Greetings,
I've got a few questions about flickermeters and EN 61000-3-3.
If anyone has experience using and perhaps calibrating
flickermeters, please e-mail or call. I would like to send a
manuscript for a peer review and to answer some questions I
have.
Thanks.
Group,
The biweekly update from IEC just arrived. The following may be
of interest.
You can get the update by sending e-mail to c...@iec.ch.
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| Martin Rowe | / \
| Senior Technical Editor | /\ /\
| Test Measurement World | /
Does anyone know of a web site that lists when the various EMC
standards will go into effect? If not, would such a web age be
useful?
/\
| Martin Rowe | / \
| Senior Technical Editor | /\ /\
| Test Measurement World | / \
As perhaps the only member of this list
who works for a publishing company, let
me explain why a designed language
won't work.
* We, the ugly Americans, want the
world to conform to our native language.
We're too lazy, stubborn, and arrogant
to learn another language.
* A designed
I've been reading messages from this list for several months,
and I see many questions about how to comply with the long list
of EMC standards. Yet, I can't recall anyone ever questioning
the appropriateness of any standard. That is, should the
standand add value to a product or to those who use
The company is CASSPER www.cassper.com. The system is sold
through EMC Test Systems www.emctest.com. Several members of
this list have seen the system. They say the demos are
impressive. But, those who saw the demo remain skeptical.
/\
| Martin Rowe |
Group,
A reader asked about the order of performing safety tests.
Should he perform insulation resistance tests before or after
hipot tests? The reader didn't say what type of product he's
testing, but I can ask.
Thanks,
/\
| Martin Rowe | / \
|
SAE J1113 series cover immunity of engine control units. I'm
writing an article that summarazes the tests. It will apprear in
the February 15 issue. You can download them at www.sae.org (PDF
format, but each test spec (there are about 20) costs $59 to
download. I downloaded three of the specs for
I need clarification on a spec for an e-field probe. The spec is
Tr less than 10 Hz.
What is Tr?
The probe is specified in SAE J1113/27 Electromagnetic
Compatibility Measurements Procedure for Vehicle Components:
Part 27:Immunity to Radiated Electromagnetic
Fields-Reverberation Method.
Our magazine's standard is k for both 1000 and for 1024. So,
1024 bytes appears as 1 kbyte (we always spell out byte. I
suppose we'd use k for Boltzmann's constant. Upper case K is for
Kelvin. We use M for mega (1 million) and m for milli (1/1000).
We also use M for the binary, as in 1 Mbytes.
Just remember to burn off the lighter fuel first. Do that
outside. You may also have to file down any burrs in the outer
tube, too. Sparks will take the shortest distance they can find
to discharge.
Scrape off some paint from the outer tube to attach a ground
return wire. Solder it in place if
Several members of this list have contacted me asking how to
recover damaged files from the unzipped_files.exe virus.
Here's how I did it.
I had Norton Utilities running on my PC at the time of the
virus. Norton creates an additional recycle bin called the
protected bin.
Open the Norton
This morning, I got hit with the latest worm virus. Somebody on
this listerver has or had it. I received a message
with an attachement called zipped_files.exe and unkowingly
opened it. The virust replaced all of MS office files (Word,
Excel, etc.) files with blank files, 0 kB.
The massage
I received the following announcement from IEC:
IEC 61000-4-28 (1999-11) - Electromagnetic compatibility (EMC)
- Part
4-28: Testing and measurement techniques - Variation of power
frequency,
immunity test
Establishes a reference for evaluating the immunity of electric
and
electronic equipment
Thanks to the 25 people who responded to my offer for a CD-ROM
with the 1996-1999 EMC Syposium Proceedings. Unfortunately, I
have only one copy.
Several of you asked where to buy a copy. You might try the IEEE
EMC Society web page, www.emcs.org, or Mira Digital Publishing,
phone +1
I have an extra copy of the IEEE-EMC Symposium proceedings from
1996-1999 on a CD-ROM. First person to send me your snail-mail
address gets it.
/\
| Martin Rowe | / \
| Senior Technical Editor | /\ /\
| Test Measurement World | /
The _Electrical Engineering Handbook_ (Editord by Richard C.
Dorf, 1993) defines a broadband emission on page 934 as:
An emission having a spectral distribution sufficiently broad
in comparison to the response of a measuring receiver.
So Werner is correct.
/\
|
My name is Martin Rowe, editor at Test Measurement World.
I'm interested in learning about problems with radiated EMI
measurements outdoors in the presence of digital television
(DTV) broadcasts. Does anyone have experience in this matter?
What sort of problems dies the 6-MHz flat spectrum of
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