[time-nuts] HP 106B quartz frequency standard...the story so far

[Mark Sims]

The first question to ask is how long had the unit been inactive and how long has it been powered up?  I have noticed on several 5370 counters that the oscillators took several (4-6 weeks) to stabilize after I received the units.  I am pretty sure that the units had been inactive for quite a while and were not recently removed from operation.

I had them connected to a Tbolt or cesium oscillator.  I would set them each morning to a few counts above 10 MHz.  By the next morning the reading was below 10 MHz.  It took between 4 and six weeks for the units to stop drifting.   Interestingly,  the 10544 oscillators drift much less than the 10811's  and all the oscillators drifted in the same direction.

Before doing any serious study of your 106B,  I would plug it in,  leave it on,  and let it cook for a couple of months.

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