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8/20 us

Merry Christmas
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ee_intern

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Reading through other posts and talking to vendors, I have seen that the Joule rating is bogus unless given a time interval. Often I see something along these lines: X amount of J per 8/20 usec. I am unsure of the 8/20usec. I am guessing it is 8 somethings per 20 microseconds. Is this still a trivial rating even with this number, or is this now a legitimate peramater in which case... what does 8/20usec mean?
 

charlie b

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Semi-Retired Electrical Engineer
Re: 8/20 us

It's the rise time of the event, in microseconds, followed by the fall time of the event, in microseconds.

Edit to add: It's a standard signal used for test and evaluation purposes, and comes from IEEE C62.41 - 1991 (Rev. of IEEE C62.41 - 1980)

[ August 08, 2005, 12:59 PM: Message edited by: charlie b ]
 
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