+1 The accuracy of the hipot equipment is not relevant, as long as it is *known*. It implies just that you need to overstress your insulation with the inaccuracy of your test equipment. So if your current hipot tester is +/- 15% and your required test voltage is 1000 V +/- 1% you should carry out the test at 1150 volts, and you are sure your EUT passed the 1000 V test. At the cost of a slightly increased risk of insulation failure.
Alternately use your 0.1% DVM (you have one, don't you) to measure the exact test value and set it to 1001 (!!!) Volt before testing and verify again after testing. (it might drift with the mains voltage, so verify before *and* after) If you do not have a suitable HV probe, just make a voltage divider with 10 1% 500V resistors and calibrate it to 0.1 %. After all its 50/60 Hz, so easy to do. This method should be acceptable to your auditor, if he is metrological competent. Regards, Ing. Gert Gremmen, BSc [email protected] www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens John Cotman Verzonden: Thursday, October 06, 2011 5:57 PM Aan: [email protected] Onderwerp: RE: [PSES] hi-pot tester I have to ask: Why do you need such precision on a hi-pot test? Are you planning to make something whose insulation is so finely judged that it would pass at 100% of the test voltage, but fail at 102.5%? John C -----Original Message----- From: Brian Oconnell [mailto:[email protected]] Sent: 06 October 2011 16:18 To: [email protected] Subject: Re: [PSES] hi-pot tester Yes, thanks Tony - am so desperate that I wrote script to watch craig's list (gakk, barf). Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Anthony Thomson Sent: Thursday, October 06, 2011 1:45 AM To: [email protected] Subject: Re: [PSES] hi-pot tester Have you tried eBay? e.g. http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=hi+po t+tester Can help you out of a spot sometimes. Tony ----- Original Message ----- From: Brian Oconnell Sent: 10/05/11 04:25 PM To: [email protected] Subject: [PSES] hi-pot tester Not able to find stock for any decent hi-pot test equipment. Any reason for sudden lack of stock? Need one of following for immediate purchase (new or used): Slaughter 2945 Chroma 19703 Guardian 500VA Stuff with equivalent specs? thanks, Brian - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
