[time-nuts] Lead acid battery noise levels

J. Forster jfor at quikus.com
Thu Jul 11 14:15:20 EDT 2013


Yeah! In spades. And there really are no good substitutes. I have a number
of instruments from ESI, GR and others that are pretty much doorstops w/o
them.

The solution the camera people use, the silver cells, are not available in
the larger sizes for instruments AFAIK.

-John

===============




> But Hg batteries are So Moot! We're simply not allowed to have them or
> make them. Nanny won't have them in the house.
> I have a couple of Accutron clocks that would love to see a mercury cell.
>
> ed breya
>> Second attempt at emailing again:
>>
>> NiCd batteries should have the lowest noise for their size due to low
>> resistance, but if you look at ever-lower frequency, the Hg should be
>> superior since it has the most stable voltage with time and
>> temperature. Drift (including self-discharge) and temperature
>> variation response can appear as very low frequency noise independent
>> of the other noise sources and operating conditions. Hg batteries are
>> so stable that they were commonly used as voltage references or to
>> power small circuits without any additional regulation needed.
>>
>> Ed
>>
>>
>>
>>  >Mike Feher wrote:
>>
>> A long time ago, when I was concerned about a phase noise issue, I found
>> an
>> old NBS article. It was on measuring phase noise and included a
>> schematic of
>> an ultra-low noise amplifier. In that amplifier they used Mercury
>> batteries.
>> I also glanced at the referenced article, stating NiCad is the lowest
>> noise,
>> and, NiCads were available for a long time, yet they used Mercury.
>> Regards
>> - Mike
>>  >
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
>
> --
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> are as significant as experiment, for thence comes quiet to the mind."
> De Erroribus Medicorum, R. Bacon, 13th century.
> "If you don't know what it is, don't poke it."
> Ghost in the Shell
>
>
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