[time-nuts] Fwd: HP 53131A Power Off Mod

Wayne Holder wayne.holder at gmail.com
Fri May 18 19:56:52 EDT 2018

The PCBs and Parts arrived and, after putting everything together and
testing it, it all seems to work fine.  And, to document everything, I've
put up a web page at my web site that describes the mod and how to
implement it:


I had two spare board sets left.  One is claimed, but if someone would like
the other set, send me your address and I'll send them your way.


On Mon, May 7, 2018 at 10:27 PM, Tim Tuck <timt at skybase.net> wrote:

> Hi Wayne,
> Congrats on a nice simple mod !
> I have both a 53131 and 181 in need of these :)
> Can you share the gerbers for your PCBs and then I can cut them out on my
> mill.
> I could probably make a few for any interested Australians, to save on
> cross pond postage.
> thanks
> Tim
> On 8/05/2018 9:08 AM, Wayne Holder wrote:
>> I recently purchased a surplus HP 53131A and was surprised to see that
>> it's
>> designed to stay partially powered on, with the fan running, even when the
>> power switch is in standby.  The manual says this is for timebase
>> temperature stability but, since I plan to use with my Trimble Thunderbolt
>> as the reference source, I don't really need this feature.  So, I decided
>> to see if I could change this.
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