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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
