Chris, I wasn't real clear on what was "breaking" during your hipot test. However, these comments might help: 1) Be sure you are hipot testing with a DC test voltage. AC testing can damage your Y capacitors. DC test voltage = peak of AC test voltage = 1.414 x AC test voltage. 2) If your product incorporates a surge protector (i.e. MOV), you are permitted to remove the device or lift one leg so that it is not in the circuit during the test. 3) Waiving the test is usually not an option with the Certification lab. However, adjusting the test to prevent damage (such as removing the MOV) is typically permitted.
If these don't solve your problem, provide more details on the damage & perhaps I/someone can provide additional input. Regards, Bill Bisenius E.D.& D. bi...@productsafet.com -----Original Message----- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Thursday, August 28, 2003 11:45 AM To: EMC-PSTC Internet Forum Subject: Hi-Pot testing All, We have a product that runs from AC power. During safety testing at the lab, the unit passes HiPot testing. However, the unit is broken by the testing. Rigorously, the unit "passes" its type testing because it doesn't become unsafe by the Hipot. However, it isn't functional after the test; and it requires repair. The unit does meet surge test requirements. (EN 61000-4-5, Class II). The unit has surge protection circuitry installed from line to earth (MOV in line with a gas tube). This surge protection is disabled before the hipot test. So, here are a few of my random thoughts on this process. 1. I can't break every unit by hipot testing it before I ship it. 2. When the unit is in the field, it will have the surge protection installed, which will essentially limit any "real life hipot" voltages to about 500V (230V gas tube, 275VAC MOV). In real life, the unit would experience a maximum 500V hipot. However, in the case of a single fault (surge protection disabled), the unit could experience higher hipot voltages, which would cause damage, but not an unsafe condition (as shown by type testing). 3. The surge protection is not easily removed for hipot and then reinstalled after hipot. So...are there any alternative test or inspection methods that can be used on this product? Thanks in advance, Chris Maxwell | Design Engineer - Instruments Group email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
