Testing Power Supplies! Re: Norsk Data Nord-10/S restoration

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue Nov 16 18:19:20 2004

> The AC setting on a voltmeter will let you know if you have too much ripp=
> le=20
> on a DC supply.

That depends very much on the voltmeter!. Most of the ones I have here
simply use a rectifier on the AC ranges so that the meter responds to
either the peak or the mean of the absolute value of the input signal,
with a suitable scalling correciton so the actual reading is the RMS
value assuming a sine wave input.

They will quite happily indicate (and mis-read the value of, of course) a
DC input when set to AC,.

-tony
Received on Tue Nov 16 2004 - 18:19:20 GMT