I'm sorry I disagree with Mike's assessment. To take that argument to it's logical conclusion would mean that I have to test the AC side at the same time as I did my I/O. I've been told before by a couple of test houses in the UK that all the cables at once is not acceptable according to UKAS (UK test house accreditation agency). In section 6.3 of the standard paragraph 5 says " The clamp itself shall be closed as much as possible to provide maximum coupling capacitance between the cable and the clamp" (no plurals there). This test is difficult enough to reproduce this test from set up to set up without introducing the uncertainties of how a bundle of cables was arranged in the clamp.
Regards, Kevin Harris Manager, Approval Services Digital Security Controls 1645 Flint Road Downsview, Ontario CANADA M3J 2J6 Tel +1 416 665 8460 Ext. 378 Fax +1 416 665 7753 email: [email protected] > -----Original Message----- > From: Mike Hopkins [SMTP:[email protected]] > Sent: Monday, December 14, 1998 3:34 PM > To: 'Collins, Erik D.'; 'emc-pstc list server' > Subject: RE: EN 61000-4-4 > > Place all cables in the clamp together........ I agree the standard is > not > clear, but the intent was always that all the I/O cables be placed in > the > clamp together. > > The idea is to simulate transients being coupled between lines in > cable > trays, especially where noisey ac lines are run near or adjecent to > I/O > lines. It's not likely the signals would be coupled to one line and > not to > another; in fact, because of the very fast pulses, everything gets > very well > coupled very quickly. > > Mike Hopkins > [email protected] > > > -----Original Message----- > > From: Collins, Erik D. [SMTP:[email protected]] > > Sent: Monday, December 14, 1998 10:40 AM > > To: 'emc-pstc list server' > > Subject: EN 61000-4-4 > > > > When performing EFT/B on signal and control lines using the > capacitive > > coupling clamp, should you: > > > > 1. Place all cables in the clamp together > > 2. Place all cables in the clamp independently > > 3. Both > > > > Thanks > > Erik D. Collins > > EMI/EMC Approvals Engineer > > LXE Inc. > > Phone 770-447-4224 x3240 > > Fax 770-447-6928 > > > > Check out our website @: > > http://www.lxe.com > > > > --------- > > This message is coming from the emc-pstc discussion list. > > To cancel your subscription, send mail to [email protected] > > with the single line: "unsubscribe emc-pstc" (without the > > quotes). For help, send mail to [email protected], > > [email protected], [email protected], or > > [email protected] (the list administrators). > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
