if the DC offset is constant I don't see any problem except you need
probably a zero crossing detection, the easyest way is maybe to
extract the AC voltage with a capacitor and to compare with gnd, but
may be any other solution ( compare directly with the offset ).

Vasile


On Wed, 12 Dec 2001, Micro Eng wrote:

> If some recall, I was looking for a current measureing device, and I found a
> relativly inexpensive unit, that is a hall effect device. Basically you
> connect up 5VDC, ground and the device under test, and you get a AC waveform
> riding on a 2.5VDC signal.  The amplitude of the DC referenced AC signal is
> supposed to vary according to the amount of current but I still need to run
> some tests since I was using a dimmer switch to vary the current, but it
> simply chops it to lower the voltage and thus the current.  Need to buy some
> various voltage light bulbs.
>
> Anyway, has anyone ever measured the AC voltage relative to the DC offset?
>
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