It mostly comes down to how much protection you need and how much capacitance
you can stand on the protected lines. MOVs come to mind, but they do have a fair
amount of capacitance. There are other more complex ways to protect with diodes
or other silicon devices. You may need to do a layered
Hello Fellow Listees,
I was gone for a while but I am back once again. And I have a question
for the group. We use gas tubes in our products for protection against
lightning and/or surge. We now have an edict to get them out of all of
our products. So what does one use to provide similar
I'm thankful every time I start my car that water and electricity mix so
well with lead sulfate to produce sulfuric acid. It saves a lot of hand
cranking.
- Original Message -
From: Joe P Martin marti...@appliedbiosystems.com
To: emc-p...@majordomo.ieee.org
Sent: Wednesday, September
This question is addressed to those testing visual LED emissions to EN
60825-1. What test equipment are you using to measure the apparent source
size? Given that LEDs are about 5 mm in diameter, LED fiber optic
transmitters are about 2 mm in diameter and plastic fiber optic cable is
about 1 mm in
Dan,
Read on below R9-20 and the requirement is clarified significantly. The
requirements are DEFINITELY applicable to the outputs of your DC/DC
converters (a.k.a. embedded DC power supplies):
If your 48V feeds into a power supply circuit pack/module which then
supplies the 3.3, 5, 12, etc...
Hi Doug: Please let me know what you find out on this. I recently came
across a reference to inverters, in searching the JEITA site for harmonic
current limitation standards. That didn't make sense to me: an inverter is
a DC-AC converter that has no connection to an AC source and draws no
I missed the gist of the question the first time around.
A common domestic application of water and electricity can be found in
vaporizors. The devices are simply two electrodes at power line potential
immersed in water. The active area is restricted a bit to keep the water from
convecting
How about monitoring moisture in soil, where the resistance between two
probes changes as function of the amount of moisture (water) present, due to
the minerals/elecrolytes that get disolved by the water when present. This
would be useful for figuring out when to water indoor plants, or perhaps
Don, you can add EDM to your list.
Electrostatic Discharge Machining
Look it up on the web for more information.
Michael Sundstrom
NOKIA
TCC Dallas / EMC
of: (972) 374-1462
cell: (817) 917-5021
amateur call: KB5UKT
---
This message is
It only worked because of the high pollution levels in the Thames
caused by the Industrial Revolution... :-D
Sorry - Couldn't resist that
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email:
All,
I am curious if anyone has information relating to the use or to the
limitations of use of surge products located in power supplies or UPS products
within the EU.
Thanks,
Bryan Cole
Director of Engineering
Product Safety Officer
Emerson Network Power - Control Concepts
Binghamton, New
Hello esteemed colleagues,
I am searching for an English language version of a report writtne in
Japanese, I already have the title translated:
Calculation methods of harmonic current on inverters for industrial uses.
JEM- TR 201
Can enayone help with location of this report in English?
-Original Message-
From: Joe P Martin [mailto:marti...@appliedbiosystems.com]
Sent: Wednesday, September 11, 2002 3:58 PM
To: emc-p...@majordomo.ieee.org
Subject: Water + Electricity
Greetings,
A friend of mine is teaching elementary school students on the
dangers of
mixing water
Magnetohydrodynamics (MHD) was first proved by placing electrodes across the
Thames
river and using Earth's magnetic field, a potential was measured due to the
flow of
water (containing naturally disolved ions ofcourse, or it wouldn't have worked!)
I forgot who the scientist was, I want to say
You can say that electricity in a bathroom can be dangerous,
and in the UK, we are very cautious in this respect:
You don't have a wall mounted light switch in a bathroom,
it is either outside the room, or the light is operated by
a pull cord operated switch on the ceiling.
You are not allowed to
Hello Joe,
Also consider the industrial use of electroplating.
Best regards,
Dave Osborn
PM-CMS
Philips Medical Systems
+1 978 659 3178
fax +1 978 685 5624
dave.osb...@philips.com
One may remember the time that
huge rotary variable capacitors where used
(filled with salt water) to regulate the AC-motors
on Disney resorts attractions. They were boiling
all of the time.
Lifting one set of plates reduced the current and the motors.
This was definitely before the invention
If you have DC/DC bricks etc they will have the short condition tested.
So yes, backplanes, PCA's etc. also are subjected to the test. Some of these
bricks are handling 60 amps etc.
Gary
-Original Message-
From: Roman, Dan [mailto:dan.ro...@intel.com]
Sent: Thursday,
How about submersible pumps - used in wells, sumps, and even decorative water
fountains. Another example would be immersion heaters, used from making a cup of
tea to keeping stock tanks and bird baths from freezing.
Joe P Martin marti...@appliedbiosystems.com on 09/11/2002 03:58:29 PM
NEBS Gurus,
Do the 1089 bonding and grounding DC short circuit tests apply down to the
component level in a system or are they limited to the power supply or some
other demarcation point? If it applies anywhere in the system it seems to
me that you'd never finish testing. You'd have to test
Clause 6.2.3.1 (page 13) of the above standard talks about repeatability.
Does this mean that the harmonic tests must be repeated a certain numbers
of times or is repeatability used to determine or shorten the test
observation period?
Also in Table Z1 (clause 6.2.4, page 14), what is the type of
Hi Joe,
Postive results from the mixing of water and electricity can be found in
primitive desalinization techniques, and also as a means of generating
small quantities of hydrogen for laboratory use. Level detection in
water-containing vessels is another one as is the indirect heating of
water
Greetings,
A friend of mine is teaching elementary school students on the dangers of
mixing water with electricity. However, he also wants to show examples of
situations where water and electricity mix, yet does not cause a problem.
Does anyone have any examples?
Also, does anyone have a great
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