Calibration Setting; Carrying Out A Measurement; Zero Adjustment (Relative Measurement) - VOLTCRAFT GM-70 Notice D'emploi

• Use the REC button (6) to select the 'Unit' menu item. Here you can switch the unit of measurement.
• Press the MODE - DC AC button (7) to select the unit of measurement.
- t = millitesla (mT)
- g = Gauss (g)
• Confirm your selection with the REC button (6) or end setting without saving with the HOLD button (5). Your
selection will be saved. The display switches back to normal measuring mode.
d) Calibration setting
The 'CLr' calibration function is only intended for maintenance and adjustment work by trained specialist
personnel. Access this menu only without making adjustments. Do not change its settings.

10. Carrying out a measurement

The highly sensitive sensor always displays a low value in normal operation. This value corresponds to the
earth's magnetic field and can be compensated for with the zero adjustment.
The measuring device can measure magnetic DC and AC fields. The measuring mode must be adjusted according to
the field type as well as the measurement resolution.
Every movement of the sensor can lead to a measured value fluctuation. For stationary measurements,
move the sensor to the object being tested before testing and only then switch on the measuring device.
a) Zero adjustment (relative measurement)
The display already shows earth's magnetic field as picked up by the highly sensitive sensor. The display can be reset
to zero to ensure that this value is not incorporated into the measurement. Always carry out zero adjustment before
measuring very weak field strengths. Proceed as follows:
• Switch on the measuring device.
• Position and fasten the measuring device to the intended measuring point.
• Press and hold the ZERO button (1) for approx. 2 seconds until the display is zeroed. As soon as the value '0'
appears on the LC display (3) and you can see the zero display, take your finger off the button. A beep confirms this
process. Active zero calibration has been carried out.
• The measurements can now be carried out.
• To switch off zero adjustment, press and hold the ZERO button (1) for approx. 2 seconds. The '0' display goes out
and the value '0' changes, if necessary. The display value again represents the influences of the ambient magnetic
field. A beep confirms that zero adjustment has been switched off.
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