Hi All,
I am pulling up an old thread here, because it may relate to my question.
Is there any requirement or guidance for sound pressure level limits from
ultrasonic equipment operating 40-50 kHz and used in a residential
environment?
61010 has a good reference in section 12.5.2, and 60950 has vague reference
in 0.2.6, but any other references are appreciated.
Best Regards,
Scott Drysdale
OOO - Own Opinions Only
On Mon, Apr 28, 2008 at 9:49 AM, Powell, Doug doug.pow...@aei.com wrote:
There is a difference between hazard levels and what I would call nuisance
levels. With nuisance levels, the noise might be an irritant but not
necessarily hazardous. This is especially true of noise that has a
harmonic content or several noise sources that have nearly the same
frequency but beat together. The exception to this might be where the
level of noise could mask a hazard or break concentration that is critical
to the task at hand.
I doubt there is much regulation available for low level noise which is a
irritant. I just did a quick check for the keywords noise and acoustic
in IEC 61558-1. There were no hits. IEC 61010-1 has a section 12.5 Sonic
and ultrasonic pressure. But this is about hazard levels. Also in IEC
60950-1 (Ed. 1) there is mention of this in the section principles of
Safety, but no real guidance.
Abatement for high levels of transformer noise especially in environments
like audio / video recording studios can be very challenging. Limits are
generally set by market forces, not safety regulation.
One of the best companies I have seen with is Brüel Kjær (
http://www.bksv.com/; http://www.bkhome.com/). You can also subscribe to
Sound and Vibration (http://www.sandv.com/) and they have a number of
resources that may interest you.
Regards,
-doug
Douglas E. Powell
Engineering Manager
Corporate Product Compliance
Advanced Energy Industries, Inc.
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
Carpentier Kristiaan
Sent: Friday, April 25, 2008 2:51 AM
To: EMC-PSTC
Subject: Standards for accoustic noise
Hi group,
Products with transformers sometimes produce noise due to fact that parts
of the transformer are not fixed well or due to piezo-electric effect.
The acoustic level is rather low but can be annoying.
Can anyone point me to standards that describe this kind of acoustic
measurements and limits?
Vriendelijke groeten, meilleures salutations,
mit freundlichen Gruessen, best regards,
Kristiaan Carpentier
Regulatory Approvals
Thomson Telecom Belgium
Prins Boudewijnlaan 47
B-2650 Edegem
Tel.: +32 3 443 6407
Fax: +32 3 443 6632
E-mail: kristiaan.carpent...@thomson.net
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