Guys,
I don't think we want to forget that just one of these units will be in
use. What would a whole country full of these units do to a mains
network? I'd guess it to be very noisy indeed!
Michael Sundstrom
NOKIA
TCC Dallas / EMC
ofc: (972) 374-1462
cell: (817) 917-5021
amateur call: KB5UKT
-----Original Message-----
From: ext Chris Maxwell [mailto:[email protected]]
Sent: Thursday, January 17, 2002 6:19 AM
To: [email protected]; [email protected]
Subject: RE: Company close down due to EMC phenomena
It sounds as though...
The instantaneous emissions aren't as high as an EFT burst or other type
of transient phenomenon. So, this product causing a hard upset of
electronics is probably not a problem.
When the conducted emissions limits were set, they were mostly dealing
with whether the product would interfere with radio or TV. As a matter
of fact, the quasi-peak and average detectors are used in order to
simulate the response of the human ear.
I'm curious. If you set this product right next to a radio. Would a
human being even be able to perceive the 25millisecond burst?
Chris Maxwell | Design Engineer - Optical Division
email [email protected] | dir +1 315 266 5128 | fax +1 315 797
8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com | tel +1 315 797 4449 |
> -----Original Message-----
> From: [email protected] [SMTP:[email protected]]
> Sent: Wednesday, January 16, 2002 3:17 PM
> To: [email protected]
> Subject: Company close down due to EMC phenomena
>
>
> Well, this might be the reality in a case I have been introduced to
> lately.
>
> Case:
> A company are manufacturing PowerLine Communication products. They
> communicate via the power lines and a typical link is between a
> consumer
> residence and the nearest power station. The products can of course
> also
> communicate inside the consumers residence. The communication protocol
> is
> called CEBus http://www.cebus.org/which and make use of the frequency
> band
> 100kHz-400kHz and the amplitude is approximate 2-5V. A typical length
> of a
> transmission is 25ms and occurs approximate one time pr hour.
>
> First of all, AFAIK PowerLine Communication and PowerLine Transmission
> (broadband 1.6MHz-30MHz) are now coming will full force in EU and
> CENELEC/ETSI are working together regulate this type of transmission
> path
> and also coming up with standards.
>
> The problem for the manufacturer is the conducted emission
> requirements in
> EU. According to the EN55022B levels the maximum quasi-peak emission
> is
> 66dBuV@150kHz, and a typical PLC (under transmission) which has been
> measured, showed the value of 120dBuV (peak). With no transmission it
> had a
> margin of 10dB (quasi-peak) and 30dB (average). The radiated emission
> had a
> margin of 10dB.
>
> Well, conducted emission is the problem when transmitting. But, as I
> said,
> the transmission occurs only 25ms/hour.
>
> The national authority will not allowed this product to be placed into
> the
> marked because it do not fulfil the EN55022B limits (100kHz-400kHz)
> under
> transmission mode. No way.
>
> Other national authorities have other approaches on this case, they
> say " as
> long as you do not disturb other equipment, install it. If you do
> disturb,
> we will come and remove it". They also say " install it even if it
> does not
> fulfil EN550022B, but we will remove it if it disturb others".
>
> Two completely different approaches as you see.
>
> Questions:
> 1. Is it possible to have different approaches within EU ?
> 2. Since PLC/PLT is "quite new" technology and since we do not have
> any EU
> product standard (no standard for whose who are using 100kHz-400kHz
> band), I
> like the approach "as long as you do not disturb other equipment,
> install
> it. If you do disturb, we will come and remove it". What is your
> opinion
> about this?
> 3. The transmission occurs very seldom. 25ms/hour, that is 7e-6 and
> approximate 0,001% transmission rate. Can this seldom transmission
> rate be
> an argument to not test the PLC product under continuous transmission
> ? I
> would say yes, but which rate is acceptable / reasonable ?
>
> So, why should the company close down ? Because if the national
> authority
> gets what they want, there will be one sale. Logical, but is it a
> correct
> prohibition the authority call?
>
>
> Best regards
> Amund Westin, Oslo/Norway
>
>
>
>
>
>
>
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