Sound Level meter requirements

[Dean Pappas]

John,
Those are words of wisdom!
The goal of our efforts should be to prevent that first complaint.
Regards,

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 Ferrell
Sent: Wednesday, February 16, 2005 10:27 AM
To: discussion at nsrca.org
Subject: Re: Sound Level meter requirements


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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