[time-nuts] HP5065A Rubidium question
David Scott Coburn
scotttt at optonline.net
Sun Feb 19 17:41:56 EST 2017
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!
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