[time-nuts] Power supply help

[Bruce Griffiths]

The list price of these was $US839 and they are fan cooled.
See HP Journal April 1975 for a description of the 62605M.

Bruce

Joseph Gray wrote:
>> A good test would be to load it down to its rated current and voltage
>> and monitor noise with a clamp on current probe ( on one lead)
>> to a low frequency spectrum analyzer
>>     
>
> I don't have a spectrum analyzer. I emailed a friend about using his.
>
>   
>> Open it up and look for tell tale signs of the original equipment
>> manufacturer, possibly on the PCB.
>>     
>
> I don't find any vendor markings on the boards that I can see. The
> main switching circuit is housed inside a metal box that would be
> difficult to take apart. The entire assembly is built into another
> metal box that has a removable top. Everything seems well shielded.
>
> I did do a test last night, using my Sony ICF-2010 shortwave receiver.
> I can't power the Sony directly from the 13.8VDC, but I did plug its
> power adapter into the same AC socket as the HP supply. With the Sony
> sitting on top of the supply, I didn't notice any noise from the
> supply on 80M-10M. I thought I heard some noise on 160M, but that band
> was so noisy that it was hard to tell.
>
> If my friend with the spectrum analyzer comes through, I'll be able to
> see some real measurements on the DC output itself.
>
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