I don't think I'd go back to that test house! What the technician did was
both wrong and potentially dangerous. The closest test method to this that
I know of was under the old VDE 0871 regulation in which a 50 ohm-50
microhenry network was inserted into the protective earth to "lift" the
lead at conducted emissions frequencies.
Regards,
Brent DeWitt
"Boris Yost"
<[email protected] To: "Emc-Pstc@Majordomo.
Ieee. Org" <[email protected]>
om> cc:
Sent by: Subject: Conducted
emissions--green wire?
owner-emc-pstc@majordom
o.ieee.org
14-07-03 11:02 AM
Please respond to
"Boris Yost"
Dear Listers:
I recently watched a conducted emissions test. Said test technician
connected Line to a LISN, Neutral to a LISN, and ground got stuck in a
piece
of foam to keep it from touching anything. This bothered me and I
questioned this. However, according to said test technician, that is what
they are supposed to do.
The LISN's and the EUT were put on a metal table surface. The LISN's
were
well strapped down, but my thing was just sitting there. Doesn't this mean
that the impedance of the EUT is some random number depending on the
materials and surface finishes of the table, EUT, and where they put the
LISN's? The stand I used for the EUT isn't really part of the EUT, just
something I had to hold it up. What happens when somebody else mounts a
display on a furniture lift and puts it in a piece of wooden furniture?
Boris
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