[time-nuts] Lead acid battery noise levels

J. Forster jfor at quikus.com
Tue Jul 9 09:26:41 EDT 2013


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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