Sound Level meter requirements

[Earl Haury]

John

Dean's info is correct. I've an Extech 407736 meter that is IEC 651, ANSI 
S1.4 Type 2 compliant and accurate +-1.5 dB. It's a nice digital meter with 
a built in 94 dB calibrator (electronics) and is certifiable.

I've recently been developing noise limits for a local club. They purchased 
the Radio Shack digital meter and it agrees with mine with the same noise 
source. There are a couple of issues in that the range must be set on the RS 
(10 dB groups) and when switched on it defaults to C weighting and "fast" 
response - whereas A and slow is preferred. Overall though, a useable meter 
and a good value for $50 (as compared to $250 for the Extech).

Earl

----- Original Message ----- 
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Tuesday, February 15, 2005 8:41 AM
Subject: RE: Sound Level meter requirements


Hi John,
It's "A" weighting. That's the dominant "ear-like" weighting standard. It's 
also the one typically specified in property line noise ordinances.
The relatively cheap Radio Shack sound meter does this as well as several 
others.

Later,

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of John Pavlick
Sent: Tuesday, February 15, 2005 1:20 AM
To: NSRCA Discussion
Subject: Sound Level meter requirements


Does anybody know the requirements for a sound level meter capable of
testing for AMA noise requirements? I've found a few that measure A and C
weighted response. Some are IEC Type 2 compliant. Is this good enough for
AMA standards? Also, there's no spec. for the measured frequency range
requirement. All meters specify a range (i.e. 30Hz - 12KHz). What range does
an AMA approved measuring device have? There must be a list of requirements
somewhere, otherwise it's going to be a guessing game. It's not like buying
a tape measure.
 I've been thinking of getting one for several reasons. First, I want to
test some of the planes at my club field to get an idea of how much noise
the average sport model generates compared to a lawnmower or a weed whacker.
Second, I would like to include a noise measurement for the airplanes that I
write magazine reviews for. I think it would be a good idea for the general
public to see that most pattern planes are VERY QUIET - I don't think they
realize this.

John Pavlick
http://www.idseng.com

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