[time-nuts] Power supply help

Joseph Gray jgray at zianet.com
Mon Aug 10 00:43:55 UTC 2009


Thanks a lot for finding this. I did a search of that page for
"supply" but didn't turn this up. That is indeed the model series that
I have.

On Sun, Aug 9, 2009 at 4:29 PM, Bruce
Griffiths<bruce.griffiths at xtra.co.nz> wrote:
> 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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>
>
>
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