In message <[email protected]>, dated Fri, 29
Mar 2013, Carl Newton <[email protected]> writes:
For those interested, the document at this link is issue by R&TTE
Compliance Association and concerns "Guidance on Acoustic Safety". It
is directly applicable to this case I believe and it notes the 50332
standards among others:
This opens up a further can of large, wriggly worms. RTTE and the
Australian document cited are concerned with *acoustic shock*, defined
as:
Any temporary or permanent disturbance of the functioning of the ear, or
of the nervous system, which may be caused to the user of a telephone
earphone by a sudden sharp rise in the acoustic pressure produced by it.
(ITU-T and ETSI definition)
The EN 50332 standards and EN 60065/EN 60950-1/EN 62389-1 are concerned
with **long-term exposure**, incorrectly called 'acoustic shock' by some
people who were ill-informed. There is a VERY large difference between
these concepts - 40 to 65 dB.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Which Thunderbird will David Miliband pilot? Or will he drive Lady Penelope?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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