We have had the same experience with the variety of our analogue and
digital meters.
One solution can be found within the IEC 60990:99 (which is referred to
for touch-current measurements e.g. by the newest versions of the IEC 60950
and IEC 60065) and which defines measurement methods for DC
Forwarding from our local section, but it applies to all IEEE members. Jim
Forward Header_
Subject:FW: IEEE election
Author: Robert T. Haller r.t.hal...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: 10/4/00 1:14 PM
This message is sent
Please allow me to ask a relevant question only for curiosity.
We have no idea of what charge (positive or negative) would go to the DUT in
ordinary ESD.
That's why we have to test two polarities in ESD immunity test.
Lightning is a kind of ESD happened between a charged cloud and objects on
Gert et al,
[Critical comments re CEN removed in an attempt to maintain a professional
attitude.]
Can't we just recind all of these silly redundant product family standards if
they are truely just informative supplements to the Generics? I'm getting tired
of retesting and then rewriting
Ted,
Looks like you got some homework to do. The only thing I can offer is a
website link for the radio authorities in Singapore. Used to be known as
TAS, but now is the IDA. Excellent website and they are very responsive to
inquiries. When you have completed your research, perhaps you could
Group,
The EN61000-3-2 standard has always listed absolute current values for
harmonics produced in a 230-240VAC 16A line. Tests of wide-range input
units are performed in the 230-240VAC condition.
Obviously, equipment drawing much less than 16A @ 240VAC, could draw the
same harmonic currents
My interpretation of prA14 that POS systems are considered professional
equipment. To that effect, POS systems should be classified as Class A,
given that clause 5 in prA14 under the Class A section states the following
Equipment not specified in one of the three other classes shall be
considered
If anyone is curious, I have a graph of the frequency response of Annex D using
an excel spreadsheet. Contact me off-line.
Regards,
David.
David Gelfand
Regulatory Approvals
Memotec Communications Inc.
Montreal Canada
---
This message is from the IEEE
Hello all,
I'm trying to determine if my company's product, a point
of sale terminal falls under the Class D category in the soon to be in place
standard EN61000-3-2 (prA14). What is the definition of a personal computer
used in the EN61000-3-2:1995/prA14:2000 document? Is
No one is forcing anyone to use Class D. Standards are voluntary. As I
reported a few days ago, we have a product that will not pass Class D but
will pass Class A. Our Notified Body told us that they will accept prA14, so
we are submitting a TCF for that standard and using Class A..
Richard
Group,
I am beginning an investigation into requirements of
low-power transmitters/receivers outside the USA.
I am entrusting someone in this group to help shorten
the search time by providing 1)-contact persons, or
2)-information sources, or 3)-direct information.
The product: low-power
Dear Ken
In EN 60950 and UL1950 appendix D you can find a description on how to
measure leakage current and the specifications for the meter. This is taken
from another standard which I don't know the number of. If you don't use a
meter with the right data you will never know what is the right
Actually, most meters average the waveform, then apply a rote formula
converting that average to an rms reading which is more likely to err on the
side of too low a reading.
For a square wave it will read too high by 6% (actually worked this out, but
forgot the actual number, but you have the
Hello Robert,
you could check into: IEC 60926:1995 + A1:1999 Auxiliaries for lamps ?
Starting devices (other than glow starters) ? General and safety
requirements.
There is currently a proposal under development to refer to this standard
in IEC 60950 to address safety requirements for high
I remember to have contributed to this discussion before, and I have asked
this question at the time to Robert DeVre, who is actually the
EMC-consultant of the European Committee.
His opinion -close to European law- (abbreviated) :
==
Any product or product family standard that tries to exclude
Ken:
Analog meters are inherently good low pass filters and will mask any high
frequency components. The same is truefor most DMMs unless they have been
specified for higher frequencies. Typically, don't expect much accuracy
beyond 100Khz for soem of the best DMMs.
You can always use a scope
ESD is a term used for an electrical discharge that occurs from one charged
surface to another un-charged surface usually generated by frictional or
triboelectric effects. I have never heard of ESD issues within cell phones
or LCD displays. It may be possible that a person with a large
Try an internet search on electrostatic dischareg and you will finf there
are hundreds of papers on the subject. Merely rubbing your hand across wool
or cloth or a waxed desk and garbbing an electronic device will cause ESD .
Hold a pocket calculator in your hand while you rub your hand against
Hello List,
Is this a reasonable expectation - that the EC and member countries will
actually move quickly enough to make A14 effective on January 1, 2001? Is
everyone going to be forced to meet EN 61000-3-2 without A14?
Paul O'Shaughnessy
Affymetrix, Inc.
-Original Message-
From:
Group,
Is anyone knowledgeable on how a UL Class 2 Flammability rating correlates
with a UL 94-V? or HB rating? I have seen the Class 2 flammability ratings
on air filters. I have a Telecom product that is being designed not only for
UL-1950 certification but will meet the Bellcore GR-63
I wasn't aware of this problem, but having checked out our site, I
can only plead guilty, m'lud. I've not had time to update the image
files yet, but I have added a new file which gives the proper
proportions including the square grid shown in the Directives
themselves.
Take a trip to:
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