| From: | Cirris News <news@cirris.com> |
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| Subject: | Cable Testing at 2000 Volts |
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- Introduction of a 2000 Volt Touch 1 - What is the relationship between voltage and arc distance? From Cirris--Cable/Harness/Backplane Testing Made Easy ====== This month we focus on high voltage testing with the introduction of the 2000 Volt DC Touch 1 tester. What do higher voltages really do for you? To help take some of the mystery out of it we've created an online calculator that shows the relationship between distance and voltage in detecting arcs. If you have any questions or comments, call us at 1-800-441-9910. Best Regards, Marlin Shelley President ====== Introduction of a 2000-Volt Touch 1 Our Touch 1 tester can now be purchased with a 2000 Volt option. This tester has been popular for years at 1000 Volts with a 1500 VDC option. For a virtual demo on the Touch 1 tester go to: http://www.cirris.com/hipot/tester/touch1.html ====== What is the relationship between voltage and arc distance? We use "Dielectric Withstand Voltage" (DWV) tests to find defects in insulation between isolated conductors in a cable. Often we worry about a breakdown through air or across the surface of an insulator between two isolated conductors. This can happen for many reasons such as: · Wire damage or improper stripping that removes wire insulation exposing bare wires · Loose strands of wire at terminations · Broken plastic insulation separating pins in connectors · PCB pads or traces that are abnormally large or under etched · Shields in connector hoods or molded back-shells · Metal flakes/particles from plating in insulated areas of connectors Usually the solid insulating materials used in the assemblies have much higher Dielectric Withstand Voltages than these air-gaps created by such defects. These defects are not creating a short but might be expected to result in field failure shorts as assemblies are mechanically stressed, vibrated, or subjected to moisture. Even in small gaps, dendrites of metal are known to form on the surface of an insulator that create shorts. So how much voltage does it take to be sure air-gaps are larger than a specific distance? Or, how low must test voltage be so as not to break down a known air gap in the assembly? Many factors influence voltage breakdown so we do not have a specific and easy answer. Use this link to get a sense of the air-gap spacings you can expect based on DWV Test voltages: http://www.cirris.com/testing/voltage/arc.html ====== See us at a tradeshow near you Our next major show is Assembly Tech. Expo. Chicago, IL Sept 23-25 ====== If you missed any of our past e-newsletters, click here to retrieve them: http://www.cirris.com/support/requestnews.html --------------------------------------------------------- If you forward this email, please include the following: Copyright 2003 Cirris Systems Corp. Our website: http://www.cirris.com/index.html People at Cirris can be contacted at 1-800-441-9910 or, 1-801-973-4600. To receive your own copy of this newsletter fill out this form: http://www.cirris.com/support/requestnews.html Cirris only distributes e-mail to those who have previously indicated interest in our products. To stop receiving these newsletters please reply to this message with "stop" in the subject line. | |
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