sound meter

[Brian Young]

Yes I do. We were doing some sound testing at work and
checking the specs for meters. Went to Radio Shack.com
the accuracy is actually +/- 2DB. Not bad for $40.

I want my plane checked on the minus side of the
accuracy range...can we arrange that..lol


--- Tony Stillman <tony at radiosouthrc.com> wrote:
> Brian:
> 
> Do you realize that 3 DB is DOUBLE the sound level? 
> That's not even
> close.....
> 
> Tony Stillman
> Radio South
> 3702 N. Pace Blvd.
> Pensacola, FL 32505
> 1-800-962-7802
> www.radiosouthrc.com
> ----- Original Message ----- 
> From: "Brian Young" <b4598070 at yahoo.com>
> To: <discussion at nsrca.org>
> Sent: Monday, April 26, 2004 8:34 AM
> Subject: Re: sound meter
> 
> 
> > Do they calibrate the meter at the NATS?
> >
> > I think the RS meters are within spec if they are
> +/-
> > 3DB.
> >
> >
> > --- "ed.schummer" <ed.schummer at sbcglobal.net>
> wrote:
> > > Couldn't agree more.  Most of these meters work
> > > pretty well when measuring
> > > relative levels of pink noise, such as in
> > > calibrating control room levels to
> > > a SMPTE standard, or such.  The problem comes up
> > > when there is a dominant
> > > frequency that is much louder than the others,
> as
> > > often occurs with our
> > > planes.  We once tested a bunch of these meters,
> and
> > > although on average
> > > they were pretty good, I have seen as much as 6
> dB
> > > difference from one meter
> > > to another at single frequencies, both meters
> > > calibrated to the same level
> > > with pink noise....
> > >
> > > Ed
> > >
> > >
> > > ----- Original Message ----- 
> > > From: "Ed White" <edvwhite at yahoo.com>
> > > To: <discussion at nsrca.org>
> > > Sent: Sunday, April 25, 2004 5:22 AM
> > > Subject: Re: sound meter
> > >
> > >
> > > > At work I have access to a large acoustics
> test
> > > lab
> > > > and borrowed a portable calibrator.  My RS
> sound
> > > meter
> > > > was off up to + AND - 3 dB.  It varied
> > > considerably
> > > > with frequency.  At lower frequencies (<1 KHz)
> it
> > > read
> > > > low by 2-3 dB, at higher frequencies (>1 KHz)
> it
> > > read
> > > > high by 2-3 dB.  Pretty much varied all over
> the
> > > > place.
> > > >
> > > > The message is don't get hung up on 95 dB vs.
> 96
> > > dB.
> > > > The RS meter will give you a ballpark absolute
> > > value,
> > > > and as Earl said will give you decent relative
> > > > measurements.
> > > >
> > > > Ed
> > > >
> > > > --- "Del K. Rykert" <drykert at localnet.com>
> wrote:
> > > > > My radio shack soundmeter was off by almost
> 3 dB
> > > > > when it was calibrated.
> > > > >
> > > > >         Del
> > > > >   ----- Original Message ----- 
> > > > >   From: Earl Haury
> > > > >   To: discussion at nsrca.org
> > > > >   Sent: Saturday, April 24, 2004 9:05 AM
> > > > >   Subject: Re: sound meter
> > > > >
> > > > >
> > > > >   Steve
> > > > >
> > > > >   It matters a lot. The rules specify dB-A,
> so
> > > use
> > > > > the A scale. Without a calibrator most sound
> > > meters,
> > > > > even the expensive variety, are really only
> good
> > > for
> > > > > comparative measurements. So - use it to
> find
> > > what
> > > > > makes the airplane quieter but don't get
> fixated
> > > on
> > > > > the absolute number without a calibrated
> > > reference.
> > > > >
> > > > >   Earl
> > > >
> > > >
> > > >
> > > >
> > > >
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