[time-nuts] 5061A ion pump P/S problem
vilgotch at bigpond.net.au
Wed Aug 20 07:00:52 EDT 2008
Thanks very much for this advice. It turned out the spare unit was quite OK
after all. It's installed as I type, and the 5061A is locked beautifully and
showing the same freq as the Z3815A GPSDO on a HP 5345 counter. A check of
the "flop" parameters shows the Cs tube is nice & healthy and all's right
with the world!!!
The unit had been running with the mode switch in the "Cs off" position for
a couple of years so the tube was well and truly pumped down. The ion
current was very close to zero. I have a Shera controller circuit built into
the unused battery compartment so most of the time it runs as a GPSDO but I
like to exercise the Cesium from time to time too.
Thanks again Corby and everyone else who suggested ways to get it going
PS: my 5345 counter does not have the GPIB option so I can't do things like
Allen plots. If anyone happens to have a junker with a GPIB card available
I'd love to hear about it.
> From: corby d dawson <cdelect at juno.com>
> Subject: Re: [time-nuts] 5061A ion pump P/S problem
> To: time-nuts at febo.com
> Message-ID: <20080819.090934.-558537.0.cdelect at juno.com>
> Content-Type: text/plain; charset=us-ascii
> You implied that you tested the spare module on the bench.
> You must connect the -side of the supply to the case of the module as
> well as the pin. (this occurs in the unit by its connection to the
> If you don't the supply floats and you will only read about 1/2 the
> voltage out.
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