I am sorry but Laura is correct.

Sincerely,  

 

Paul Reid 

Program Coordinator  

PWB Interconnect Solutions Inc. 
235 Stafford Rd., West, Unit 103 
Nepean, Ontario Canada, K2H 9C1 

613 596 4244 ext. 229  

Skype paul_reid_pwb 
[log in to unmask] 

 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: September 20, 2013 6:45 PM
To: [log in to unmask]
Subject: Re: [TN] CAF, between a signal pint and ground

Laura,
It's with shivering fingers and shaking knees I dare say against such an
authority like you.
Let me just make a very simplified calculation. Given in that branch:
max
voltage = 1 V / series resistance  ( thus also current limitation) = 1
MOhm.
Max Pd = U2/R = 1/10exp6 = 1 uW.  Not enough to char epoxy.  Sorry for
being obstinate. If I am wrong and be corrected by you, it is a honor.
I enjoy hearing from you. One of the very first American reports I read
as
newbe in soldering was written by you.

Inge


On 20 September 2013 14:34, Laura J Turbini <[log in to unmask]>
wrote:

> Inge,
> I disagree.  CAF is a conductive filament which grows from the anode
to the
> cathode.  It's growth rate is related to the voltage gradient, so in a
low
> voltage circuit you may never create CAF.  When you do create CAF and
it
> bridges the anode and the cathode, electrons flow rapidly heating up
the
> laminate causing it to char.
> Laura
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
> Sent: September-20-13 1:57 PM
> To: [log in to unmask]
> Subject: Re: [TN] CAF, between a signal pint and ground
>
> Because you got two 'YES' I say 'NO'.  (I can see many rise eyebrows.
What
> will happen now? The question was 'can there be exothermic damage?'.
My
> njet
> is based on a special condition, which you may have or not have,
namely the
> impedance of the pathway. Some circuits can have 1. Extremely low
voltage
> 2. Very high resistivity. Such a combination will not produce enough
energy
> to start a exothermic issue. Just a footnote.
>
> Inge
>
>
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