Hi Dan,
Contact discharge is meant to be applied to conductive surfaces. If a
product has a plastic case, breakdown voltage (through seams and holes)
is the important parameter. This is best done with air discharge, the
object of which is not to have one.
Doug
"Dan Kinney (A)" wrote:
>
> While
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, and also why you should never run a micro
Group,
I was wondering if you could help me with this one? Currently, I have a
switching power supply, using custom transformers. Now I am looking at
submitting this product to a agency...
Many transformer manufacturers claim they build to UL ...standards,
obviously, this is not considered app
Hi Ken:
Here are some quotes:
http://www.eskimo.com/~billb/weird/microexp.html#demo:
Q: Aren't these ovens tuned to a special frequency so they only heat
water?
A: No. The usual operating frequency of a microwave oven is nowhere
near the resonant frequency of water, and the
While we're on the topic, I have a question (actually a couple) regarding
air discharge. Since contact discharge is the preferred method, as stated
in an earlier message and in EN61000-4-2, Paragraph 5, why would one perform
the Air Discharge method? The same paragraph states "Air discharges sha
Someone on this forum likely knows the answer to this question...
I was at Wal-Mart the other day and they had 2.4 GHz cordless phones on
clearance. My home cordless phones are 900 MHz. One is multiple channels,
the other is some kind of spread spectrum. 2.4 GHz is very close to 2450
MHz, the
The following is a story posted today on MSNBC with regard to cellphone
safety & lawsuits. FYI
http://www.msnbc.com/news/562131.asp
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web s
The only generators that I know of that did contact discharge above 10 KV were
the
Experimental Physics, later sold by Electro-Metrics. There were 7.5, 15, 25 and
30
kV contact discharge models. But those have not been made in a while and I also
doubt that the SOW writer meant contact discharge
I understood that only one company world wide had the patent for making the mercury wetted relay used in contact discharge ciruits, ABB if I remember correctly. I alos understood that these arc over at levels above 8 Kv.
Is there a higher voltage offering available elsewhere?
regards
John Croni
Hi Terry and the group,
Besides the question of finding a generator that can reach the level you
mention, I am not aware of any natural ESD event that approaches the
interference potential of even an 8 kV contact discharge. The problem
comes in that high voltage air discharges have relatively slo
>>Does anyone recall [...] ESD generator that simulated [...] => +-10 kV
CONTACT discharge.
I agree, your client _probably_ meant air, but better to ask.
Nevertheless, as I recall, NoiseKen makes an ESD tester that does 16kV
contact / 30kV air.
http://www.noiseken.com/english/equip/equip.htm
I'd like to add to George's great post.
Having done this type of reporting only once long ago with another
company far away, thank God, I reduced it as much as possible to
a typical UL type standard: construction and performance, with
some additional info.
Did the incident involve the constructi
Ed,
After recent inquiry, I found that an alternate way to get access to Free
Mil specs from the following website is to just put the numerical number of
the spec in the "document number" block. I am forwarding this bit of info
per recent request.
http://astimage.daps.dla.mil/quicksearch/
Best
Greetings,
We are in need of safety guidance in the final design of and the specifying
parts for an electronic ballast to be used in an ITE product. UL / EN 60950.
I have guided many products through UL Listing using recognized parts and
supplies. But I don't have the time for any oversights
Hello again:
Does anyone recall if there were any standard called for or ESD generator that
simulated as the case may be => +-10 kV CONTACT discharge.
We have a customer that is specifying passing +-16 kV ESD without referring to
AIR or Contact discharge. I am inclined to ask what they have
Hello Richard,
If you need details re the "Recall" aspect, visit the Safety Link
and using your browser's "Find in Page" tool, search
for the term "recall handbook". This will take you to a link to CPSC's
handbook on this subject.
Searching on the term "recall" will yield a link to another sit
Very good ideas, George, and we have implemented most of these in our
information gathering phase. We are not clear as to what is necessary and
sufficient information for the final report, especially when someone is
claiming injury or property damage and no fault is found. I just posted in
another
Stig, we put together a reporting process and that is working well and we
have been generating reports. But we have asked ourselves what information
is necessary and sufficient for the report. We based our process on
information in the following books.
Willie Hammer, Product Safety Management and
You have raised a very important question that many of us must deal with
in some way. I note you have received no replies via the listserver. I
know of no documented legal requirements for the incident investigation
process, although OHSA, CPSC, and others may have documented requirements
for
Dear Doug,
0 means 600 and greater
1 between 400 and up to 600
2 between 250 and up to 400
3 between 175 and up to 250
4 between 100 and up to 175
5 less than 100
I hope it helps. You may find more details on the UL website.
Respectfully yours,
Constantin
Constantin Bolintineanu P.Eng.
DIGITA
Doug,
Voltage CTI
600 V and greater 0
400 through 599 1
250 through 399 2
175 through 249 3
100 through 174 4
Less than 100 5
Best Regards,
Jody Leber
Laboratory Manager
jle...@ustech-lab.com
http://www.ustech-lab.com
U. S. Technologies
3505 Francis Circle
Alpharetta,
Hello Group -
In the UL IQ for Plastics database, the CTI values are given as a single
digit number, 0 thru 5. I know that the scale correlates to 100 V thru 600
V, but I forget which way it goes. Does CTI of 5 = 600 V, or is it the other
way around? Is this scale given in UL746A or IEC 60112 ?
Peter,
RSS 210 is the Industry Canada radio standard for Low Power License-Exempt
Radiocommunications Devices(All Frequency Bands).
RSS 139 is the Industry Canada radio standard for Licensed
Radiocommunication devices in the Band of 2400-2483.5 MHz.
These standards can be downloaded for free at
RSS stands for Radio Standards Specification and RSS210 covers Unlicensed
Low power transmitting devices ( All Bands) . I can send you the PDF file if
you wish.
The Industry Canada web site has most of these specs and RSS 139 is one I'm
not familiar with but I will obtain the title for you.
Try
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