You seem to be implying that the device manufacturers recommend/require Hi-Pot testing of these black boxes. If so, you should do it. 600V AC does not sound particularly severe and the manufacturers wouldn't be specifying such testing if they though it would degrade the devices, right?
FWIW, we have done 100% Hi-Pot testing on some of our products, in the range of 2-4kV AC, due to customer requirements, and I am not aware of any subsequent failures due to degradation (in tens of thousands of units). Joe. > -----Original Message----- > From: Torelli, Bruce [SMTP:[EMAIL PROTECTED]] > Sent: Tuesday, October 29, 2002 11:48 PM > To: Multiple recipients of list CHIPDIR-L > Subject: Dielectric Withstanding Voltage Testing (Hi-Pot Testing) > > Hi All, > > Apologies if this is off topic. > > We are evaluating the merits of Hi-Pot testing on aircraft black boxes as > part of the return to service test after a shop repair visit. > > Most of our black boxes are embedded computer applications that live on > the > avionics rack in an airplane and perform specific functions like autopilot > computer for instance. > > Some of the box manufacturers specify Hi-Pot testing as part of their > return > to service tests generally, at around 600 Volts RMS. > > We have issues with performing potentially destructive tests without > restrictions as units that come through the shop for repair. No telling > how > many times a lemon unit gets zapped. Where we are regulated, we need to > have a solid case before we argue with the device manufacturers. > > What kind of experience do commercial manufacturers have with this sort of > testing at manufacture or repair? Is it done commercially? What kinds of > things do you find? All feedback on merits / drawbacks is welcome? > > Thank you. > > > Bruce Torelli > Delta Air Lines > Sr. Avionics Engineer, Dept 556 > Atlanta, GA 30320-6001 > PH: 404 714 9508 FAX 404-714-3291 > > -- > Author: Torelli, Bruce > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Author: da Silva, Joe INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
