I agree with Carlos.
The standard says, "This clause gives you a guide for evaluation of the
test results........".
It also says, "The variety and diversity of equipment and systems to be
tested makes the task of establishing the effects of surges on equipment
and systems difficult".
It also says, "The test results shall be classified on the basis of the
operating conditions and the functional specifications of the equipment
under test..........".
The standards committees are smart enough to know that they cannot possibly
write descriptions of test evaluations that would cover every conceivable
piece of equipment ever designed in the past or ever to be designed in the
future, so they provided "guidelines for evaluation". If product
specifications provide different operating conditions and functional
specifications than are provided in the guidelines then testing is
evaluated to the product specifications.
========================================================
carlos.perk...@eu.effem.com on 01/13/2000 01:15:25 AM
Please respond to carlos.perk...@eu.effem.com
To: "Jim Hulbert" <hulbe...@pb.com>
cc: emc-p...@ieee.org (bcc: Robert E. Heller/US-Corporate/3M/US)
Subject: Re: Surge Test Performance Criterion
Jim,
I agree with you, on the basis that in this case, a complete shut-down is a
designed-in function of the product, and the standard says "No degradation
of
performance or loss of function is allowed below a performance level
specified
by the manfucturer". You, as the manufacturer, are specifying this 'loss
of
function'.
In my mind, all you have to do is make the end user aware that a shut-down
will
occur when a surge is detected, and you should be OK.
Cheers,
Carlos.
Please respond to "Jim Hulbert" <hulbe...@pb.com>
To: emc-p...@ieee.org
cc: (bcc: Carlos A. Perkins/WIN/Effem)
From: "Jim Hulbert" <hulbe...@pb.com> on 12/01/2000 20:08
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
---------
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes). For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).
---------
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes). For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).
---------
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes). For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).
