-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Scott Douglas
Sent: Monday, October 26, 1998 10:50 AM
To: emc-p...@majordomo.ieee.org
Subject: Required Margin for EMI?
Hello all,
When doing EMI scans of ITE, I
Scott,
Last year, CENELEC attempted to formalize a common practice for
measurement uncertainty (prEN50222). It failed.
In November 1997, during the CISPR/A meeting a decision was made to
issue a new international Committee Draft (CD) on this issue. I have
I am concerned with the requirement - or not - of having a disconnected
device other than wiring terminal block on equipment residing in telco
CO's. This would be for redundant -48 Vdc supplies.
I have been following the discussion lately and the intent seems to be
to provide that - possible
EMC Folk.
I have been reading all the learned submissions of what constitutes the
acceptable emission limits for EMC purposes. Most of you are very clever,
very technical, and I'm in awe of all of you.
But there seems to be a bit of a missed point here. EMC in Europe relates
to the EMC
Dear collegues,
I've heard some notice for a new frequency band ( around 860 MHz)
for low power unlicensed transmitting devices.
Moreover which are the applicable norms?
It seems tome that the etsi 300-220 doesn't cover this band .
Could some one shed light on this topics
thank you to all
Francis:
Refer to IEC 73 : Colors of indicator lights and push-buttons.
ISO 3864 : is Safety colors and safety signs. It does not detail the
requirements for indicators lights or LED's.
Also you can look to EN 60204-1, sections 10.2 and 10.3 for a condensed
version of IEC 73 specific for
Hi Again,
I received quite a few responses to my query regarding EMI limits and
margins. The results indicate that there are no actual written margins in
current standards. There were some old standards, i.e. VDE, from long ago
that specified either 2.0 or 2.2 dB margin. But these are no longer
Dear Francis,
I have used IEC 73 (BS EN 60073) Specification for coding of
indicating devices and actuators by colours and supplementary means.
BS EN 60204 Safety of machinery- Electrical equipment of machines also
has a section on indicating lights.
Ray Russell
ray_russ...@gastmfg.com
Sorry, to not get this in before your summary.
When Sony (video div) was my client, they had an internal spec margin
requirement of 8 dB.
That's right! 8 dB below Class B limits.
After going though that I'm convinced to use Sony equipment as support
electronics. g
TVs and radios have a specified signal rejection. That is, they must
continue to operate with a specified minimum signal to noise ratio and a
specified minimum signal. That noise signal may be a spurious emission from
another product. That derived noise signal is projected to a certain
protection
Joe,
Our laboratory was used to compare readings in the low-end, specifically 30
MHz. to 90 MHz. on an OEM product In particular the OEM customer who
maintains 10m indoor anechoic facilities claimed that our customer was
failing the CISPR22B limits by 5-6dB in the above freq. range. After
Ok, you guys got me. I didn't think it's take this long.
I confess. The gig's up. I'm the one ...
About 15 years ago in another company far away, I brought
a product into a reputable lab to be tested. It passed,
if I remember correctly, by -0.5 dB.
The confidence acid test back then was (and
Dear Scott,
For industrial type equipment, the European Standard EN60204-1
and the US, the NFPA 79 Standard are to be used for colors of
indicator lights and push buttons. Upon your review of these two
standards, you will note some minor differences in color specs.
Best Regards,
Date sent:
Dear Gary,
A terminal block ( I assume it is suitable for the number and size of
wiring to be accepted in the field and that it is Recognized/Certified
for field wiring) is an acceptable method for connection of telecom
equipment to the dc supply in a RAL (Restricted Access Location).
Since
Lauren and Bailin,
Thank you for updating us on this trivial yet complex issue.
Date sent: Mon, 26 Oct 98 14:35:11 PST
To: emc-p...@ieee.org, Crane,Lauren lcr...@aus.etn.com
From: b...@namg.us.anritsu.com Bailin Ma
Subject:
From: Steve Kuiper aegisl...@email.msn.com
Subject: Indoor vs. Outdoor emissions testing
Date: Tue, 27 Oct 1998 12:31:59 -0800
To: EMC-PSTC emc-p...@majordomo.ieee.org
Joe,
Our laboratory was used to compare readings in the low-end, specifically 30
MHz.
Thanks to all who replied to my request. The information has been a big
help.
Rob Graff
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