[time-nuts] HP 55300A

Richard (Rick) Karlquist richard at karlquist.com
Wed Nov 23 17:43:26 EST 2016

When I was testing the E1938A I used to run the environmental
test chamber up to 85 degrees C, let the unit stabilize for
a while, and then dump liquid nitrogen into the chamber
to go to -55 degrees C in something like 2 minutes.  The
temperature inside the crystal oven fluctuated maybe a millidegree
and the frequency fluctuated maybe 5 parts in 10^-12 during
this event.  IE, you don't need to worry about a fan blowing
on your OCXO, if it is any good.


On 11/20/2016 6:41 AM, Gary Neilson wrote:
> I recently got a HP55300A on ebay for parts. It works fine but runs on 48V.
> I am going  to install a AC supply inside and also place a fan on the
> top for cooling.
> I hope the air flow will not cool the OCXO too much.
> I am also looking for documentation. I have the User manual but am
> looking for the Programming Manual.
> Thanks
> Gary Neilson
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