RE: [SI-LIST] : Plane short

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From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Mon Apr 30 2001 - 10:39:59 PDT


Mike,

I just looked at the Toneohem web site and the device description
says:

"Three or four probing operations are generally sufficient to
bring you within 2 or 3mm of the short, at which point all
four LEDs illuminate to confirm success. The fault-tracing
process is accompanied by an audio tone which rises in
frequency as the short is approached, together with a
digital display of relative distance which enables
extremely accurate shorts location. "

So there is more than just a beep.

Arpad Muranyi
Intel Corporation
================================================================

-----Original Message-----
From: Michael Nudelman [mailto:mnudelman@tellium.com]
Sent: Monday, April 30, 2001 8:10 AM
To: 'Stubbs, Jason'; si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : Plane short

Jason,

No, it is not.

It is pretty much the same as the "Squealer" or Short Finder by Wavetek. It
will just produse a beep when you encounter a short. But it will not variate
the tone to show how close to the real short you are.

I actually built a schematic that will do what I want and I consider to make
the device myself, but for that I'll have to buy a cheap logic probe,
cannibalize it, put a dual-wire probe into it, spend a day in the lab
building the schematic and ordering part (some op-amps, some 9V battery
holders, small speakers, resistors etc). And I did have that device in one
of the companies I worked for.

And it worked GREAT! Why, why did they stopped making it! Oh, woe to us, to
poor wretched engineers!

Mike.

-----Original Message-----
From: Stubbs, Jason [mailto:Jason.Stubbs@marconi.com]
Sent: Monday, April 30, 2001 10:20 AM
To: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : Plane short

Is this what you're looking for???

http://www.toneohm.com/

> -----Original Message-----
> From: Michael Nudelman [mailto:mnudelman@tellium.com]
> Sent: Monday, April 30, 2001 9:00 AM
> To: 'Bastola, Subas'; si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : Plane short
>
>
> 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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