[time-nuts] HP5334B with 10544 OCXO
randall.prentice at pscconsulting.com
Mon Jan 30 16:55:15 EST 2012
There is a section in the HP5334 Service manual on changes needed.
The oscillator uses either the internal crystal (The trimmer is connected to) or the 10811.
Basically you change a capacitor feeding from one to the other.
I could scan the appropriate pages if you need (Contact me off list).
Lower Hutt 5019
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Roy Phillips
Sent: Tuesday, 31 January 2012 10:40 a.m.
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP5334B with 10544 OCXO
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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