[time-nuts] Lead acid battery noise levels

[Andy Bardagjy]

The SRS 560 and 570, low noise voltage and current preamplifiers
respectively, both use bog standard sealed lead acid batteries.

Andy Bardagjy
bardagjy.com


On Tue, Jul 9, 2013 at 9:26 AM, J. Forster <jfor at quikus.com> wrote:

> EG&G Princeton Applied Research made a very low noise preamp unit, the
> 113, which was pretty much the industry leader for years. It was often
> used with Lock-In amplifiers. The unit used NiCds, I believe for that,
> among other, reasons. I'd expect Ithaco and SAE have similar products.
>
> -John
>
> ===============
>
>
> > David Kirkby wrote:
> >> On 9 July 2013 04:52, Mark Spencer<mspencer12345 at yahoo.ca>  wrote:
> >>
> >>> Hello, I've just reviewed the thread from earlier this year regarding
> >>> low noise power supplies and some related information about the noise
> >>> levels of certain batteries.    Has anyone ever come across any data
> >>> pertaining to the noise levels of common gelled lead acid storage
> >>> batteries ?
> >>>
> >> Have you come across the volt-nuts list?
> >>
> >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> >>
> >> I see a bizzare review of an HP 3457A meter on utube
> >>
> >> http://www.youtube.com/watch?v=HfxpJCdgVwc
> >>
> >> where the guy determines the noise level of the 6.5/7.5 digit meter by
> >> measuring the voltage of what he describes as a "general purpose lab
> >> power supply". Is it me, or is it a bit dumb to try to "measure" the
> >> noise level of a laboratory multimeter by using a general purpose lab
> >> power supply.
> >>
> >> I must admit, I thought that using a battery would have been stable at
> >> least short term, but it seems there is noise on a battery - something
> >> I was not aware of until today.
> >>
> >> Dave
> >> _______________________________________________
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> >>
> >>
> > A battery is noisest when current is flowing in the battery.
> > With no current flow (or electrolyte disturbance) the noise is very low.
> > NIST has measured the noise of unloaded NiCd cells for example and it is
> > extremely low.
> >
> > Bruce
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> >
>
>
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