[time-nuts] hp 5245L counters with 10544 and 10811 OCXOs
Loney Duncan
loney2 at sbcglobal.net
Wed Jan 10 01:54:34 UTC 2018
Tom,
I'm very grateful for your immediate response, and all that you sent me.
The last four PDFs are exactly what I need to understand and troubleshoot
the ailing adapter board. This is my first experience with Time Nuts, and
I'm impressed.
Again, many thanks!
Loney
-----Original Message-----
From: Tom Van Baak
Sent: Monday, January 8, 2018 11:19 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] hp 5245L counters with 10544 and 10811 OCXOs
Loney,
You'll find the schematic for the 05245-60033 adapter board at the bottom
of:
http://leapsecond.com/museum/10544/
/tvb
----- Original Message -----
From: "Loney Duncan" <loney2 at sbcglobal.net>
To: <time-nuts at febo.com>
Sent: Monday, January 08, 2018 8:08 PM
Subject: [time-nuts] hp 5245L counters with 10544 and 10811 OCXOs
Gentlemen:
I have two 5245L counters which appear to have had a field mod where the
original 1 MHz cylindrical oven standard has been replaced by the 10544 and
10811 10 MHz ones. Both counters have late 4-digit serial prefixes. Both
of the standards plug into an interface circuit board that, among other
things, appears to have a divide by 10 circuit to produce a 1 MHz output to
the counter’s oscillator card as the old cylindrical oven standard did.
This card for both has an hp p/n 5245-60033.
My 10811 counter works well, but the 10544 unit has a troublesome
intermittent problem that appears to be on the board. I cannot find a
schematic and parts list for this board to troubleshoot and repair it.
These probably were on a change insert into the counter Service Manual, but
I’ve yet to find one. Have checked on Keysight’s website with no success.
Would anyone in this group possibly have these, or point me to an archive
that would? I very much would like to have the 544 unit function. I have
observed that after many decades of aging, a lot of the old original oven
standards are out of adjustment range, while my 544 and 811 OCXOs can still
be adjusted.
Thanks very much for your advice.
Loney Duncan W0GZV
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