FreeLists / si-list / [SI-LIST] Re: Fw: Re: Inexpensive TDR for short/open localizing on a PCB

[Doug Smith <doug@xxxxxxxxxx>]

Hi Pat and the group,

A trick we used at Bell Labs was to use an thermal/infared camera to 
view the board while it was being fed a controlled amount of current. 
The warm spot is makes finding the short easy. Back then the camera 
had to be filled with liquid nitrogen first, but these days I suspect 
this is not necessary and the cameras are a lot cheaper.

Doug

Patrick Jabbaz wrote:

> Another simple way of determining where the short is, is to use a ohm meter,
> well you will need an ohm meter that can read very low values, I have used
> this in the past to find Power ground planes shorts very effective, it will
> narrow down the location to about half an inch.
> 
> Patrick Jabbaz
> Ubiquiti Networks
> 495-499 Montague Expwy
> Milpitas, CA 95035
> T: (408) 942-3085
> M: (408) 621-6533
> 
> 
> 

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