[time-nuts] Power supply help

[Bruce Griffiths]

I remembered this series from the 70's but couldn't immediately find the
article.
The required search term was "power supplies".

Joseph Gray wrote:
> 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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>>     
>
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