Re: Detecting minor voltage drops on a 50V source


JeffM wrote:
> nina.p20 multiposted to sci.electronics.basics and
> sci.electronics.design
> > I'm trying to ...detect a minor drop from a 50V source.
>
> Each time you post, you post INDIVIDUALLY to multiple groups.
> http://groups.google.com/groups?filter=0&enc_author=93_LwBIAAAC31ZfmquMYCHToGg-vWsrD8rhlH0Pnl47z4AZhN98BFg&scoring=d
>
> This is called Multi-posting and is frowned on.
> .
> .
> If you would put the name of EVERY group
> in which you would like your question to appear
> on the To: line (the Groups: line) the FIRST time you post,
> you won't have to post it a 2nd time.
> http://groups.google.com/group/sci.electronics.design/post?inreplyto=f245cf87e3b0f0eb
> That is called Cross-posting.
>
> Everyone who reads the question will see ALL the responses
> and will know that the proper answer
> has already been given in another group
> (or a bogus solution has been offered and needs correcting).

I'm no expert on Usenetiquette but I was always under the impression
that it's cross-posting that's frowned upon, and that it's better to
post to each group individually.

As to the OP's questions, detecting a 10uV difference would be
difficult but not impossible. One of the high-precision, low-drift
opamps running from a regulated power supply, with perhaps a
temperature-controlled environment should be able to do it.

And yes, as already stated by another poster, measuring a voltage
higher than the power supply is very simple with a resistor divider.
E.g., to measure 50V, use a 10:1 divider to step it down to 5V.

.

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