[volt-nuts] Power Designs Precision Power Supplies
dgminala at mediacombb.net
Mon Apr 23 19:40:33 UTC 2012
> From: "Marvin E. Gozum" <marvin.gozum at jefferson.edu>
> Hello all good folks:
> A little bit off topic, but this defunct company with a heyday from ~
> 1950s-1980s made very good bench linear PSU, including a line called
> 'precision power supplies', something more labeled precision voltage
> sources today. However, the precision series was capable of 0.5-4A
> A user could dial a VDC set precisely to uV levels on most voltage
> ranges, and could hold its dial setting to single digit uV for ~ >= 8
> hours, but to 100uVs over a month.
> I'm interested in anyone who can give their impression of the history
> of this company, their experience with their products, or have
> advertisements or scans of their catalog of equipment during their
I used to repair and calibrate lots of Power Designs supplies back in the
late 60s and early 70s. They were always top-notch supplies, very low noise
& ripple, and seldom failed.
For instance, the ripple/noise spec for the model 5015 was < 250uV RMS. amd
stability was 0.01% +5mV per 8 hours.
The model 2020 precision supply ripple/noise was 100uV P-P, and stability
was 0.001% + 100uV per 8 hours. Very nice supplies.
I have several of the PDI supplies in my shop, and use them often. They are
excellent supplies. I love the constant current mode on them; that feature
has saved more than one project from going up in flames.
I have a model C500 (0-100V/0.5V precision supply) that needs repair. The
reference assy is bad; haven't had time to get into it.
If you need manuals, I have PDF copies of a few models, (mainly models that
I have in my shop). Post your interests and if I have the manual, I'll send
it to you.
A woman has the last word in any argument. Anything a man says after that is
the beginning of a new argument.
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