There is also an inexpensive instrument ( about $180US ) called "Leak 
Seeker" from Electronic Design Specialists ( www.eds-inc.com ) that does a 
very respectable job of finding the location of internal board shorts.  It 
takes a little practice to get the most out of it, but it does work.

Polar Instruments ( www.polarinstruments.com ) also makes a similar 
instrument called "ToneOhm", but it is on the 'pricey' side.



At 10:45 AM 9/27/02 +1000, you wrote:


>Run a couple of amps (from a current limited power supply) through the 
>short and
>use a 5 1/2 digit voltmeter on the millivolt range  and you can get the short
>circuit location fairly easily.
>
>
>
>
>"Jon Elson" <[EMAIL PROTECTED]> on 27/09/2002 07:43:21 AM
>
>Please respond to "Protel EDA Forum" <[EMAIL PROTECTED]>
>
>To:   "Protel EDA Forum" <[EMAIL PROTECTED]>
>cc:    (bcc: Clive Broome/sdc)
>
>Subject:  Re: [PEDA] OT - Complex boards and time to Layout?
>
>
>
>Danny Bishop wrote:
>
> > funnily enough it never happened to me, I have never found a fault on my
> > boards, and hence don't concern myself too much with the tests on basic
> > double sided.
>
>I've hardly ever had a problem on 2-sided, and they are easy to spot
>visually
>and fix in a moment.  But, major trouble deep inside a 6-layer board will
>drive you nuts!  Locating the exact point where two split planes or two
>power planes are shorted is a real bear!
>
>Jon
snip

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