I have always done this test while the unit is hot. This covers the worst situation of a dielectric breakdown immediately after some failure of the unit. Think about it, after a catastrophic failure of equipment most technicians want to know right away what happened, so they open the unit up and poke around. I've done it myself. Certain dielectric materials would exhibit a lower impedance when hot and could return to passing levels after cooling.
Darrell Locke Advanced Input Devices ---------- From: [email protected] To: [email protected] Subject: Electric Strength After Abnormals List-Post: [email protected] Date: Thursday, December 16, 1999 7:45AM Dear All, After an Abnormal Test for UL1950/EN60950, should the Electric Strength be done a) immediately after the Abnormal Test or b) after Abnormal Tesrt when unit has cooled down to room temperature c) after Abnormal Test when unit has cooled down to Normal Heating Temperature Levels. The standards are not clear! +++++++++++++++++++++++++++++++++++ RTTE Directive Seminar Renaissance Hotel, Tel-Aviv 12th January 2000. For details: http://www.itl.co.il/RTTE.htm +++++++++++++++++++++++++++++++++++ Peter Merguerian Managing Director Product Testing Division I.T.L. (Product Testing) Ltd. Hacharoshet 26, POB 211 Or Yehuda 60251, Israel Tel: 972-3-5339022 Fax: 972-3-5339019 e-mail: [email protected] website: http://www.itl.co.il --------- 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).
