[time-nuts] HP5334B with 10544 OCXO
phill.r1 at btinternet.com
Mon Jan 30 16:39:42 EST 2012
By chance I have just today installed a recently acquired 10554 OCXO into my
HP 5334B Counter. Its has been running for 5 hours and is yet to
stabilize - my Manual suggest that 24 hours is the required time. Despite
reading the manual, I cannot see any reference to the change over from the
"low grade" inbuilt oscillator - is this automatic or does it require a
jumper alteration. I seem to recall that Rick Karlquist referred to a
voltage "droop" in the PSU occurring, due to the additional load of the oven
as a consequence of fitting the OCXO to the 5334B. I assume that this is
when the oven is taking maximum current - perhaps he will offer some help
(again) as I cannot find his earlier comments ? I note that the rear
"simple" oscillators trimmer is still operative - should this be so ?, or is
it indicative to a need to disconnect it ?
Again, any comments would be appreciated.
From: "Allwright, Mark" <Mark_Allwright at kindermorgan.com>
Sent: Monday, January 30, 2012 4:02 PM
To: <time-nuts at febo.com>
Subject: [time-nuts] HP5334B with 10544 OCXO
> 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.
> Mark Allwright
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