Hans,
We have recently established an agency within Hanoi for the purpose of
obtaining approval of telecom and wireless products thru the Post and Telecom
Quality Control Centre of the Vietnamese DGPT.
We can confirm that E1 (not T1) and DSL approval requirements exist, which
include
I could be wrong -- need to go through the exercise and see if it makes
sense Tell me if I'm missing something critical...
50ohm source, line, load and all connectors = no VSWR; adding any 50 ohm
attenuator will not increase the VSWR.
If any of the above is NOT 50 ohms, there will be
What, if any, requirements does Vietnam have for EMC, Safety and telco for
DSL/E1/T1
type of products?
Thanks in advance
=
Best Regards
Hans Mellberg
Regulatory Compliance EMC Design Services Consultant
By the Pacific Coast next to Silicon Valley,
Santa Cruz, CA, USA
408-507-9694
Hi John:
I read in !emc-pstc that Crabb, John jo...@exchange.scotland.ncr.com
wrote (in B6CD5947CF30D411A1350050DA4B75FF03C2341C@sgbdun200.scotland.n
cr.com) about 'South Korean Power System', on Wed, 20 Feb 2002:
Typically I would expect IT equipment to be safe if line and
And, to add to what Jim has said, I can only guess what would happen to
sensitive, or not so
sensitive, electronics, internal wiring or electromechanical parts when an
open-air discharge occurs
inside a product, especially a shielded product. Erratic behavior may be the
lesser of what could
Gabi,
In my experience these crude spark gaps do work - for a while. The tips of
the triangles tend to erode during surge testing, thereby raising the
voltage required to jump the gap. I like the fact that you are only thinking
of them as an addition rather than as primary protection. There are
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A01F13E58@flbocexu05) about 'EN60950-1:2001', on Wed,
20 Feb 2002:
Is EN 60950-1:2001 the same as EN 60950:2000 but renumbered, or were changes
introduced?
No, there are significant differences.
--
I read in !emc-pstc that Scott Lemon sle...@caspiannetworks.com wrote
(in 3c73e44e.a0d15...@caspiannetworks.com) about 'Safety of Indicating
LEDs', on Wed, 20 Feb 2002:
The scope of EN 60825-1 says LEDs are included whenever the word laser
is used, meaning they are to be evaluated the same way
Hi Bogdan,
I'm sorry if you thought that my previous message was an endorsement for
using necked down PCB traces as a fuse. I understand and share the
sentiment that it is an unpredictable and probably not even cost
effective solution.
I was wondering why anyone would shape a PCB trace in
Isn't the other issue here that creepage and clearance are normally required
between live parts and from live parts to ground?
If you buy components, you can go get approved components.
If you do it yourself on the board, you're going to invoke all kinds of
extra approvals work - evaluating
Mike:
My experience tells me that an attenuator designed for the same
impedance as the transmission line, will **always** improve the
VSWR at the source, irrespective of how bad or good the load VSWR
is. (It is most helpful to think in terms of reflection
coefficients rather than VSWR directly,
The attached message had PERMANENT fatal delivery errors!
After one or more unsuccessful delivery attempts the attached message has
been removed from the mail queue on this server. The number and frequency
of delivery attempts are determined by local configuration parameters.
YOUR MESSAGE WAS
Is EN 60950-1:2001 the same as EN 60950:2000 but renumbered, or were changes
introduced?
Richard Woods
Sensormatic Electronics
Tyco International
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Forwarded for Matt Campanella
Original Message
Subject: Northeast Product Safety Society Meeting on Wednesday, February
27
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 20 Feb 2002 19:14:16 +
From: matt.campane...@att.net
To: emc-p...@majordomo.ieee.org
There will be a
Gabi,
A couple of things for you to consider.
You don't want to base your gap size on breakdown in air. You will need to
account for the dielectric material of the PCB and possibly a conformal
coating or solder mask on top of the etch.
You need to decide whether or not you really want a
Hi Chris:
1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for
air? Seems different than what I can remember; but I don't have a
reference handy. It also seems to me that this would be very dependent
upon humidity and pollution degree?
In a separate message,
To add a bit to Rich's comment.
The Argentina and China (PRC) plugs have polarized plugs that are very
similar to Australian style (without a caliper it is hard to tell the
dimensonal differences). The PRC plugs are the same as the Australian
polarization while the Argentina plugs are opposite
Gabi,
The topic of an air-discharge spark gap is a little bit more complicated.
1) The breakdown voltage in air for a homogeneous field is given by the
Paschen-equations, providing
that the breakdown is a gas discharge process, not an explosive surface
process (happens at
high
Just side comments to hopefully get discussion going... (See Gabi's
email below)
1. Can anyone else verify the breakdown voltage of 1Megavolt/meter for
air? Seems different than what I can remember; but I don't have a
reference handy. It also seems to me that this would be very dependent
upon
Seems an attenuator COULD improve matching and VSWR if it then became a
significant part of the load impedance; it isn't a given. On the other
hand, adding the attenuator should NOT cause the VSWR to become very high
unless it is not a 50 ohm attenuator..
Mike Hopkins
-Original
I designed those in the late 70's in PCB's while at Experimental Physics Corp.
They
have been used with various degrees of success (depends on your expectations!)
The
major problem is the lack of predictability of the switch voltage. Many factors
such
as exact radius of the tip, solder mask
Hi Scott:
The scope of EN 60825-1 says LEDs are included whenever the word laser
is used, meaning they are to be evaluated the same way lasers are. Does
this apply to status indicating LEDs (non-lasing)? If so, are
manufacturers expected to test every status-indicating LED on
I read in !emc-pstc that Crabb, John jo...@exchange.scotland.ncr.com
wrote (in B6CD5947CF30D411A1350050DA4B75FF03C2341C@sgbdun200.scotland.n
cr.com) about 'South Korean Power System', on Wed, 20 Feb 2002:
Typically I would expect IT equipment to be safe if line and neutral
were reversed, except
Hello Group,
The scope of EN 60825-1 says LEDs are included whenever the word laser
is used, meaning they are to be evaluated the same way lasers are. Does
this apply to status indicating LEDs (non-lasing)? If so, are
manufacturers expected to test every status-indicating LED on the
product as
Here is another one:
http://www.kropla.com/electric2.htm
Ed
From: oover...@lexmark.com
Reply-To: oover...@lexmark.com
To: emc-p...@majordomo.ieee.org
Subject: International Power Requirements
Date: Wed, 20 Feb 2002 11:23:02 -0500
Check out this website for power requirements, plug
Hi Ed:
With few exceptions, most power distribution
systems have one pole of the supply, the
neutral, grounded. (Indeed, the definition
of neutral for single-phase systems is the
grounded conductor.)
In the IEC scheme of the world, a power
distribution system where the neutral is
The attached GIF image shows frequency allocation in Japan.
Regards,
+=+
|Ronald R. Wellman|Voice : 408-345-8229 |
|Agilent Technologies |FAX : 408-553-2412 |
|5301 Stevens
The Guide to Worldwide Plug/Socket Patterns and Power Mains (Single Phase)
reports Japan as 100V, 50/60 Hz. See:
http://www.panelcomponents.com/guide.htm
Brian Epstein
Sr Regulatory Compliance Engineer
Veeco Metrology
112 Robin Hill Rd
Santa Barbara, CA 93117
brian.epst...@veeco.com
Can help you on question 2)
The L10 figure is indeed often used by fan manufacturers and does
specify the statistical time after which 10% of the fans will have
failed. It is an expression for components whose failure rate is
dependant on time of service, i.e. they have a non constant failure
Darren,
The information that I have seen from the two sources listed below is that
Japan is nominally 100V 50/60 Hz. The 50 Hz is primarily in Eastern Japan
(Tokyo, Kawasaki, Sapporo and Yokohoma). The 60 Hz is primarily in Western
Japan (Osaka, Kyoto, Nagoya and Hiroshima).
Check out the
Since the Japanese use the North American style plug (seems an odd
choice since it is so flimsy in comparison to other types they could
have used), it's probably a good bet that the Koreans us this as well.
I'd be surprised if they used the Schuko plug.
Bob Wilson
TIR Systems Ltd.
Vancouver.
A good source is http://kropla.com/electric2.htm
http://kropla.com/electric2.htm .
According to that site:
Japan100V50/60 Hz*
*Eastern Japan 50 Hz (Tokyo, Kawasaki, Sapporo, Yokohoma, and Sendai)
*Western Japan 60 Hz (Osaka, Kyoto, Nagoya, Hiroshima)
One of the Japanese islands also has a 50Hz power grid. Apparently it's
a real dog's breakfast there, as far as AC power systems are concerned.
The voltage is 100 V, not 110V (as the original poster had mentioned).
Bob Wilson
TIR Systems Ltd.
Vancouver.
IEC60950 has a requirement (1.6.4) that the neutral conductor,
if any, shall be insulated from earth and from the BODY
throughout the equipment as if it were a line conductor. Components
connected between neutral and earth shall be rated for the
line-to-neutral voltage.
Typically I would expect
The standard voltages are 100 V (the standard outlet) and 200 V, and one
half of the country uses 50 Hz while the other half uses 60 Hz. The division
is North and South, but I don't recall which half uses 50 Hz.
Richard Woods
Sensormatic Electronics
Tyco International
-Original
Hi all,
I have seen PCB designs with two triangular shaped copper pads pointed
towards each other at very close proximity, meant as an air gap discharge
path for transients. Does anyone have information about such designs,
whether they work and how well ? At a breakdown voltage for air of 1
Check out this website for power requirements, plug styles, and languages.
Look under South Korea for Korea.
ftp://ftp.lexmark.com/pub/networking/internat.htm
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc
Much of Japan is 100V 50Hz (worst case for transformers). Japan approval
should cover 50/60Hz. Hotels generate a 120V 60Hz for US appliances.
The 200V supply is more complicated. I had a JEOL electron microscope that
wanted 3-phase 200 volts. They would not let us run it on 208V 3-phase and
Darren -
the Japan mains voltage in the range you request is 100V.
As I understand it, though this is open to correction, Japan
has both 50Hz and 60Hz distribution systems, depending upon
where you are located, even on the large island. I do note,
however, that the US Dept. of Commerce's
Hi Listmembers!
I asked a general question yesterday about Korean AC power, but now I have a
little better idea about what I need to discover. One of our field engineers
said that AC power at South Korean military bases used the SCHUKO style
outlet system. But he said that one of the power pins
Japan Mains Voltage is 100V. The north half of the country is 50 Hz and the
South Half is 60 Hz. Or is it vice-versa...
-Original Message-
From: Darren Pearson [mailto:dar...@genesysibs.com]
Sent: Wednesday, February 20, 2002 4:46 AM
To: emc-p...@ieee.org
Subject: Japan mains voltage
On Wed, 20 Feb 2002 12:46:19 -,
Darren Pearson dar...@genesysibs.com wrote:
Can anyone tell me what the mains voltage is in Japan,
I think it is 110V but I do not know the frequency.
The nominal voltage is 100V, and the frequency can 50Hz or
60Hz depends to the area.
apart from
-Original Message-
From: Spicer, Keith
Sent: 20 February 2002 15:47
To: 'Darren Pearson'
Subject: RE: Japan mains voltage
Try the following urls for information about the mains voltage and
frequency of various countries
http://www.kropla.com/electric2.htm
A good source is http://kropla.com/electric2.htm
http://kropla.com/electric2.htm .
According to that site:
Japan100V50/60 Hz* A, B http://kropla.com/!ab.htm
*Eastern Japan 50 Hz (Tokyo, Kawasaki, Sapporo, Yokohoma, and Sendai);
Western Japan 60 Hz (Osaka, Kyoto, Nagoya, Hiroshima
The table on this page is a pretty good reference:
http://www.voltageconverters.com/voltageguide.htm
http://www.voltageconverters.com/voltageguide.htm
Paul Hare e: ph...@pirus.com
Compliance Engineer w: 978.206.9179
Pirus Networks f: 978.206.9199
43 Nagog Park
Darren,
The mains voltage in Japan is 100V +/- 10%. Half of Japan is supplied from
a 50Hz system and another half is supplied from a 60Hz system.
John Radomski
Clare
I read in !emc-pstc that Darren Pearson dar...@genesysibs.com wrote
(in 001a01c1ba0c$c7243fa0$0a00a8c0@darrendesktop) about 'Japan mains
voltage', on Wed, 20 Feb 2002:
Can anyone tell me what the mains voltage is in Japan,
I think it is 110V but I do not know the frequency.
According to World Electricity Supplies from BSI,
voltage is 200/100, 60 Hz.
We have certainly produced 100V 60 Hz specials for
Japan.
Regards,
John Crabb, Development Excellence (Product Safety) ,
NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road,
Dundee, Scotland, DD2
Can anyone tell me what the mains voltage is in Japan,
I think it is 110V but I do not know the frequency.
apart from this, does any one know of a web site that gives information about
the mains voltage and frequency of various countries ?
Regards Darren.
Darren Pearson
Radio Telecom
Hi,
I'm looking for an English version of china radio standard AD/T 1158-2001.
Any information will be very welcome.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at:
Hi,
When I set the Conducted immunity test up for folks I ALWAYS add an
attenuator on the front end of the spectrum analyser. Typically I use a 25
watt 10 dB pad followed by a 20 dB 1 watt pad. I use a good quality
attenuator, and if accuracy is really critical, I characterise them and
In my experience attenuators improve impedance matching and hence VSWR.
There must be something wrong with your set up.
Regards
Chris Colgan
Compliance Engineer
TAG McLaren Audio Ltd
The Summit, Latham Road
Huntingdon, Cambs, PE29 6ZU
*Tel: +44 (0)1480 415 627
*Fax: +44 (0)1480 52159
*
Jim,
You are correct, CISPR 11 refer to class A/B and the mains power
distribution system.
When I quoted the locations from EN50081-2 (emission), I forgot a footnote
so let me correct it:
- industrial, scientific and medical apparatus (ISM) (footnote 1) are
present
(footnote 1): As defined in
Amund,
I am curious why you included ISM in your list of industrial locations. ISM
can be either class A or class B. I thought the distinction was made
according to the mains power distribution system; CISPR 11, subclause 4.2.
JIm
-Original Message-
From:
Hi Listmembers:
Can anyone tell me which is the correct electrical wiring commonly used for
South Korea? I understand that the power is 60 Hz, 220 Vrms.
I believe that two types of outlets are common there. First is a two round
pin, round connector. This does not have a safety ground
In Europe we use a ETSI standars for this EN 301 489-1 and EN 301 489-7
TRy on http://ww.etsi.org are free
Ciao
Paolo
At 08:09 2/19/02 +0900, Jong Ho,Lee wrote:
Hi Folk
I want to know EMC standards and Test specifications of GSM as follow.
¡á GSM phone
¡á GSM accessory (i.e. Adaptor,Ear
I read in !emc-pstc that Patrick Lawler plaw...@west.net wrote (in
t6157u4ruiugh8ji8e8em5oc6adebrl...@4ax.com) about 'Chamber Doors', on
Tue, 19 Feb 2002:
Are you sure? Berylium Oxide (BeO) has a long-standing reputation for being
toxic, but I've never heard of metalic berylium (Be) posing a
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