I have no definite answer either but a few suggestions….
* To prevent RF current to flow away (re-radiate) from the test setup
though the capacitance between cable and clamp. Necessary of the generator is
"remote".
* The opposite: get rid of common mode voltages on the generator
(=amplifier) output that might couple in on the cable under test
There is probably not a real reason, but the decision was part of was thought
to be good craftsmanship.
Regards,
Ing. Gert Gremmen
Approvals manager
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From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Friday 11 November 2016 04:28
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Bulk Current Injection
Does anyone on this forum know why the current injection clamp must be
grounded? I can’t think of a reason for that.
Ken Javor
Phone: (256) 650-5261
________________________________________
From: "Kunde, Brian" <brian_ku...@lecotc.com>
Reply-To: "Kunde, Brian" <brian_ku...@lecotc.com>
Date: Thu, 10 Nov 2016 15:22:39 +0000
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Conversation: [PSES] Bulk Current Injection
Subject: Re: [PSES] Bulk Current Injection
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
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
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