[time-nuts] Lead acid battery noise levels

[Mike Feher]

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 

Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of David Kirkby
Sent: Thursday, July 11, 2013 10:25 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lead acid battery noise levels

On 11 July 2013 05:47, Mark Spencer <mspencer12345 at yahoo.ca> wrote:
> Eric:
>
>  http://tf.nist.gov/general/pdf/1133.pdf
>
> discusses the noise levels of various batteries.
>
> Regards
> Mark S


Sod's Law comes into play here. From a quick read of that, it seems NiCd are
best, but they are being phased out. I was told they were banned in Europe,
but I don't know if that is true. I'm pretty sure I've seen NiCd tools in
the local DIY store, so I doubt it is true.

Dave
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