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d)
Measuring AC magnetic fields (changing)
AC magnetic fields occur in AC coils such as transformers. The magnetic field lines change direction. The measuring
device can measure AC fields from 50 Hz to 60 Hz. Proceeds as follows for AC measurement:
• Switch on the measuring device.
• Press the
MODE - DC AC
button (7) to switch through the measurement settings and resolutions. Each further
press of the button switches one step further in the loop. Measuring mode for the AC fields is indicated with the
display symbol ‘AC’.
•
Measurement settings c1 (resolution 0.1) and d1 (resolution 0.01) (see the figure below) are used for measurement
of AC magnetic fields in unit mT.
•
Measurement settings c2 (resolution 1) and d2 (resolution 0.1) (see the figure below) are used for measurement of
AC magnetic fields in unit G.
One of the two sequences indicated below is switched according to the unit selected. Switch the unit of
measurement to select the other unit of measurement and therefore the other sequence. See Section ‘c)
Selecting the unit of measurement’.
• Place the sensor with sensor head (16) on the object to be measured. The sensor head must touch the object.
•
The measured value is displayed on the LC display (3) without the polarity (N/S) of the field. The symbol ‘AC’
indicates measurement in AC field mode. In AC magnetic fields, the polarity constantly changes.
•
After you finish measuring, always switch off the measuring device.
If the measurement range is exceeded upwards or downwards, ‘OL’ is shown on the LC display (3).
