Dear EMC experts,

CISPR 22 (and also CISPR 16-2-1, ANSI C63.4, etc.) requires
AMN to be placed 80cm away from the EUT.
CISPR 22 now requires that direct plug-in power supply unit
to be placed on the tabletop (clause 8.3.1 c)).

To met these requirements for conducted disturbance measurements,
extension cord would be required between the AMN and the power
supply unit.

However, such extension cord would ruin the AMN's carefully
defined and validated impedance - the impedance seen from
the power supply unit might no longer met the requirements
of CISPR 16-1-2.

There are pros and cons, and I personally think it would
rather better to plug such direct plug-in power supply unit
to AMN rather than producing another problems by use of
extension cord, but maybe other people may have different
opinions.

Can anyone tell me how do you, or should we, deal with such
situation?

Regards,
Tom


Tomonori Sato  <[email protected]>
URL: http://homepage3.nifty.com/tsato/

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