[Noisebridge-discuss] computer PSU questions - is 5.5V normal for 5V?
d p fenn
weasel at meer.net
Mon Aug 9 12:35:12 UTC 2010
travis+ml-noisebridge at subspacefield.org writes:
> On Sun, Aug 08, 2010 at 10:01:01PM -0400, Tymm Twillman wrote:
>
>> cheap supplies &/or bad capacitors will cause regulation problems.
> but for most things, the voltages you're getting should be
> fine... though i'm assuming the tester basically has a DMM rather
> than a scope, so it's probably significantly worse -- as a
> multimeter will generally average things out a bit. A properly used
> 'scope will let you see a lot more information about just what's
> going on.
>
> I'm using a special PSU tester with digital LCD readout
i think tymm's point was that a scope gives an idea of the 'time series'
rather than being 'more accurate' (usually digital scopes run in
'connected' mode where the samples are still interpolated for display,
and i don't think that older sweep scopes can do 'points' at all).
i think you're just going to see an ac component w/ your nominally dc
signal. that should be fine for most things as long as it is w/in some
region (low and high limits matter).
\p
---
Idealism increases in direct proportion to one's distance from the
problem. - John Galsworthy
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