Carlos, I agree with you, both methods should be used to baseline a product.
Our products are plastic cased also and we had the opposite problem initially. At first we were testing to the highest voltage 8kV air, 4kV direct and the unit would pass. When stepping through the lower voltages we then found failures. Well after a little more work the unit now passes all tests not matter what the order and additionally exceeds the spec as far as voltage and # of discharges by several orders of magnitude. Best Regards, Bill Jacowleff VDO Control Systems Airpax Instruments 150 Knotter Drive Cheshire, CT 06410 Phone: 203 271-6394 FAX: 203 271-6200 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, January 18, 2000 2:14 AM To: Jacowleff, Bill Cc: '[email protected]'; [email protected] Subject: RE: EN 61000-4-2 Bill, We have found that stepping up through the test voltages can give misleading results. Our products are plastic cased, and they appear to 'charge' as the test voltages are applied. The result is a pass if 10kv (for example) is applied by stepping in 2kv steps, but a fail if 10kv is applied directly. Perhaps both methods should be used? Cheers, Carlos. Please respond to "Jacowleff, Bill" <[email protected]> To: "'[email protected]'" <[email protected]>, [email protected] cc: (bcc: Carlos A. Perkins/WIN/Effem) From: "Jacowleff, Bill" <[email protected]> on 17/01/2000 13:42 Subject: RE: EN 61000-4-2 Dear Mr. Kim Boll Jensen: Well the answer to your question is 10 discharges to each point per polarity. A few other things to consider. It is also important to step through the voltages and not skip any. Is your internal test procedure going to be used as a supporting test for a DOC or is it for a DV or PV? If it is a Design validation it is quite possible to want to exceed the specs per the standard, it all depends on what you expect to learn from this type of testing. The Design Validations I have composed for ESD have exceeded the standard specifications. Best Regards, Bill Jacowleff VDO Control Systems Airpax Instruments 150 Knotter Drive Cheshire, CT 06410 Phone: 203 271-6394 FAX: 203 271-6200 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Monday, January 17, 2000 5:41 AM To: [email protected] Subject: EN 61000-4-2 Dear all I'm writing on a internal testprocedure for our products, and have now come to EN 61000-4-2 ESD. What confuse me is that the standard (as I read it) only refere to 10 discharges at each point (and each polarity), but I have been told from several different persons that the right number is 50 at each points (but without any reference to any standard). Do anynoe know what the right number is and where I can find it Best regards, Mr. Kim Boll Jensen i-data international Denmark --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
