Randall
Thank you for your info. - I have now had time to check my manual and there
is a section that deals with a "customer" installed OCXO. I intend doing the
simple mod. today. Some months ago I obtained a 5328A for my collection of
HP counters, and I was very surprised at its quick and accurate oven (10544)
operation.
Regards
Roy
-----Original Message-----
From: Dave M
Sent: Tuesday, January 31, 2012 12:01 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] HP5334B with 10544 OCXO
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).
Regards
Randall Prentice
Stokes Valley
Lower Hutt 5019
New Zealand
ZL2RJP
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@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
Mark
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.
Regards
Roy
Installation of Option 010 is basically removing capacitor C8 and
reinstalling it into the holes designated for C100. Install the 10544
oscillator into the receptacle, secure with appropriate screws and you're
all set. C8 and C100 are located very close to the standard (low-stability)
crystal at the rear of the main board.
Dave M
A woman has the last word in any argument. Anything a man says after that is
the beginning of a new argument.
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