Richard Marshall Limited has made measuring equipment for the methods in
EN55103-3 Annexe B. In 2007 we designed the test hardware and calibration
hardware as in figs. B1 and B2 - which is described on our website
www.design-emc.co.uk
.
Subsequently we have made several sets of test AND CALIBRATION hardware for
the toroidal transformer test according to B.3(b) and B4, some of which have
been supplied to customers in the USA.
John Woodgate is, of course, absolutely correct in his voltage source
analysis.
We did conclude that some aspects of the design intent were not very clearly
expressed in the Standard. Specifically, referring to Fig. B4, one needs to
allow for the influence of the shunt impedance of the toroidal transformer
primary upon the characteristics of the weighting network "L, R2".
Email off-list for full documentation and quotes!
Richard Marshall
Richard Marshall Limited
30 Ox Lane, Harpenden, Herts.
AL5 4HE UK
Phone +44 (0)1582 460815 www.design-emc.co.uk
Member of the EMC Industry Association
----- Original Message -----
From: "John Woodgate" <j...@jmwa.demon.co.uk>
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Sent: Sunday, August 18, 2013 6:25 PM
Subject: Re: [PSES] DIN EN55103-2
In message <ce36590e.46a97%ken.ja...@emccompliance.com>, dated Sun, 18 Aug
2013, Ken Javor <ken.ja...@emccompliance.com> writes:
"There is the unique 200 mA test method in EN 55103-2:2009, fig. B.3b) and
B.4 which uses a "toroidal transformer" for injection beginning at 50 Hz."
Yes, 50 Hz to 10 kHz, not 150 kHz.
He then states:
"I do not like the method's uniqueness and the lack of an usual
calibration procedure."
Tough. Most EMC test methods are 'unique'.
And he goes on to say he wants a bulk cable injection technique similar to
MIL-STD-461 CS114. That's where the the thread was punted my way.
I believe the committee concerned could not find a satisfactory method of
that type.
It's not too hard to inject 200 mA into a dead short, but as stated in the
original post, there must be some way to bound the driving potential as
well. A BCI technique at low audio frequencies is non-trivial if a
potential of any magnitude must also be delivered.
I don't understand this point. There is no question of requiring an
unlimited voltage. An example is given in the text of a 100 V
audio-frequency supply, fed via a 4.5 kohm resistor to a transformer of
voltage ratio 9:1. In parallel with the primary winding is a series
network of a 6480 μH inductor and a 20.25 ohm resistor. The calibration
requirement is that a short-circuit across the primary winding carries a
current of, in this case, 22.22 mA, +0/-0.5 dB up to 10 kHz.
The *maximum* current injected is indeed 200 mA, but the actual current
depends on the impedance of the loop, of course. This is satisfactory,
because it applies also to any real-life common-mode current.
I would point out that EN 55103-2 has been in use since 1997, and the
requirement has not changed. The standard will in due course be superseded
by CISPR 35/EN55035, which you client may like even less.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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