There is a 'reference ground plane' for the whole set-up and a local
'reference plane' for the adapter. See for example, Figures A.3 and
A.5. For me, Fig. 8e is correct and Fig. 9c is not correct, probably
just a drafting error. Clearly, the 100 ohm resistor sets up the '150
ohm environment' for the EUT port, and the reference plane should be in
the '50 ohm environment' of the measuring instrument.
The IEC web site for SC77B lists a corrigendum but it doesn't show in
the web store. The Convener of WG10 is John Maas of USNC, so someone
here may know him.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-12-29 23:12, DEREK WALTON wrote:
Hi Bart,
Thanks for the reply, but I think I have to disagree. The vertical bracket is the
reference plane is it not?, as opposed to the ground plane under the set-up. And I
interpret Figure 8e to clearly show the series element on the “ EUT " side of
that bracket.
I think we agree, these are mainly used when level setting for the CDN’s, but
also used when characterizing the EM Clamp too.
I‘m looking at the EN version issue in 2015, I’m sure they are the same.
Thanks,
Derek.
On Dec 29, 2018, at 2:41 PM, Bart De Geeter <[email protected]> wrote:
Hi Derek,
According to me Fig 8e is just a construction sample of a 150 Ohm to 50Ohm
adapter. (An L-shaped metallic bracket). This bracket is put on top of the
reference plane. (But this reference plane is not drawn in this picture).
Typically this adapters are used when performing the 'reference calibrations'
and they are always on top of the reference plane.
(P.S. I looked to the pictures of the 2013 version of the standard)
Greetings,
Bart
-----Oorspronkelijk bericht-----
Van: DEREK WALTON <[email protected]>
Verzonden: zaterdag 29 december 2018 19:59
Aan: [email protected]
Onderwerp: [PSES] EN61000-4-6 adapters
Good day folks,
I’m re-educating myself on EN61000-4-6 and looking at the section discussing
150 Ohm to 50 Ohm adaptors I am curious why the series 100 Ohm resistor is
added on the “Outside” of the reference plane for the EM Clamp and on the
“Inside” of the reference plane for the CDN. For example, Figure 8e Vs Figure
9c ( these two figures appear conflicting ) Vs Figures A 9/A 10
Can anyone enlighten me as to why this was done please.
A Happy New Year to all!
Cheers,
Derek.
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