[SI-LIST] Re: Fw: Re: Inexpensive TDR for short/open localizing on a PCB
- From: Yafei Bi <yafei_bi@xxxxxxxxx>
- To: doug@xxxxxxxxxx, patrick@xxxxxxxx
- Date: Fri, 4 May 2007 01:01:11 -0700 (PDT)
sometimes it is called "hot spot check", or "hyper vision" or "photon
emission", or "liquid crystal"
see an example at the URL:
http://www.accurel.com/?area=service&id=11
it is routinely used in IC design to find high current spot, latch-up location
etc.
depends on the equipment vendor, it might be called on of the above names.
Thanks
Yafei
----- Original Message ----
From: Doug Smith <doug@xxxxxxxxxx>
To: patrick@xxxxxxxx
Cc: olaney@xxxxxxxx; jmartinson@xxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Sent: Thursday, May 3, 2007 10:40:01 PM
Subject: [SI-LIST] Re: Fw: Re: Inexpensive TDR for short/open localizing on a
PCB
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
>
>
>
--
-------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
========= Los Gatos, CA 95031-1457
_ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
/ /\ \ ] / /\ \ Mobile: 408-858-4528
| q-----( ) | o | Email: doug@xxxxxxxxxx
\ _ / ] \ _ / Website: http://www.dsmith.org
-------------------------------------------------------
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
____________________________________________________________________________________
We won't tell. Get more on shows you hate to love
(and love to hate): Yahoo! TV's Guilty Pleasures list.
http://tv.yahoo.com/collections/265
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
