Hi Mike,
If the stringent ESD standard is "because a failure could be more
catastrophic", by the same token, please allow me to ask a question: "Do we
have more stringent ESD requirement for medical devices?"
Best Regards,
Barry
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From: "Mike Hopkins" , on 4/1/99 1:40 PM:
Quite fr
b...@namg.us.anritsu.com writes:
>If instruments in power stations need more stringent ESD standard, what
>about instruments in radio, TV, and cell stations? Did anybody have
>similar
>extraordinary feelings there?
>
>Barry Ma
>
Barry,
I rather doubt these "feelings" would show up in any of the
Quite frankly, I don't think higher ESD voltages in power sub-stations is
justified from the standpoint of the voltage threat. Modern sub-station
control rooms are much like office environments and older stations are
concrete floors with wooden or metal furnature (and not much of it!).
Perhaps th
Richard:
Here's some quick thoughts as a start.
I use an HP-8449 microwave pre-amp for 1-22 GHz, but most of the time, I stop
at 18 GHz in my work. I have also bought very low-noise octave-band pre-amps
from Miteq, and I have seen some ads recently from Minicircuits Labs
advertising very low c
Dear John,
UL746C is the correct standard you should be looking into and not
UL746D.
UL746D is a standard used for traceability of a molded part being
from a particular raw material. It is used when the UL end-product
standard requires the molder or fabricator of a polymeric part to be
under
I just found out that IEC61000-4-2 (ESD immunity) has it's first amendment.
What changes does it have?
Thanks,
--
Patrick Lawler
plaw...@west.net
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Barry and Others,
Good suggestions. I have always wanted to take a antistatic bag and shake
coins, where only the coins were affected, and measure the response perhaps
out of the top of the bag. Then put a non-ESD bag with coins inside a
antistat bag, making sure in both cases that the coins hit ea
Help! I am entering a new world of test frequencies; 1-26 GHz. I am seeking
recommendations for suppliers for:
* 30 dB notch filter at 2.45 GHz
* 40 dB high pass filter with a lower cutoff at about 3.5 GHz
* 1-26 GHz preamp
All of this equipment would be mounted on the mast and
If instruments in power stations need more stringent ESD standard, what
about instruments in radio, TV, and cell stations? Did anybody have similar
extraordinary feelings there?
Barry Ma
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Original Text
From: "Mike Hopkins" , on 4/1/99 7:35 AM:
To:
Cc:
Didn't mean to
The problem, of course, is that your'e trying to filter surge signals (the
low frequency components from a 1.2/50us impulse get down to pretty low
frequencies) which get close to the frequencies you want to pass. It's
extremely difficult to make filters with sharp cut-offs that will handle 6kV
impu
Thanks Peter.
With regard to UL 746C, I came across the UL 746 series this morning.
They are as follows:
UL 746A Polymeric Materials - Short Term Property Evaluations
UL 746B " " Long" ""
UL 746C " " Use in Elec. Equip. Eval.
UL 746D "
Dear John,
If I understand, the camera dome is being used as the mounting
means for the cameras which are already Listed.
UL could probably List a camera dome just like they List "Office
Furnishings". Most probably they would like to ensure that when
fixed to the ceiling according to manufact
Didn't mean to mislead -- my comment about "feeling the electricity in the
air" is just that, a subjective feeling Maybe ozone played a part; I was
too young and inexperianced to recognize it if that were the case. More of
a sensation -- I do remember the 60Hz hum coming from all directions as
Hi,
Currently, I am searching for some kind of warning statement on Plastic
Bag. The plastic bag that I am referring is those when you purchase any
product in the market, when you open the retail box to access the item, the
plastic bag that is used as packaging of and protecting the product. This
Hi Folks
I have read, and generally concurr with, Scott Douglas' and Richard Woods
comments re EN50116.
However, I would also comment further on RW's suggestion that EN50116 tests may
only be required if you have an external agency certification on your product:
- If you do have this certificat
Dear group emcers
In RTCA DO 160 the low frequency radiated emissions uses a Rod antenna
with a
counterpoise,
1, Is the counterpoise 0.5 or 0.6m square?
2, Is there a standard method of connecting the counterpoise to the
earth plane?
Many thanks for your assistance
Ian Ball
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This message
Hi Allen.
What kind of cable/wire are you using to connect your metal chassis and
your circuit ground to earth?
If you're using a small diameter cable, try using some wide earthing braid
instead (surface area is more important than actual metal volume because of
the skin-effect at the kind of fr
Koh Hello from Jerusalem!
Regarding safety, I suggest to use the General Product Safety
Directive. This is not a new approach Directive and does not call for
CE Mark or a Declaration of Conformity.
If speakers are part of the building installation, you may want to
check the Construction Mater
I know that the IEC Remote Power Feed Standard is back in committee. Based
on recent information, it appears that it will be adopted into UL 1950/UL
60950 when it is approved. Does anyone have any information as to when that
would be expected (i.e. 2000, 2001, 2005, never, etc.)
Thanks,
Jim
Jim
Dear Testsuya,
The EMC for Medical Equipment is covered under the Medical
Devices Directive and not the EMC Directive.
Regards,
> Hello!
>
> 89/336/EEC is published at OJ on 1999/02/27.
> This new directive is not include EN60601-1-2(Medical):1993.
> Anyone tell me what is this mean?
> What s
Dear All,
Thank you very much for all comment.
I got it.
Come to think of it, that is very easy current.
Best regards,
Tetsuya Hashimoto
A-pex International Co.,Ltd.
2nd EMC Division Yokowa Lab
E-mail: has...@a-pex.co.jp
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