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 > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________