I'm using the 6th edition of CISPR22 (2008)
Clause 5 clearly states that tables 3 and 4 are for telecommunication ports.
There is no limit mentioned for power lines using voltage or current clamps.
The following clause is pretty clear about using an (AMN) or otherwise referred
to as LISN for power line tests.
9.3 Artificial mains network (AMN)
An AMN is required to provide a defined impedance at high frequencies across
the power feed at the point of measurement of terminal voltage, and also to
provide isolation of the circuit under test from the ambient noise on the power
lines. A network with a nominal impedance (50 Ω/50 μH or 50 Ω/50 μH + 5 Ω) as
defined in 4.3 of CISPR 16-1-2 shall be utilized.
I agree CISPR 16 and 22 do not agree with each other but we must follow the
standard with the test limits we are following.
Thanks,
Tim
In a message dated 8/31/2010 12:23:40 A.M. Pacific Daylight Time,
[email protected] writes:
CISPR 22 contains a wealth of methods for this.
The V network (LISN) for AC and DC supply
The CDN method
The ISN method
The 150 Resistor method
Current probe + capacitive voltage probe
All are described in Annex C (normative) and while they are
mentioned in the main text for telecom measurements,
the methods are well applicable to any connection port.
Well, if we think that the mains should be tested with a LISN or AMN,
but
the standard says nothing about DC power supplies, does it ?
Strictly spoken it does not actually state that the mains port
should be tested using a AMN or LISN too. It’s all assumed.( par 9.2)
If you read Clause 5, one could conclude that
current and voltage measurements to annex C are allowed for the mains
port too.
There is no prescription to use the LISN for mains measurement.
Table 3 and 4 do only refer to *other limits*
for the telecom port.
The only referral to a LISN or AMN related to the mains port is
a loose sentence in 9.4 :
“A mains port is connected, via its mains cord (!!?!) , to an AMN.”
it does not say the measurement shall use the AMN or LISN too.
Well that is the overall problem with CISPR 22. It’s a mess.
All requirements are “circumstantial” (free after “circumstantial
evidence”)
And I do not even mention the lack of coordination between
CISPR16 and CISPR22 , it seems as if their respective committees never
even read their products.
(Paragraphs and citations from CISPR 22 ed 3 and 4)
Regards,
Ing. Gert Gremmen
[email protected] <mailto:[email protected]>
www.cetest.nl <mip://01dfb890/www.cetest.nl>
Kiotoweg 363
3047 BG Rotterdam
T 31(0)104152426
F 31(0)104154953
Before printing, think about the environment.
Van: [email protected] [mailto:[email protected]] Namens Honkala, Ari
(Espoo)
Verzonden: Tuesday, August 31, 2010 7:33 AM
Aan: [email protected]
Onderwerp: RE: Alternative Conducted EMI method for CISPR 22
Hi,
If the problem is that EUT does not start due to series inductance, you
may try to use LISN in parallel, as a voltage probe. The principle is explained
in CISPR 16-2-1 Annex A.5
Ari Honkala
SGS Fimko Oy
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: 31. elokuuta 2010 1:20
To: [email protected]
Subject: Alternative Conducted EMI method for CISPR 22
Hello Group,
Does anyone know if there is an alternative conducted EMI power line
measurement method for CISPR 22? I'm having trouble testing a DC powered unit
with a traditional CISPR 16 LISN. Someone mentioned that a current measurement
can be made on power lines using a current clamp instead.
I could not find anything about measuring power lines with a current
clamp. What limits would be used? The only reference to current clamp
measurements in CISPR 22 is for telecommunication ports.
I know ANSI C63.4 mentions you can make measurements using a current
clamp, however CISPR 22 does not. Any information would be helpful.
Thanks,
Tim Pierce
TAP Engineering, LLC.
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