In the face of all the responses I and others gave last week showing the
MATHEMATICAL RULES for calculating logarithms and average and peak power,
and the rationale and math behind pulse desensitization calculations,
apparently it is still not clear that power is averaged, not potential. In
the
More info needed on type of power supply or whether unit simply runs off 12
Vdc. A power converter will definitely do the trick, but obviously is not a
solution unless it is already part of the EUT.
--
From: scott@jci.com
To: emc-p...@majordomo.ieee.org
Subject: Low Frequency
Hi Other Folks,
Read Case Study Building a Bridge Between Product Safety and EMC,
January/February 2001, Compliance Engineering article it should explain
everything you would like to know about line filter safety requirements.
Ron Duffy
-Original Message-
From: Allen, John
Hello Group,
I am working with and electronic device which contains and audio output.
During a low frequency conducted immunity test, a tone can be heard at the
output of the audio section with a frequency equal to that of the test
frequency. The test starts at the lower end of the audio
I read in !emc-pstc that Massimo Polignano
massimo.polign...@esaote.com wrote (in OFB42F2B94.C5CABD33-ONC1256AF4
..00369...@esaote.com) about 'Keep off the grass: RF emissions!', on
Mon, 29 Oct 2001:
Is there any applicable product standard dealing with EMC and safety of
that kind of devices?
I read in !emc-pstc that David Heald davehe...@mediaone.net wrote (in
3bdd7a08.5c37a...@mediaone.net) about 'IEC 60950-1 released', on Mon,
29 Oct 2001:
Is this equivalent to UL 60950? If so, the differences may be
substantial.
Not precisely equivalent, AFAIK.
--
Regards, John Woodgate, OOO -
I saw a piece on on this type of mower on one of the Dateline or other news
formats.
The one displayed also had the ability to be operated remotely by the owner to
trim
etc. In this case, the hand held transmitter would be an intentional radiator.
George Alspaugh
--
Hi Enci Other Folks
Comments:
1) The actual value of the capacitor may not the most significant factor -
it is the actual voltage effect on the user that is most important, and
that can be significant even if the filter meets the 0.1uF limit
requirements. Even if the capacitor is smaller than
Is this equivalent to UL 60950? If so, the differences may be
substantial.
Dave Heald
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at:
Apart from numerous small changes and clarifications, resulting from
experience/enquiries over the past couple of years there were the
following major items:
Requirements added covering the effect of UV on materials and people.
Added detail regarding use of lasers and LEDs;
Added requirements
If it is an intentional radiator and operates above 9 kHz, it is considered
to be a transmitter. If so, it is considered to be an inductive loop short
range device in Europe and subject to EN 300330-1 and -2 for radio emissions
and EN 301489-1 and -3 for spurious emissions and immunity. FCC Part
Hello everybody!
A friend of mine, overthinking of the breadth of my knowledge, is asking me
for some advise about the applicable standards to a rather unusual piece of
equipment. It is a auto mower intended to be programmed by the user to
cut within a given garden area. It makes use of a
Hi friends,
Thanks for all feedback!
What should I've done without your help .
Best regards
Amund
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at:
Jim,
Yes and no.
Yes. Medical ultrasound equipment is explicitly included in the scope of
Part 18 under Section 18.107(f). I assume the logic is that RF circuits are
required to generate the ultrasound.
No. Section 18.121 excludes non-consumer medical ultrasound equipment,
except for a few
At 09:31 29/10/01 -, John Crabb wrote:
IEC60950 requires that capacitor exceeding 0.1uF should have a means of
discharge resulting
in a time constant not exceeding 1 second for pluggable equipment Type A.
.. a means of discharge
As I understand it there is no need to blindly install a
Tania
The V in SVT does indeed stand for Vacuum and not Vinyl. In reference to
the Trade name of this type of cable being Vacuum cleaner cord not
suitable for hard usage.
Article 400 of the NEC, page 70-211 to 70-224 ( in the 1999 edition)
defines all the US cordage definitions. What the letters
I read in !emc-pstc that Andre, Pierre-Marie pierre-
marie.an...@intel.com wrote (in C406DCEF4576D511843B0002A5071ED51FC2D3
@irsmsx104.ir.intel.com) about 'IEC 60950-1 released', on Mon, 29 Oct
2001:
Is it possible to get a summary of the changes with the previous version ?
No, as far as I know,
There are many EMI filters on the market with a discharge resistor across
line and neutral
to discharge the capacitor(s). The filter we use has a one megohm resistor
built in.
IEC60950 requires that capacitor exceeding 0.1uF should have a means of
discharge resulting
in a time constant not
The normal answer is to fit filters with bleeder resistors across the
Line-to-Neutral capacitor, which is the main culprit for shocks.
In fact, I would ALWAYS advocate these - having known of several cases where
people have picked up unplugged equipment, and then dropped it due to the
reaction
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 20011029005000.JIZA629.femail8.sdc1.sfba.home.com@[65.11.150.27])
about 'CISPR 13, EN 55013', on Sun, 28 Oct 2001:
No connected cables. It was clearly a radiated test.
Your friend should ask the test-house to say **which
No connected cables. It was clearly a radiated test. Here is what we
worked out so far, but it seems rather bizarre so I was looking for an
alternative explanation:
It is an antenna induced limit like MIL-I-6181, but what throws me is the
arcane way (I think) they determine the antenna factor
Are there any connections, like earphone? The result look like the power clamp
measurement.
Ken Javor ken.ja...@emccompliance.com 10/27/01 04:05am
Assembled Experts,
A NASA colleague of mine has EN 55013 test results on an electronic
keyboard. The test results are a graph of dBpW vs.
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