Olin Lathrop wrote:
> N. T. wrote:
>> VG wrote: "The output from my ECG (instrumentation amplifier) has
>> somewhat of a DC bias to it." I believe he meant that the mean value
>> of the output waveform is not close enough to 0. The reason, I think,
>> is input offset voltage and temperature drift.
>
> Probably not, although it would help if the OP would quantify the symptom=
s
> he is seeing. =A0I thought the leads were picking up a DC offset, probabl=
y due
> to galvanic action. =A0That is likely to be many times more than the diff=
 amp
> input offset times the gain.
>
> In any case, high pass filtering would take care of the problem.

Waving a dead fish under the right phase of the Moon would help better :-)
If "leads were picking up a DC offset, probably due to galvanic
action", the right approach, in my opinion, would be to eliminate
"picking up a DC offset".

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