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744
HART Mode Users Guide
16
7. Proceed with calibration as usual (described in the
744 Users Manual
).
8. Press the
Adjust softkey. This returns you to HART
mode, and presents you with the Service menu for the
transmitter.
9. Do an Output Trim, a Sensor Trim, or both. These are
Service Operations, and are described later in this
manual. When you have finished with the trim
procedures, press the
Done softkey.
10. Press the
As Left softkey and repeat the calibration
procedure to verify that the transmitter passes.
Loop Test
The Loop Test feature sends a command to the transmitter
to set its output stage to a specified value. Use this to
check the calibration of the output stage, or to check for
proper reading on an external loop reading device.
To perform a Loop Test:
1. From the Active Device screen Press the
Service
softkey, followed by Loop Test.
pe15s.bmp
2. Press a softkey to command the transmitter to set its
analog output to the corresponding value, or manually
enter a value with the numeric keys.
In the middle of the screen the transmitter acknowledges
the selected PVAO (digital representation of the Output
stage). The calibrator shows the measured value at the top
of the screen, so you can use Loop Test as a quick way to
check the calibration of the transmitter’s Output stage.