Ed,
I think our European friends may be able to direct us to a
standard, but I can't remember it right now. Having not made those
measurements in some time if forget which standards discuss them. When I
was making those measurements the levels were standards for office noise
of 55dBA for office environments and 70 dBA (I think) for other areas.
Bruel & Kjaer makes many sound measuring devices. There home page pretty
much sucks but here it is http://www.bkhome.com/btg_hp1.html
<http://www.bkhome.com/btg_hp1.html> There equipment is better than
their web presentation. They may also be able to point you at the
correct standards.
Gary McInturff
-----Original Message-----
From: [email protected] [SMTP:[email protected]]
Sent: Thursday, August 27, 1998 4:52 PM
To: EMC-PSTC
Subject: Acoustic Emissions
My plant facilities engineer just asked me if I knew anything
about acoustic noise testing. (The answer is; very little.)
He said that he was thinking about buying some clean-room air
cleaners. These are self-powered particulate filters which mount into a
drop ceiling. He said that the salesman told him that the filters had a
"53dBA sound level", measured 30" from the fan grill, at 90 FPM flow
rate. He wanted to know if I could verify that level after installation.
First, can anyone point me to any applicable light industrial
sound level spec? Maybe OSHA or Cal/OSHA. Or is there some voluntary
industry standard? Does what I described above sound familiar?
Second, 53dBA sounds (oops) really quiet to me. A few years ago,
I measured the sound level in an RF anechoic room. IIRC, I found about
55dBA. So 53dBA (from a filter/blower) must be REALLY quiet. Maybe it
wouldn't be possible to prove this low a level because of ambient noise
(other air handlers, transformer hum, outside traffic and fluorescent
lights). Any comments?
TIA,
Ed
--------------------------
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA. USA
619-505-2780
Date: 08/27/1998
Time: 15:51:51
--------------------------
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