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<DIV><FONT face=Arial size=2>Del:<BR>The problem with all meters I know of is
that they all change! I was the first one in the USA to work with the FAI
in establishing how a db check would actually be done in the field. I did
the first ones at the 1983 US Team Selections in Rough River, KY right before
the 1983 World Champs. As I was the assistant CD for the WC, AMA wanted me
to gather the data and learn how the system the FAI had designed would really
work in the field. We found that even expensive db meters developed
drift.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The expensive versions used by AMA have to be
adjusted about every 4 hours, as they can drift 1/2 to 1 1/2 db in that period
of time due to temperature changes. That is the problem with any
meter. Unless you have a calibrator to adjust the meter, it is really
pretty worthless in getting an accurate measurement. As long as + or - 5
db is OK, you don't need to worry. However, if you are trying to meet any
model noise requirement out there, your really spinning your wheels.
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>Tony Stillman<BR>Radio South<BR>3702 N. Pace Blvd.<BR>Pensacola, FL
32505<BR>1-800-962-7802<BR><A
href="http://www.radiosouthrc.com">www.radiosouthrc.com</A></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=drykert2@rochester.rr.com href="mailto:drykert2@rochester.rr.com">Del
K. Rykert</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 16, 2005 12:01
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Sound Level meter
requirements</DIV>
<DIV><BR></DIV>
<DIV><STRONG><FONT face=Arial size=2>I had a friend calibrate my
R.S. meter. it was off 2dB. Not inferring that it is best meter. Just they can
be adjusted. How well it hold the adjustment I have no
clue.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=Arial size=2></FONT></STRONG> </DIV>
<DIV><STRONG><FONT face=Arial size=2>
Del</FONT></STRONG></DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 16, 2005 8:45
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Sound Level meter
requirements</DIV>
<DIV><BR></DIV>
<DIV>Good point.</DIV>
<DIV> </DIV>
<DIV>For my use (making comparisons) the RS meter is fine. The club I
formerly belonged to also used them for enforcing a club-imposed noise
limit.</DIV>
<DIV> </DIV>
<DIV>However, if it comes down to enforcing a local noise ordinance, a
calibrated meter traceable to NIST would probably be required. I'm not sure,
but I don't see why you would not be able to have a RS meter calibrated,
although I am sure the measurement uncertainty would not be very good. I'm
sure the calibration would probably cost more than the RS meter.</DIV>
<DIV> </DIV>
<DIV>What are/were the circumstances of "needed in a court of law" are you
referring to?</DIV>
<DIV> </DIV>
<DIV>Bob R.<BR><BR><B><I>Lance Van Nostrand
<patterndude@comcast.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Earl/John,<BR>Our
club bought a RS meter and I remember Gray taking it to a contest where
<BR>either Earl or Mike Harrison had their Extech. The RS meter was 2 db
off <BR>and had no calibration. We then bought the Extech and found that
the <BR>calibration ability and the specs are needed in a court of
law.<BR>--Lance<BR><BR></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>