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11 4 HART Diagnostics and Service
When the measurement is active in HART Communication Interface, you can press Service to display the HART diagnostic
and service interface (Figure 11.6). The calibrator provides Loop Test, PV (Primary Variable) Zero Trim, PV Calibration, Output
Trim and Special Calibration operations to calibrate a transmitter. Note that Loop Test and Output Trim are not available if the
transmitter is in multi-drop mode.
The Loop Test operation will send a command to the transmitter to set its
analog output to the specified value To perform a Loop Test operation
proceed as follows
1 In the HART diagnostic and service interface, choose Loop Test from
list, and press Enter or Select to show Loop Test interface (Figure 11.7).
2
value. Its range is from 4 to 20mA. Then press or to start
3 If the Loop Test is successfully executed, the PVAO at the top of the interface
will show the specified value, the calibrator will show the measured current
value in the middle of the interface. Otherwise a popup will indicate the
“HART evice ot ound”.
11 4 2 PV Zero Trim
The PV Zero Trim operation sends a command to the transmitter to set its
PV zero. To perform a PV Zero Trim operation, proceed as follows:
Figure 11 7 HART Loop Test
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