754_____cmeng0000.pdf - 第37页
Documenting Process Calibrator Performance Verification Tests 29 RTD Source To verify the RTD Source function: 1. Connect the UUT to the 8508A DMM as shown in Figure 8. Use a four-wire connection transitioning to two-wir…
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6. Continue through the test points.
7. When you complete the test, set the 5522A to STANDBY.
5522A
CALIBRATOR
Fluke 75X
Fluke 5522A
gso14.eps
Figure 12. Three-Wire RTD Measure Verification Connections
Table 16. RTD Measure Verification (100W Pt (385), Three-Wire Connection)
Input °C (Resistance) 1-Year ( °C ) 2-Year ( °C )
-180 °
(
27.096 Ω
)
-179.53 to -180.47 -179.46 to -180.54
100 °
(
138.505 Ω
)
99.53 to 100.47 99.46 to 100.54
780 ° (369.712 Ω) 779.39 to 780.61 779.19 to 780.81
Documenting Process Calibrator
Performance Verification Tests
29
RTD Source
To verify the RTD Source function:
1. Connect the UUT to the 8508A DMM as shown in Figure 8. Use a four-wire
connection transitioning to two-wires at the UUT.
2. Set the 8508A to 4-Wire Ohms, auto-range.
3. Set the UUT to the RTD source function, Pt100 (385) at -180 °C, ITS-90 scale.
4. See if the value shown on the DMM is in the range shown in the applicable
column in Table 17.
5. Continue through the test points.
6. When you complete the test, push on the UUT two times to turn the source
function off. This conserves 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 27.075 27.118 27.054 27.139
100 °C 138.505 138.487 138.524 138.468 138.543
780 °C 369.712 369.6707 369.7532 369.630 369.795
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Loop Power
To verify the loop power function.
1. Connect the UUT to the 8508A DMM as shown in Figure 13.
2. On the UUT push s, , select Loop Power, and push again.
3. Observe the no-load voltage reading on the DMM and verify that it is within the
range 23.4 V to 28.6 V.
4. When complete, disable Loop Power through the setup menu or turn the UUT
off. This conserves battery life.
Fluke 75X
Fluke 8508A
gso15.eps
Figure 13. Loop Power Verification Connections
HART Mode Verification (754 Only)
The subsequent test makes sure that the 754 can communicate over a serial HART®
(Highway Addressable Remote Transducer) interface to a HART transmitter. The
calibrator communicates with virtually all HART transmitters and related software
versions. These are “supported transmitters”. All other transmitters are “generic”. A
Smart (HART) Pressure Transmitter is necessary for this procedure. The Rosemount
Models 1151 or 3051 are recommended (may be substituted with any HART
communicator protocol device).
This verification test is a pass or fail test. No calibration is necessary for the HART
mode. If the Product fails this test, repair is necessary. Refer to the 754 HART Mode
Users Guide for more data on the HART feature.