Additel 221A Multifunction Temperature Calibrator User Manual - Manual (Page 79)

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Loop Test.
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 device not found”.
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