Hi Jim,
A guideline I use for Criteria B is that the E.U.T may exhibit degradation
due to the field disturbance, but must self-recover after the field
disturbance is removed. What I have seen is that in certain power supplies
the secondary output voltage drops due to the surge, causing telco systems
to re-set. If you have to manually turn the system back on your dealing with
Criteria C. Hope this helps!
Eddie O'Toole
-----Original Message-----
From: Jim Hulbert [mailto:hulbe...@pb.com]
Sent: Wednesday, January 12, 2000 3:08 PM
To: emc-p...@ieee.org
Subject: Surge Test Performance Criterion
A product has a switched mode power supply with a current sensing circuit
that
causes the supply to shut down when a surge pulse is applied to the AC mains
in
accordance with EN61000-4-5/IEC1000-4-5. After about 10 minutes, the supply
can
be turned back on and normal operation of the product can be resumed by the
operator. Does this product conform to criterion B of the EN 50082-1 or EN
55024 standards? I believe it does because the sensing circuit is
specifically
designed to protect the product against this kind of voltage/current surge
and
the product operation is fully recoverable by the operator afterward.
However,
I would like to hear how others who do this testing would interpret this.
Jim Hulbert
Senior Engineer - EMC
Pitney Bowes
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