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From: "red rover"
Subject: Re: Short Circuit Detector
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 11 Oct 2002 11:34:07 -0400
NNTP-Posting-Date: Fri, 11 Oct 2002 11:33:58 EDT
Organization: Bell Sympatico
I am currently looking at a Vcc short. I would
guessed that you would be better off measuring
from between the positive end of one
decoupling capacitor and the positive end of another?
Wouldn't that make the measurements a little easier
because they are relative?
"Nico Coesel" wrote in message
> "red rover" wrote:
> >Does anyone have link to a design for
> >short circuit detector? I recall that Bob
> >Pease had a design for one in his Analog
> >Troubleshooting book. I believe it was
> >basically a micro ohmeter with an audio
> >output and you worked your way around
> >the pcb homing in on the fault.
> >Anybody here made one? Any good success?
> I've found that most short circuits on a PCB are in power
> distribution. In case of such a short circuit I simply connect a PSU
> set at a -safe- low voltage (current limit set to 1A; depending on
> minimum trace width) to the board. By measuring the voltage accross
> the decoupling capacitors (to start with) I can determine the area
> where the short should be. The closer you get to the short circuit,
> the less voltage you measure.
> Reply to nico@nctdevpuntnl (punt=.)
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