Three things to keep in mind with the 61000-4-6 Conducted Immunity test when using clamps;
1. There two types of clamps; The Current Clamp which must be grounded via the BNC connector and a short strap to the Reference Ground Plane, and The EM clamp which most commercially available models have grounding pads on the bottom which touches the Reference ground plane; so with these the ground strap is not needed. 2. The entire Test Setup must not be directly grounded to Earth or the Ground Reference Plane. The entire EUT is slightly floating off of ground through the impedance created by the CDNs and placed on 10cm platforms above the GRP. 3. There must always be at least TWO coupling devices in the test setup (see reason below). You must provide a loop or return path for the energy you are injecting. If you are testing an EUT with no I/O and only one port with a CDN attached, then you must add a second CDN (CDN-M1) to the chassis ground of the EUT to the Ground Plane. If the EUT has a dedicated ground earth terminal, you can connect a CDN-M1 from it to the Ground Plane. If the EUT does not have a ground (Class 2 device or all plastic chassis) then you can wrap the EUT in aluminum foil and connect it to the ground plane via a CDN-M1. The only setup picture in the standard that really shows this configuration in Figure F.2. Note without the CDN-M1 the EUT would only have one CDN attached. Like I said before; you must have at least two CDN devices in the test setup. It would be most difficult to do in an In-Situ setup for the 4-6 test. If you cannot keep the EUT from shorting directly to ground, either directly or through one of the EUTs, then you cannot do the test. The Standard does not give a test setup for in-situ testing. See section 7.7 when using a clamp where you cannot met the common mode impedance requirements: “When using clamp injection, and the common mode impedance requirements cannot be met at the AE side, it is necessary that the common mode impedance of the AE be less than or equal to the common mode impedance of the EUT port being tested. If not, measures shall be taken (e.g. by using a CDN-M1 or 150 resistor from the AE to ground) at the AE port to satisfy this condition and to prevent resonances” I hope this was helpful. The Other Brian From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Wednesday, November 09, 2016 10:14 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Bulk Current Injection Are you using the 2013 edition of IEC 61000-4-6? It's certainly a bit confusing. Figure 5 shows the strap without any qualification about its use, but Figure 14 says 'if needed'. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. From: David [mailto:000000fdec74198b-dmarc-requ...@ieee.org] Sent: Thursday, November 10, 2016 12:14 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Bulk Current Injection All, I’m trying to learn more about Bulk current injection. I’ve read Javor’s Field to Wire Coupling papers, as well as -4-6, ISO 11452-4, SAE J1113-4, and CS114. I’m primarily interested in grounding, and the differences between -4-6 and the rest. -4-6 requires that the injection probe or clamp is grounded with a short ground strap. MIL STD, ISO, and SAE don’t do so. I would assume it’s due to the difference between a test simulating commercial AC powered equipment versus vehicle mounted equipment. I’d like a more thorough understanding of why. Also, if I do not ground the BCI probe during -4-6, say during an in situ test on an elevated cable, what would the result be? An under test, over test, or unknown? For large equipment would it make sense to tie it to the chassis? David - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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