If anyone is working on such a paper, please consider presenting it at the TC-8
session of either the 2001 or 2002 IEEE EMC Symposium.
Jim
(Yes I am a little behind in reading the postings).
Reply Separator
Subject:Insulation failure - recent data
Auth
Hello,
Just want to throw my 2p --ooops 2c in.
This issue ( of ITE universally being Class B ) is not new. It started
way before 1995 when the generic standards were released mandating
that all equipment NOT tested to the heavy immunity should be tested
to Class B emissions. I remember distinct
Richard,
I agree! But why define a product standard (EN55024 in particular) that
defines limits that are only appropriate for a residential, commercial and
light industrial environment. Am I missing something?
Thanks in advance,
William D'Orazio
CAE Electronics Ltd.
Electrical System Design
Gents,
I have a couple of questions concerning equipment onboard aircrafts:
I was just wondering if the current revision of RTCA-DO-160 is D.
Is it possible that manufacturers are still using B.
As I do not have the B revision of the standard, does the B revision
have a
Whoa!
I work in CISPR 11 land, but as I recall, CISPR 22 works almost identically
in this regard. The difference between CISPR 11 and 22 is what TYPE of
equipment it is. CISPR 11 covers Industrial, scientific and medical (ISM)
equipment. CISPR 11 covers Information technology equipment (ITE).
Hi Ghery.
You wrote:
<< The law is 89/336/EEC, the EMC Directive (or as I like to call it, the EMC
Professional Employment Act of 1989). It lays down, as you note, the
essential requirement that a product not cause undue interference and that
it operate as intended in its itended environmen
I'll be testing a product to FCC Part 18 for the first time, and I'm trying
to familiarize myself with the limits in this requirement.
In section 18.307(a), conducted emissions limits are specified for
ultrasonic equipment. They start at 10kHz, and stop at 30MHz.
Yet the measurement procedure s
The answer to this debate is included in the essential requirement that a
product not cause undue interference and that it operate as intended in its
intended environment. The key is the intended environment. Class A equipment
installed in a residential environment would not comply with the essent
Let's discuss apples vs apples and keep the discussion to ITE. Household
appliances are not subject to EN 55022:1998, but have their own product
specific standard.
The law is 89/336/EEC, the EMC Directive (or as I like to call it, the EMC
Professional Employment Act of 1989). It lays down, as y
Hi Ghery,group,
Standards are NO LAW !
My reply was directed against the Clause in EN 55022, not against the
possibility of
EN 55022 to define suitable environments. However, there is a standards
writing
committee guidance document that requests the committees not to deviate more
then absolutely
Nick,
I have confirmed that there currently is not a reciprocal agreement for
discounting of the price of the standard for our IEE colleagues. I will
note that the member discount is $17 for the print version and $26 for the
electronic version, which would likely pay for 20-30% of an IEEE
membe
I agree that grounding is a complex topic which can't be fully covered within
this forum. However, I must make a general comment with regard to single point
ground versus multi-point ground for a digital board. There is in fact no such
thing as a single point ground for a digital board becaus
All,
If you worry like I do about equipment loss, damage and other Murphy type
effects, ask your local cal lab if they will do on-site calibrations. We
had our Haefely Trench burst and surge testers calibrated recently on-site
by PCI here in Austin, Texas. The cost was very reasonable, plus it
Hello Praveen,
The topic in which your question addresses is "Grounding". Grounding is one of
the most complex topics EMC engineers have to deal with especially in a design
that has both Analog and Digital circuitry. Most every case is different and
there are thousands of variables to consider
Gert,
All ITE equipment must meet the Class B limits? Where does it say that in
either EN 55022:1998 or CISPR 22, 3rd Edition? Section 4.1 of CISPR 22 is
quite clear about what equipment must meet the Class B limits. There are
many types of ITE that do not fall into the examples provided in th
We schedule in advance and usually get 1 week turnaround on cal plus
shipping time. We specify 2nd day Fedex. This makes the disruption to our
lab scheduling a minimum. Winter can pose some unexpected delays due to
weather conditions on the open area test site. Plan your cals for summer
when p
I'm wanting to obtain a copy of IEE STD 739-1995 which I know can be
downloaded from the IEEE web site. However, I was wondering if, as a
member of the British IEE, there is any kind of reciprocal agreement
where I can obtain IEEE documents at the IEEE member price.
Does anyone know anything
Hi Group,
The type of clause (see below) from EN 55022 about adding notes and
restrictions
to equipment is just the type the European Commission
objects against their use in the EN 55022 standard.
The reason is that the CENELEC was asked to propose limits and
test methods, not to replace politics
Hello Group,
We currently have a system which has modules in a box(metal) with floating
digital and analog grounds.It is a Class 1 (safety) equipment.
We intend to connect the 0V of each board to protective earth (chassis) at a
common single point at the power supply.
By doing this, the conduc
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