In message
<cabyvtvnhzay5zhrf6b6zvgqbxhskbtnwkxbu2n59xq2dz0q...@mail.gmail.com>,
dated Wed, 25 Apr 2012, Doug Powell <[email protected]> writes:
The in the acoustics section 12.5 of 61010-1 are the concepts of
operator and bystander positions. The standard clearly states
dimensions for the "test room", yet it does not clearly state what
distances are for personnel. Let's assume a control panel is mounted
in a rack system, at eye-level, and with buttons that must be pressed.
What would be the typical distances for the operator and the bystander?
For the bystander, 1 meter seems about right. In the past, I have seen
as little as 12 inches for the operator, but this seems a bit close.
My original thought was this may represent a person leaning with one
shoulder against a rack mounted panel. While the distance from the
panel surface to the ear of this person can be quite short, it is not
likely to be an operator's position.
A difference of only a few inches can make all the difference in your
results.
Basically, as you describe it, it's acoustic heresy. The environment
won't be anechoic, so it's anyone's guess what the sound level will be
anywhere. It could be much less 30 cm from the source than at 1 m.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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