Loop Power; Hart Mode Verification (754 Only) - Fluke 753 Calibration Manual

753/754
Calibration Manual

Loop Power

To verify the loop power function.
Fluke 75X

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.
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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.
Figure 13. Loop Power Verification Connections
Fluke 8508A
gso15.eps