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

Wayne Holder wayne.holder at gmail.com
Tue May 8 15:40:20 EDT 2018

Thanks!   I plan to publish the Gerber files and make them available to fab
at OSH Park as part of an a article I'll put up on my webpage at
https://sites.google.com/site/wayneholder/ but I want to make sure
everything works as expected before I do.  I'm still waiting for parts and
the PCBs to show up and I want to make sure every things works safely, as
AC voltages are involved.  So, it make take a week, or two before I'll know
if I need to fix anything, or redo one of the PCBs.


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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