The term is not in Electropedia, but that's IEC. I don't know if ISO
co-operates with the IEC on Electropedia, but the ISO search engine is
hopeless if you don't know the exact keyword to use. The Online Browsing
Platform is no better; it finds individual words in the search phrase
'pulse cycle time' so produces 715 hits, of which at least 714 are most
probably irrelevant. Restricting the search to 'terms and definitions'
produces no hits.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-04-19 17:10, DEREK WALTON wrote:
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.
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