Re: Rubidium Lamp Voltage

Hi,

Thanks to the both of you for that information. In fact the
standard I have that contains the FRK-L is in good working order
and locks fine after a few minutes even though the lamp voltage
is down to 5.5. It is just that on the schematic, the EFRATOM
subassembly for the RACAL-DANA 9475 is shown as a simple block
and so far I haven't been able to run down a copy of the internal
circuit.

I have a spare surplus lamp arriving in a few days although
I've had to take it on trust that it doesn't have too many hours
on the clock. Unfortunately the mounting boss is slightly
different to mine but I hope to release the bulb from this and
get a new fitting turned-up. I am able to carry out basic
confidence checks against off-air standards and, as my
requirements are modest, the odd digit reduction in the 'n' of
'parts in 10^n' is not of concern.

As penance for my sins in a former life, I once had charge of
a calibration lab where the frequency sources were Rubidium
referenced. They were dumped when the cost of new lamps or trips
back to the manufacturer from the Middle-East became greater than
new GPS-disciplined oscillators.


Thanks - Joe


.

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