[time-nuts] Oscilloquartz 2200 Clock / B-5400 Oscillator

Tom Van Baak tvb at LeapSecond.com
Wed Jan 21 08:43:52 EST 2015

Hi Adrian,

I have a working Oscilloquartz B-5400. A copy of the data sheet is at:
but I do not have a manual for it.

Did you happen to take some photos when you did the repair? I'd like to see the inside, but since mine is working I'm hesitant to open it and take a close look. Also, what is your measurement and reference, where you can measure to the low -13's?


----- Original Message ----- 
From: "Adrian" <rfnuts at arcor.de>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Tuesday, January 20, 2015 2:32 PM
Subject: [time-nuts] Oscilloquartz 2200 Clock / B-5400 Oscillator

>I ran into a nice Oscilloquartz 2200 digital clock / precision crystal
> oscillator from the early 80's that is in need of some care.
> Please let me know if you have any manuals / data sheets / catalog pages
> or other information to share.
> At the moment I'm working on the faulty power supply. Any schematics,
> also from a 2210 that appears to have the same PS would be very helpful.
> The 2200 houses a B-5400 high performance oscillator that has been
> reported here:
> http://tf.boulder.nist.gov/general/pdf/26.pdf
> Any other information, data sheets etc. would be nice.
> I tested the oscillator on an external power supply. After about a day
> of continous operation it was obviously still running in, but first ADEV
> mesurements pointed into the low E-13's.
> Unfortunetely, it stopped then drawing current, so I had to take it
> apart. Out came a nice dewar-packaged cylindrical oscillator housing.
> When I pulled it out, the heater windings unwound like an untied spring.
> That will be a challenge to get nicely rewound but should be possible.
> Any advice what glue to use for fixing them permanently on the housing
> are welcome.
> The culprit was a hermetic tantalum cap in the 10V reference circuit.
> Adrian
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list