Chris,
In the case you mention, setting the CD player in its normal position on a
grounded steel plate should do. The unit may end up sitting on a steel shelf
unit along with other equipment with grounded chassis. I used such a setup
at home for years.
Scott Lacey
-----Original Message-----
From: Colgan, Chris [SMTP:[email protected]]
Sent: Thursday, March 02, 2000 4:41 AM
To: [email protected]
Subject: RE: Surge Testing per EN 55024/EN61000-4-5
Let's say I'm testing a Class II double insulated CD player - no
reference
to earth. If the product were stand alone, line to earth testing
would be
pointless, at least as I see it.
It is conceivable that the CD player could be connected to a Class
I,
earthed amplifier. Through the interconnects, the chassis of the CD
player
could become grounded (there would probably horrendous hum problems
but
that's another story).
Line to earth tests are now valid but how would I set this up in the
lab? A
lead from the CD player chassis to the nearest socket outlet earth?
A lead
to the chassis of my Keytek surge tester? A thin lead, a thick
lead? I
guess the test should be representative of the real world and
repeatable.
Any suggestions?
Regards
Chris Colgan
EMC & Safety
TAG McLaren Audio Ltd
mailto:[email protected]
> -----Original Message-----
> From: Mike Hopkins [SMTP:[email protected]]
> Sent: 01 March 2000 18:32
> To: 'Jim Hulbert'; [email protected]
> Subject: RE: Surge Testing per EN 55024/EN61000-4-5
>
>
> As long as there is no other path to ground, a line to line test
would be
> all thats required, but keep in mind, if you have other I/O,
telecom,
> control lines, or anything else coming out of that plastic box,
you then
> have a potential path back to ground, and in fact, will likely
have REAL
> ground connections. For example, many television sets have two
wire power
> plugs, are in plastic cases, but if you have cable tv, the odds
are that
> coax cable is grounded. Same thing applies if there is a telecom
line
> involved -- very likely one of the telecom lines is ground. ......
>
> Mike Hopkins
> [email protected]
>
> > -----Original Message-----
> > From: Jim Hulbert [SMTP:[email protected]]
> > Sent: Wednesday, March 01, 2000 10:32 AM
> > To: [email protected]
> > Subject: Surge Testing per EN 55024/EN61000-4-5
> >
> >
> >
> >
> > Colleagues,
> >
> > EN 55024 calls for surge pulses to be applied line-to-line and
> > line-to-earth on
> > the AC mains port and line-to-ground on signal and
telecommunications
> > ports that
> > connect directly to outdoor cables. However, if my EUT is
encased in
> > plastic
> > covers and has no direct earth ground connection (class 2 power
supply),
> > is the
> > line-to-line test on the AC mains the only surge test that I
need to
> > apply? It
> > seems to me that performing a line-to-earth test on either the
AC mains
> > port or
> > on signal/telecommunications ports is not warranted since the
basic
> > standard EN
> > 61000-4-5 does not specify placing the EUT over a reference
ground
> plane.
> > With
> > no reference ground plane and no direct ground connection how
can a test
> > be
> > applied with respect to ground?
> >
> > Jim Hulbert
> > Pitney Bowes
> >
> >
> >
> > ---------
> > This message is from the IEEE EMC Society Product Safety
> > Technical Committee emc-pstc discussion list.
> >
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> > For policy questions, send mail to:
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> >
>
> -------------------------------------------
> This message is from the IEEE EMC Society Product Safety
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> To cancel your subscription, send mail to:
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For help, send mail to the list administrators:
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