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When both the ANALOG OUTPUT and AUTO RANGE features are active the following condition can occur.
Suppose the present range is 3kG and the present reading is +2.8kG. The analog output will be +2.8VDC. The
signal then increases to +3.2kG, which would force an automatic change to the 30kG range setting. The analog
output will now be +0.32VDC because of the range change. This can lead to problems if the analog signal is being
used to make decisions since there is no indication that a range change has occurred. In these situations it is best
to select a fixed range that covers the expected flux density span.
The analog output signal contains both the DC and AC components of the flux density signal. This means that it will
also contain any initial DC offsets in the probe and the meter's circuitry. These offsets can be removed by the
ZERO function.
The ZERO function can also be used to introduce a DC offset if desired. This is useful when observing AC
waveforms in which one portion of the waveform is being clipped because it exceeds the 4.25VDC limit of the
meter. Using the ZERO function, the center of the waveform can be moved to reduce or eliminate the "clipping" as
depicted in the figure below.
Figure 3-21
Adjusting the DC Offset of the Analog Output
3-18
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