Hi All, I’m Running an ISO 7637-2 Pulse 2b test, but in accordance with Section 21 of JDQ202.
There are a few differences, and one that’s perplexing me is the term Pulse cycle time in the JDQ document. Pulse 2b is rather a long pulse lasting about 2 1/2 seconds. It is simulating some of the after effects of turning off the ignition key. You would think that this is not a repetitive test, but, the term pulse cycle time could imply that this pulse should be repeated. My background would ave preferred the clearer term Pulse repetition rate, Pulse spacing or Pulse interval. The standard requires 10 pulses, same as the ISO version, but then says a Pulse cycle time of 5 seconds: the ISO version makes no reference to this. It doesn’t seem appropriate to apply the test 10 times with only 5 seconds between initiations. I can see some EUT’s not even powering up in that time. It would make sense if the term meant allow a minimum of 5 seconds to ensure a complete cycle. Repetition is then at the discretion of the tester, so different DUT behavior could be accomodated. Any insight as to what JDQ 202 means by the Pulse Cycle Time term would be appreciated. Thanks, Derek. - ---------------------------------------------------------------- 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://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
