Date sent: Fri, 6 Nov 1998 17:16:02 -0800 (PST)
From: Rich Nute ri...@sdd.hp.com>
To: pe...@itl.co.il
Subject: Re: Burning Card
Copies to: emc-p...@ieee.org
>
>
> Fire is a very complex phenomeon. It is complex
> because ig
Fire is a very complex phenomeon. It is complex
because ignition requires
* electrical power dissipation,
* component fault temperature exceeding the
fuel material ignition temperarture,
* electrical and thermal energy sufficient
to raise the fuel to ignition
, 1998 3:17 PM
To: emc-p...@ieee.org
Subject:Burning Card Module
Dear Members,
I am sure some of you can give me ideas on how to analyze a card
module which in four different occassions caused charring and
smoke within the equipment
Engineer, NCR Financial Solutions Group Ltd,
Dundee, Scotland.
-Original Message-
From: pe...@itl.co.il [SMTP:pe...@itl.co.il]
Sent: 05 November 1998 22:17
To: emc-p...@ieee.org
Subject: Burning Card Module
Dear Members,
I am sure some of you can give me ideas on how
...@itl.co.il [SMTP:pe...@itl.co.il]
Sent: 05 November 1998 22:17
To: emc-p...@ieee.org
Subject: Burning Card Module
Dear Members,
I am sure some of you can give me ideas on how to analyze a card
module which in four different occassions caused charring and
smoke within
pe...@itl.co.il writes:
Dear Members,
I am sure some of you can give me ideas on how to analyze a card
module which in four different occassions caused charring and
smoke within the equipment. In all cases, fire did not spread and
the charring occurred in all cases, arounf decoupling SMT
would say look at any rework with an electron
microscope. Any QA lab should be able to help.
-John
pe...@itl.co.il (Peter Merguerian) on 11/05/98 05:16:57 PM
Please respond to pe...@itl.co.il (Peter Merguerian)
To: emc-p...@ieee.org
cc:(John Loiselle/US/3Com)
Subject: Burning Card Module
(voice)
+716 241 5590 (fax)
jschan...@mdsroc.com
--
--
From: pe...@itl.co.il[SMTP:pe...@itl.co.il]
Sent: Thursday, November 05, 1998 5:16 PM
To: emc-p...@ieee.org
Subject: Burning Card Module
Dear Members,
I am sure
Don't forget that the effective voltage rating of ceramic caps is
temperature dependant -- higher T - lower V (as I recall -- I
couldn't find a reference here). If the voltage rating is too low the
problem may not show up until the unit is run at a high temp.
--
have
improved considerably in 15 years, but it might be worth checking out.
Don Umbdenstock
Sensormatic
--
From: pe...@itl.co.il[SMTP:pe...@itl.co.il]
Reply To: pe...@itl.co.il
Sent: Thursday, November 05, 1998 5:16 PM
To: emc-p...@ieee.org
Subject: Burning
Classic MLC capacitor problem. See:
www.netcentral.co.uk/satcure/dessmd2.htm
Mike Rains
Foxboro Co.
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Peter,
Excessive energy applied to the capacitors is the most likely culprit. Any
of the following might be the cause:
1) Excessive power supply ripple. Especially with tantalum capacitors,
this will exceed the voltage rating even though the apparent DC level
measured with a meter appears
, November 06, 1998 12:49 AM
To: 'pe...@itl.co.il'; emc-p...@ieee.org
Subject:RE: Burning Card Module
I have come across similar incidents, and guess that the
decoupling
capacitors have been installed with reversed polarity. The
capacitors
do not always
Thank you all who gave their inputs to the burning card module.
Many safety engineers out there believe there are no hazards
associated with power limited low voltage circuitry. As many of you
have read the various responses, even with Approved Equipment,
there is still the potential of fire
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