Sound Level meter requirements

[Lance Van Nostrand]

Earl/John,
Our club bought a RS meter and I remember Gray taking it to a contest where 
either Earl or Mike Harrison had their Extech.  The RS meter was 2 db off 
and had no calibration.  We then bought the Extech and found that the 
calibration ability and the specs are needed in a court of law.
--Lance

----- Original Message ----- 
From: "Earl Haury" <ehaury at houston.rr.com>
To: <discussion at nsrca.org>
Sent: Tuesday, February 15, 2005 9:17 AM
Subject: Re: Sound Level meter requirements


> 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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