David Kirkby wrote:
On 9 July 2013 04:52, Mark Spencer<mspencer12...@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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