[time-nuts] HP5065A Rubidium question

paul swed paulswedb at gmail.com
Mon Feb 20 09:14:05 EST 2017

Scott do not know if anyone responded to you. Looks like a lot is working.
But the devil is in the details. On the lamp measure the current feeding
the lamp oscillator.
That may give you a hint thats its running. If its 15 ma then most likely
its not oscillating.
Would be good to know what tools you have available also.

On Sun, Feb 19, 2017 at 5:41 PM, David Scott Coburn <scotttt at optonline.net>

> I have an HP5065A Rubidium Frequency Standard which is not working.
> All of the oven temperatures look OK.
> The power supply voltages look OK.
> The ~60 MHz going into the RVFS package looks OK.
> The 5.000 MHz and the ~5.315 MHz signals are within a few Hz.  (The unit
> is running open loop only.)
> The A7 AC amp looks to be working OK.
> The A8 137/234 Hz signals look OK.
> There is 20 VDC feeding the RVFS lamp oscillator.
> But, there is no current coming from the photodiode.  (Maybe a few
> picoamps of dark current, certainly not the expected ~50 microamps of DC,
> and no 137/234 Hz signals).
> It seems the most likely problem is that the Rb lamp is not coming on.
> Maybe possible that the photodiode is faulty, or a broken wire, etc.
> Any other possibilities I should check before setting off into the innards
> of the RVFS package?
> Thanks in advance!
> Cheers,
> Scott
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