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An AC reading, being a true RMS value, has no polarity. However, when using the RELATIVE function in AC mode, a negative value may be
displayed. A negative AC reading means that the present reading is less than the RELATIVE value. An unsigned value means the present
reading is greater than or equal to the RELATIVE value. For example, if the original RELATIVE value was 100 mT and the present field is
80mT, the result will be -20 mT.
MORE DETAILS ON DC MODE OPERATION
It is possible for the flux density signal to contain both a DC component and an AC component. In the DC mode, this can lead to unstable
readings. If the peak value of the AC component reaches the electrical limits of the meter, even though the average DC level is within the
limits, an overrange condition may appear on the display. This situation can also lead to erratic behavior if the AUTO RANGE feature is active.
The presence of an AC signal can be verified by observing the analog output signal or by using the AC mode to determine the magnitude of
the AC component.
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