385) at -180 °C, ITS-90 scale, and comp four-wire to
4. Observe the reading on the UUT and check to see if it is within the range shown
5. Continue through the test points.
6. When you are finished, set the 5500A to [Standby].
Input °C (Resistance)
-180 ° (27.096Ω)
100 ° (138.505Ω)
780 ° (369.712Ω)
26
termination.
"OFF" position. Set the 5500A to [Operate].
under the appropriate column in Table 16.
FLUKE 74X
V mA mA V
RTD
RTD
CAT
SOURCE MEAS
30V 300V
TC
MAX 30V 30V MAX
MAX MAX
3 WIRE RTD
Figure 13. Three-Wire RTD Measure Verification Connections
Table 16. RTD Measure Verification (100W Pt (385), Three-Wire Connection)
FLUKE 5500A CALIBRATOR
1-Year ( °C )
-179.3 to -180.7
99.1 to 100.9
778.8 to 781.2
5500A CALIBRATOR
NORMAL AUX SCOPE
200V PK
A, -SENSE,
V, ,
MAX
RTD AUX V
HI
1000V 20V
RMS RMS
MAX MAX
TRIG
LO
OUT
1V PK
MAX
20V PK
MAX
TC
20V PK
MAX
2-Year ( °C )
-179.1 to -180.9
98.8 to 101.2
778.6 to 781.4
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