There is a "radiated" emissions test for toys and I would advise doing the
test for all products. The radiated test for 55014-1 is a disturbance power
test mush as you described but I would not come to the conclusion that
passing EN 55022 Class B would be all right.
Also EN 55014-1 covers emissions and EN 55014-2 covers immunity.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
===============================================================
Bob Richards
<[email protected]
m> To
Sent by: David Heald <[email protected]>
[email protected] ieee <[email protected]>
cc
02/09/2007 11:08 Subject
AM Re: EN55014 & EN55022/24 test &
limit similarities?
David,
It has been a few years since I tested anything to 55014, and I don't have
access to 55014 now, so what I say may be dated.
IIRC, Unless the product is a power tool, 55014 has similar conducted
emissions limits. I believe the average limit is actually higher at 150kHz,
but pretty much the same as class B 55022 limits. Power tools have higher
limits.
In 55014, there is no "radiated" emissions test. However there is a
disturbance power test, which covers 30-300 MHz using an absorber clamp to
measure the emissions on any cables exiting the product. This test is what
some labs refer to as the "track test", since the absorber clamp has
wheels, and is moved along some sort of track to maximize the emissions.
There is a "click" test, or discontinuous disturbance test. This is an
additional conducted disturbance test for very short duration spikes in the
conducted emissions, due to switching transients that may exist in products
with relays or contactors. It is basically a relaxation of the normal
conducted QP limits for these transients. The amount of relaxation of the
limit is based on the click frequency, the fewer clicks the more the limit
is relaxed.
Conducted immunity covers up to 230 MHz instead of 80 MHz. There is no
radiated immunity.
I believe EFT and surge tests are similar.
I believe that if your module passes 55022 class B limits, and also the
next higher level in 55024, your module will probably not contribute to a
failure in the end product.
I hope this helps.
Bob Richards, NCT.
David Heald <[email protected]> wrote:
All,
I need to know if there are any significant differences in the test
levels specified in EN55014 and EN55022/55024. Access to my standards
service is temporarily down so I need some help...
I usually deal in the ITE realm, but just got a question from a customer
who wants to integrate one of our ITE modules into an appliance as an
information acquisition device that would then determine some settings on
the appliance. We usually test these modules to (among other things)
EN55022 & EN55024, but the customer is interested in EN55014. Are the
tests & levels contained within EN55014 substantially different from those
in 55022 or 55024 - i.e. are there any gotcha's that I need to be aware
of?
Note we qualified this module on a test board and tested to the next level
higher than would be required by EN55024 (i.e. 10V/m RFI, 8/15kV ESD,
etc).
Thanks in advance for any advice...
-Dave Heald
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