© Sensortech Systems, Inc. 2014 Page 9 of 15 Rev.5-2014
PMT-330 Tester Calibration
Zero/Reference
The Zero/Reference calibration calculates the Pre-Zero by taking a measurement of the air humidity,
temperature, mechanical and electrical conditions of the PMT-330 before measuring product moisture,
i.e. with no moisture or material near the Sensor Electrode. This calibration value is subsequently
subtracted from measurements to indicate only product moisture. At completion of the Zero/Reference
calibration, the message ‘Zero/Reference Done’ will be displayed. The PMT-330 then returns to
Continuous Measurement mode.
The Zero/Reference calibration is intended to be performed before each use of the PMT-330.
To perform a Zero/Reference Calibration:
1. Hold the PMT-330 off the table and away from product with the Sensor Electrode clear of any objects,
moisture or material.
2. Press <ENTER> to start the Zero/Reference calibration. After a short period (approx. 1 second), the
message ‘Zero/Reference Done’ will be displayed and the calibration is complete.
Figure 5. Zero/Reference Calibration Sequence
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