[time-nuts] HP5334B with 10544 OCXO

Rick Karlquist richard at karlquist.com
Mon Jan 30 11:31:48 EST 2012

Hi Mark, I was the project manager for the 5334B counter.
A "rule" at HP was that all 10544 sockets are required to work
OK with a 10811 plugged in.  There is no rule about the
other way around, however its likely to be workable.  The 10544
was long out of production in 1987 when the 5334B was introduced
and I never worried about whether it would work.  The 10544
is slower to stabilize from a cold start because the AT cut
has thermal transients.  If you keep it warmed up all the time,
then there isn't such a disadvantage to the 10544.

Rick Karlquist N6RK

Allwright, Mark wrote:
> Hello.
> I recently bough an HP-5334B counter with option 010 from the big "E".  A
> Google search seems to indicate the OCXO should be a 10811 type OCXO but
> mine has a type 10544.
> Other than taking longer to warm up does anybody see any problems with
> this?  Basic testing shows the unit seems to work OK.  It is reading 1.7
> Hz low compared to my Thunderbolt at 10 MHz - I have not tried adjusting
> the trimmer on the 10544 yet.
> Comments and thoughts appreciated.
> Regards.
> Mark.
> --
> Mark Allwright
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