Buffer, A/D driver and ADC vary over time, and thus the
total offset will also vary over time.
Auto Zero deducts this total offset from the measured
signal to obtain a more accurate reading. If Auto Zero is
turned off, this total offset will not be deducted from the
measured signal.
Auto zero works in the following manner:
Internally, the DMM will periodically short the Buffer’s
Hi and Lo input to obtain a total offset. The frequency at
which the offset is obtained depends on the sample rate.
The diagram below shows how the total offset is
obtained.
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