Martel Electronics BetaGauge 321A - Manual (Page 21)

9. Press the “NEW TEST” option to clear the data and perform another test.
10. Press the “DONE” option to end the test and return to the standard pressure setting.
Example: [P1] ST will return to [P1].
Important NOTE: The previous example uses a normally closed switch. The basic
procedure is still the same for a normally open switch, the display will just read “OPEN”
instead of “CLOSE”.
8. Calibrating Transmitters
8.1 Using the mA Input Function
The mA input function allows the user to read back the 4-20 mA output from the device
being calibrated. This can be done in one of two ways.
1) Passively – Where the device under test directly generates 4-20 mA and can be read
by the calibrator.
2) Actively – Where the calibrator supplies 24 VDC loop power to the device under test to
power the device while reading the resulting 4-20 mA signal.
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