Seeing Glenn's posting, I was reminded of something one of our engineering
managers showed me a few weeks back. Techs were looking for a short, and
he got something he called "thermal paper" - not that for one of those old
printers. It was a sheet, maybe 40x45 cm, that he just draped loosely over
the board. It could not have taken 5 seconds for the hot spot to light up
on that "paper".
Anyone wants to know more, please advise. Lou Hart QA Mgr Compunetix
-----Original Message-----
From: Pelkey, Glenn [SMTP:[log in to unmask]]
Sent: Wednesday, April 11, 2001 12:51 PM
To: [log in to unmask]
Subject: Re: [TN] Caps shorting on bottomside after wave...
Hi all,
We just recently picked up another tool called a "Short Sniffer."
It forces a small amount of current through the short, then you use a wand
to scan the surface of the board. A variable pitch tone is heard when the
wand is over the current path. The wand is also directional...when you
rotate it 90 degrees, it goes away. Useful in determining direction the
current travels. The disadvantages are you can't detect layer to layer
shorts very well and large planes disperse the current. But, it does give
you the area, and on line to line shorts, the exact location.
Here's the web link: http://www.testecvw.com/
Glenn
> -----Original Message-----
> From: Crepeau, Phil [SMTP:[log in to unmask]]
> Sent: Wednesday, April 11, 2001 9:11 AM
> To: [log in to unmask]
> Subject: Re: [TN] Caps shorting on bottomside after wave...
>
> hi,
>
> i can't believe how helpful this listserv is.
>
> you all might be interested in a tool our test people use as a last
resort
> to find shorts. it's an infrared camera, and it requires liquid nitrogen
> to cool off the ir tube. basically, low current is run through the
short.
> the ir camera picks up the short in real time as it heats up the board.
> it dispays the image on a crt. the current levels are controlled so that
> no damage is done to the board. it's paid for itself many times over.
>
> phil
>
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