I read in !emc-pstc that Gordon,Ian ian.gor...@bocedwards.com wrote
(in E1BA0362B28ED211A1E80008C71EA3060206FDB3@z-
160-100-30-252.est.ibm.com) about 'Measurement uncertainties for
voltage measurement' on Wed, 24 Sep 2003:
All measurements are less than 15V DC.
How much less and to how many
Ian,
I am assuming you are connecting the reference source to the calibrated meter
and to the meter to be calibrated (DUT). I am also assuming that the reference
is a variable voltage source covering the range you need to calibrate. Draw a
diagram of the system and there and list the parts and
Hi
Someone on the list was asking a week or so ago about an ethernet
transformer that meets the 60950 basic insulation requirements.
Forgive me, my brain is little and I forgot who. I have the
information on the part, so whoever it was, please email me and I will
send it
Everyone,
This may seem to be a little out of the groups remit but someone may have
had experience of this.
I am trying to determine the measurement uncertainty associated with
calibrating an instrument which is essentially a voltmeter. This is done
using a reference voltage source and a second,
Why not build an unregulated linear power supply out of parts from Radio
Shack? Or buy a cheap 12 Volt lead-acid battery 1 or 2 Amp trickle charger
and put a filter cap on the output.
As long as it is unregulated, it should not respond in any anomalous fashion
to EMI.
From: Chris Chileshe
Hi Reg -
60950, in its various forms, is the safety standard for Information Technology
Equipment. IEC 60950 = 'root' standard. UL60950 = IEC 60950 + US / Canadian
national differences. EN 60950 = IEC 60950 + national deviations of all
EU/EFTA countries.
IEC 60529 is a standard for determining
I read in !emc-pstc that Chris Chileshe chris.chile...@ultronics.com
wrote (in 01c3827e.ebde2400.chris.chile...@ultronics.com) about 'DC
PSU for conducted immunity testing to EN61000-4-6' on Wed, 24 Sep 2003:
Question 1: Is anyone aware of a power supply suitable for this type of
testing? The
Group,
Thank you all for the information.
I got it !
RH
From: Sam Davis [mailto:sda...@ptitest.com]
Sent: Wednesday, September 24, 2003 10:24 AM
To: Reginald Henry; emc-p...@majordomo.ieee.org
Subject: RE: Safety Standards Comparison
60950 (IEC or EN) is a safety standard for Information
60950 (IEC or EN) is a safety standard for Information Technology Equipment
(ITE). It is the standard for evaluation of a piece of ITE equipment for
electric shock, energy hazards, fire hazards, radiation hazards, chemical
hazards, and mechanical hazards.
60529 (IEC or EN) is the ingress
Hi Miquel,
Basically you can use the self-certification route with
all
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Miguel Abrahams
Sent: Wednesday, September 24, 2003 2:35 PM
To: emc-p...@majordomo.ieee.org
Subject: generic standards and
Hi Miguel
Yes, all standards listed in the OJ list of
harmonized standards qualify for self certification.
That includes all generic standards.
You may download a list on many sites among ours.
Self certification also includes signing a liability
declaration and of course is no easy way to
Reg -
60950 is a product safety standard for ITE
60529 is an ingress protection reference standard for
outdoor use equipment/enclosures
Regards,
Peter L. Tarver, PE
Product Safety Manager
Homologation Services
Sanmina-SCI Corp.
San Jose, CA
peter.tar...@sanmina-sci.com
From: Reginald
Group,
SAFETY: EN60950 vs. IEC60529 (Taiwan ) standard.
Has anyone here worked with these two standards enough to give me the
basic differences and similarities between the two ?
Thanks in advance
Reg Henry
This message is from the IEEE EMC Society Product Safety
Technical
Group
After reading Ray's reply, I realise I had written LISN instead
of CDN. Kindly replace LISN with CDN in my original posting.
Rgds
From: r...@rpgarner.freeserve.co.uk [SMTP:r...@rpgarner.freeserve.co.uk]
Sent: Wednesday, September 24, 2003 1:39 PM
To: Chris Chileshe;
Chris,
I would suggest you need to change your test house. A good test house would
already have power supplies available fed via filters to the test bench. They
would also have ambient measurement information available to proof that their
power supply was suitable for testing. I am also
Hello group,
When you are testing according to generic standards, can the
self-certification route be taken, or does a competent bodies needs to be
involved?
Thanks,
Miguel Abrahams
CAE Inc.
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion
Hi Chris,
The power supply definitely should be decoupled by a standard CDN (f.a.
CDN-T2)
in order to couple the RF current from the calmp to ground.
Then any standard power supply will probably do the job.
This is exactly one of the major drawback (apart from needing higher power
amps)
that
Group,
I'm looking for your opinion on telecommunication requirements for the
following countries. Specifically, this is in reference to the following types
of telecom gear: -48VDC, No PSTN connection, normally found in Central
Office locations
As this information seems to be vague or
I read in !emc-pstc that Lothar Schmidt lothar.schm...@cetecomusa.com
wrote (in 5EFB06767D7DD211828C0008C74CE95BEB7C68@calvin) about '' on
Tue, 23 Sep 2003:
The standard is not harmonized yet, but recently published.
ALL ENs are identical in all CENELEC countries, which is the real,
original
Fellow Listers,
Many thanks to all those that responded to my query on arcing and sparking.
I now have a much better appreciation of the difference. All of your
answers will be passed to the original design review team from whence the
query came.
Cheers
Jim
__
Jim
Group,
After quite a struggle to get a product through conducted immunity
tests (clamp method), I finally discovered that the weak link in the
chain was in fact my laboratory power supply which I have been
taking along with me to a nearby test house.
The problem remained undetected for a
I am not into 3-phase but from my long ago college days I would see no
reason for the star to star not being correct and I guess that the
critical factor is the star isolating transformer. I would also agree
with your transforms for different voltages / frequencies. You don't say
which of the
Reminder:
Ken Thomas ktho...@productsafetyinc.com
08/15/2003 15:26
To: list
Subject: Chicago PSTC Meeting Announcement
Please see the attached for information on our next meeting. Guests
are welcome. Please ask any guest to RSVP so that we can make sure
we have enough seats and
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