RE: [SI-LIST] : Plane short

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Mon Apr 30 2001 - 05:59:50 PDT


1. Method One. If your power supply is capable of providing undervoltage
protection without pulsing (pumping more or less large constant current
through the short) - measure the voltage drop gradient and find the short.
Works for me.

2. Method Two. Using milliohmmeter and "Freeze" spray, find the place that
reacts "violently" (rapidly changing resistance) while sprayed. This is
likely (80-90%) to be the spot where short is. Also works for me.

3. There used to be a hand-held device on the market, size of a logic probe,
that produced variable tone depending on the closeness to the shorted spot.
Took me 2-3 minutes max to find the exact location (required good hearing -
I have an absolute pitch).
Problem - I've been trying to locate the device unsuccessfully for 4 years
now. Seems like they either withdrew it due to the lack of demand or I do
not know where to look.

IF ANYONE KNOW ABOUT THIS ONE PSE LET ME KNOW - WILL BE FOREVER IN YOUR
DEBT! :-))))

Mike

-----Original Message-----
From: Bastola, Subas [mailto:subas.bastola@intel.com]
Sent: Saturday, April 28, 2001 11:56 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Plane short

What is the best method to find the location of a short between the power
and gnd plane in a fully assembled board? Can TDR help?

Subas Bastola
Intel

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