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

[Ed Kelleher]

At 01:16 AM 11/16/2004, you wrote:
>I, for example, have few suitable dummy loads at hand.  I have a load
>resistor which came form an old Sun (4 ohms), though I'm not sure
>whether it's between 5V and ground or 12V and ground - it I suspect the
>latter, since it looks more like 36W than 6¼W.  (It could even be
>between 5V and 12V from what I can tell, though that would be Weird.)
>
>I actually do not even have a reliable voltmeter, much less the
>properly working oscilloscope I'd want to check things like ripple.

Old disk drives, if they'll at least spin up, make good dummy loads.
The AC setting on a voltmeter will let you know if you have too much ripple 
on a DC supply.

Ed K.