Sound Level meter requirements

[John Ferrell]

The difference in the RS and a professional tool is about what I would 
expect.
By the time you get to court with a model airplane noise complaint you have 
probably lost anyway.


John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Tuesday, February 15, 2005 10:54 PM
Subject: Re: Sound Level meter requirements


> 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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