Locating short circuits (was Memorex 102 20MB Hard disk)

[dwight elvey]

> From: ragooman at comcast.net
> 
> Mike Loewen wrote:
> > On Wed, 14 Apr 2010, dwight elvey wrote:
> >
> >> I have a none destructive method of locating such shorts. It requires
> >> a bench power supply and a good DVM.
> >
> >    Has anyone here used an ESR meter to locate a short across the 
> > power rails?  If so, what's the technique?
> I guess you mean this
> http://www.electronicrepairguide.com/esr-meter.html
> 
> But you really want a Milli-Ohm Meter to find shorts with more precision 
> when it comes to connections with several components on there, about 0.1 
> milli-ohm resolution. That lets you pinpoint the short directly to the 
> sport on the pcb, even between the next pin on a chip. I just found a 
> place online the other week that has one for $150 from Ruby Electronics, 
> other costs 3 times as much,  but I still have to wait to get one 
> myself--other bills still have priority :)
> http://tinyurl.com/y4d7op5
> 

Hi
 It is obvious that you have never tried my method if you truly
believe that a Milli-Ohm meter is easier to find shorts than the
method I describe. I've spent many years using various techniques
to find shorts on all kinds of boards and systems.
 I've use TDRs, Milli-Ohm meters, thermal paper and even expensive
HP current probes.
 Of these, the method I describes was the simplest and cheapest method.
It requires no special equipment and is far superior to a milli-ohm meter.
The other methods I'd mentioned are superior to the milli-ohm meter
method.
Dwight


 		 	   		  
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