Hi Chris,
I agree with your whole heartedly. If it weren't for people there
wouldn't be an ESD problem. We are wither walking around charging others
stuff like furniture or worse yet we charge ourselves and the go around
touching stuff. For the most part I know of nobody that is able to
Greetings,
For those of you who are interested in attending the Colorado Product Safety
Technical Committee (CPSTC) meeting, please read on.
If you plan on attending, please let me know by Friday April 27, 2001, so I
can plan accordingly with the food and drinks. Also, if you need a map, let
me
Ed,
Desirability may be a moot point. Whether you want to test the
membrane keypad as a contact discharge or not the test equipment may not let
you. The Haefly-Trench ESD gun (PESD 1600?) for one checks continuity
through the tip before it enables a contact discharge. If you pull the
Doug -
Quoting our new President, you are misunderestimate yourself in item 15
particularly.
Also, I believe it is relevant to quote one of Scott Adams' refreshing
observations (11/5/00).
- Starting today, the Job requires a Ph.D.
- Whew! Luckily, I have a Ph.D.
- You do?
Hi Ed,
I fully agree that membrane keypads are one of the most common places
where a finger could discharge to the instrument.
However, I disagree that contact discharge is the appropriate test method
for these surfaces. Current state of the art in test instruments and
methods dictates
I once was in a hurry to get out the door to a racquetball game. My
shorts were still damp and I got to thinking about how microwave ovens work
and their effects of the on water content of items. Rapidly following a
flawed string of logic I decided the microwave would a quick solution to
Ken,
Depend on the type of transformer, such as isolating or signal, you should
be aware of the following:
1. The temperature rating would dictate the insulation class A (105), B
(130), and so on... in accordance with IEC85. These insulating systems will
identify the tapes, wires, plastic
Dear Colleague,
Does anybody have done any conducted emission test on telecommunication
ports per EN55022 1998 standard requirement?
Currently, we have performed a conducted emission test of our product on the
shielded telecom port by using ISN and current probe methods, and the
results of both
Several years ago I went to warm up some peanut butter I kept in the fridge
so that it would spread easier. I had not noticed or forgotten that the
(metallized) security wrap underneath the plastic lid had not completely
detached from the jar lip. I got a spectacular light show right through
RAM absorbs rf energy by virtue of a controlled conductivity via impregnated
carbon, but it is a broadband effect, just as you state. 2450 MHz is the
frequency which excites vibration in H2O molecules, so H2O is PARTICULARLY
efficient at absorbing energy at that frequency. Certainly other media
Usually, you have to submit an unpotted transform and while not a
big deal it takes extra co-ordination with the transformer folks. A more
important feature, at least for me, is that the vendor has to prove all of
the materials and thicknesses, not me. It also allows the manufacturer of
I once warmed up some leftover take-out Chinese food in the take-out
containers with the metal handle. The laws of physics worked -- the handle
burned the container.
Water is apparently resonant at 2450 MHz, but metal also reacts to EM waves.
Your dishes may have metallic compounds in the
-Original Message-
From: Chris Maxwell [mailto:chris.maxw...@gnnettest.com]
Sent: Monday, April 23, 2001 4:45 AM
To: 'Dan Kinney (A)'; Douglas C. Smith; Terry Meck
Cc: emc-p...@ieee.org
Subject: RE: ESD generators max Contact discharge level
Hi Dan,
Air discharges are made anywhere
Since the contact method requires penetrating thin, cosmetic coatings, it
is a bad idea on membrane keypads; bore that sharp point into the contacts
and it's ruined even before you hit the electronics. Not that they'd fare
all that well with direct discharge! In any case, there is often some
A lump of coal will heat up in a microwave oven. No water needed. It is the
bulk resistivity of an object which allows circulating currents to generate
heat, and while water can help (when we wet something, its chemical bonds
are a source of electrons) it is not the only thing that is heated in a
The Curtis-Straus Update is for April, 2001 is now available at:
http://www.conformity-update.com
The headlinea are:
VATICAN RADIO TOWER SPARKS ITALIAN PROTEST.
CANADA SEEKS COMMENT ON CELL PHONE JAMMERS.
FCC AMENDS PART 15.
PRODUCER OF DEFECTIVE BATTERIES PLEADS GUILTY TO FRAUD.
EU STANDARDS
Microwave safe dishes do not heat if put in an oven without food on them to
heat by conduction; melmac cannot be pt in a microwave because it does
absorb - I don't know what's in melmac but it must have some water content
that does absorb energy. Maybe the same goes for your pottery. It's
Luiz,
You can couch the following topics in whatever buzz words are in vogue
in your company, but I see the following list as the Product Safety cycle
of activities:
- Understand the applicable global product safety design standards.
- Establish any desirable company product safety
Does anyone have information on Koepfer Model SG41 Interference Generator's
Option 1500, a capacitive-inductive coupling fixture?
The SG41/option 1500 injects interference into data lines under controlled
conditions. Koepfer's drawing shows parallel data and pulse lines of defined
length and
Hi Dan,
Air discharges are made anywhere on the product where an insulator covers
possibly sensitive features.
Membrane keypads are a great example. The keypads contain traces and
circuitry that may be sensitive to ESD. However, since the outermost layer
is an insulator, making a contact
Ken,
The closest you can get is UL's category for Transformers (Construction
Only) and covered under their category XORU2. These are teransformers that
have been cosntructed to various standards and meet the constructional
requirements only. Testing is done as part of the end-product.
It is a
Ken Javor wrote:
Just goes to show you can find anything on the net. I have measured leakage
from microwave ovens and every one was at 2450 MHz. And that IS a resonant
frequency for water and water alone. That's why you can put waterless items
in and they won't heat up,
Hm, now I wonder
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