I am in a discussion and would like to see what the general opinion is.
The discuss centers around where to place an external power supply while doing
CISPR 22 emissions testing; on the table, on an insulator in close proximity
with the ground plane or on the ground plane.
The power supply
Hi
A simple question for you,
Can any one recommend a lab that can do NEBS testing on a telephone line tester.
Either in the UK or the USA
If so please let me have there details.
Regards Darren.
David, my suggestion is to determine which is the worst case EMC environment
- the applicable standards or the actual environment - and design for that.
We had a similar problem with a particular CCTV installation. The CCTV rf
immunity standard specifies 10 V/m; however, the guard watching the
Hello All:
Just a quick followup on our discussion about the short circuit tests:
I just received my copy of Issue 3 of GR-1089, and when I went to replace
Issue 2 I found a 1-page bulletin from Telcordia, dated December 1999, tucked
in the front of my Issue 2 binder. The bulletin
All -
One point that seems to be missing from this discussion is
that an IP telephone looks like a telephone, acts like a
telephone and for all intents and purposes *is* a telephone,
irrespective of how *telecommunication* is transformed,
transmitted, protocol converted, stapled, spindled folded
I read in !emc-pstc that Ted Rook t...@crestaudio.com wrote (in
sdef3745@peavey.com) about 'Undervoltage/Overvoltage Effect on
Household Appliances' on Thu, 5 Dec 2002:
In my semi rural home 50 miles NW of NYC I have the normal 120V 60Hz domestic
supply. The well water pump starts
I read in !emc-pstc that Peter L. Tarver peter.tar...@sanmina-sci.com
wrote (in nebbkemlgllmjofmopleoebdecaa.peter.tar...@sanmina-sci.com)
about 'Here's a good laugh' on Thu, 5 Dec 2002:
Hi-ho, hi-ho, it's off to CENELEC I go ...
It won't give you an answer. CENELEC is responsible for the dow.
Hi Charles:
a) Does anyone one know the genesis
of the requirement to lift the Neutral
AND the Ground simultaneously
during a leakage current test??
(I am referring to UL6500)
While I am not familiar with UL 6500 per se,
I believe I can comment on the lift of the
neutral.
Charles, et al,
a) Does anyone one know the genesis of the requirement to lift the
Neutral AND the Ground simultaneously during a leakage current test??
(I am referring to UL6500)
answer a) A requirement to lift both the Neutral and the Ground
simultaneously during the leakage current test is
Dear group,
A customer has been asked to redesign a board to stop it malfunctioning due
to vibration, temperature and radio interference. They have been given a
control PCB which they are told is the main culprit for the malfunctions.
They circuit is mounted in an armoured vehicle as part of a
Ghery,
Ken,
I think they were called micro-Q ... I am not sure if they are being produced
any more. Last time I saw one was about 5 years ago or so. The pins were
designated to correspond with Vcc and logic common.
You may want to contact Circuit Components Inc. which was identified in the
An RJ-45 connector used by an IP phone does not plug into an RJ-11 POTS
line. So it can't be simple plug into the pots lines. It would take conscious
intent and electrical knowledge to make it fit, beside being an illegal
modification of the product. The proper standard for an ITE device is
Peter,
You'll probably get no more than anecdotal feedback, so here's mine.
Regarding undervoltages, I can think of nothing damaged by low voltage
in itself, only its consequences. The primary cause is the need for some
products to maintain its power output or speed. For a lowered voltage,
you
I believe the answer to be it depends
The reason is that the appliance manufacturer has to meet various national
electrical safety standards before he can place his goods on the market.
The type approval for domestic electrical safety will include operation on 90%
and 110% of the 50/60Hz
Calling safety experts:
a) Does anyone one know the genesis
of the requirement to lift the Neutral
AND the Ground simultaneously
during a leakage current test??
(I am referring to UL6500)
b) What human body model is appropriate
for UL6500? Can I use the one in UL1950??
Best Regards
Charles
Some fire tests use a methenamine timed burning
tablet.
This tablet is specified in USA government
standards for furniture flammablity testing.
(See 16 CFR Part 1630.4 or CPSC standard FF 1-70.)
It is also specified in ASTM D2859. I have also
seen it used to test fire enclosures
in
Everybody
Can anyone offer advice as to whether the above VDE standard is in anyway
comparable in content to EN61010: Electrical equipment for measurement and
control use - safety requirements?
Thanks
Ian Gordon
_
This e-mail
Peter-
In general, most electronic devices are fairly tolerant of undervoltage, as
many of them use switching power supplies. The power supplies will continue
to operate happily until some low voltage, at which point many will simply
refuse to start up. High voltage can be a problem, causing
Peter -
Any appliance with an ac electric motor, with the exception
of electric clocks (which use synchronous motors), will
overheat. Whether or not this will lead to an unsafe
condition will depend on the robustness of the design and
the duration of the overvoltage.
Similarly, appliances with
Alan,
If the device looks like a telephone and can easily be connected to the POTS
(e.g. RJ-11 or RJ-45), you can assume someone will try to connect it to the
telephone network. So due diligence means RTTE testing and marking, if
only to warn via the 'alert' symbol that the device does not
You may recall that I requested an official document from
the EC that clearly stated how the docopocoss related to
manufacturing. After receiving a few pat answers that did
nothing more than regurgitate what's already public
information in the Blue Guide and not addressing my specific
query, I
Alan,
_IF_ your product is covered by the RTTED _THEN_ there is no lower voltage
limit for safety (or anything else). In fact, this is also true for the
upper voltage limits. Therefore, the RTTED applies to mobile 'phones even
though they are powered from 3V batteries. If you invented some
Richard Hughes said:
++ Moreover, since the said telephone is connected only to an SELV
Circuit then
++ it falls below the lower voltage limits of the LVD (50 Vac, 75 Vdc)
and so
++ the LVD does not apply.
I thought the RTTED referral to the LVD removed the voltage limits of
the latter?
I would like to appologise for the advertising banner added to my e-mail
to this group concerning the VOIP phone and the RTTED. This was added
automatically without my knowledge and has been removed. Appologies if this
caused any offence.
Regards
Mark Render
EMC and Radio Group Manager
KTL
For all banned material log on to:
www.dti.gov.uk/support/summary.htm
and check out raft conciliation text for ROHS. Directives. This is the
nearest official document currently available as the final form of the
directive has not yet been agreed.
Regards,
Neil Helsby
Dear All,
I am interested the damaging effects on components of electrical household
appliances as a result of overvoltages and/or undervoltages.
As an example, what are the types of components that would be damaged in a
TV or personal computer from an undervoltage or overvoltage in the
Peter,
I agree with you that, unless someone out their can point to a TCAM decision
to the contrary, an IP telephone that is for connection only to an SELV
Circuit interface is covered by the RTTED.
Moreover, since the said telephone is connected only to an SELV Circuit then
it falls below the
Ken
Try Micro Electronic mfg LLC www.microem.com telephone 949-766-8596 for
filter inserts. They come in different cap ratings and various connector
designs.
Dan Anchondo
-Original Message-
From: Pettit, Ghery [mailto:ghery.pet...@intel.com]
Sent: Wednesday, December 04, 2002 4:34 PM
Try this http://www.metatechcorp.com/CPD_PAGE.html
not to be confused with http://www.metatech.org/
regards,
Cameron O'Phee.
Electromagnetic Compatibility Safety.
Aristocrat Technologies Australia.
Telephone : +61 2 9697 4420
Facsimile
Ken,
I found a similar product on page 179 of the 2002 ITEM made by Metatech. Is
this what you're looking for?
Ghery Pettit
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, December 04, 2002 4:08 PM
To: emc-p...@majordomo.ieee.org
Subject:
Members:
I am looking for manufacturers of capacitor filter inserts that are pushed
into pre-existing connectors and provide capacitance from selected pins
through a ground plane included in the insert to the connector shell. I
think TRW developed these a number of years ago and called them
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