Paul (Notts)
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| posted on 2/12/07 at 06:22 PM |
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SVA noise test - equipment settings.
Borrowed a sound meter from work this weekend to see what noise levels the V8 makes.
The sound meter has a weighting button on it that toggles between A and C values. The instruction say – see relevant Health and safety rules to find
out what setting you use for a particular noise test.
With the weighting set to A I get a max reading 0f 98dB at 3500rpm
With the weighting set to C I get a max reading of 107 dB at 3500 rpm
Please tell me that the weighting at SVA will be the A value.
Paul
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Mr Whippy
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| posted on 2/12/07 at 06:29 PM |
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if C stuff some steal wool up the exhaust for the test.
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Howlor
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| posted on 2/12/07 at 06:30 PM |
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tried that with mine and it came out like 'chaff' from an Apache!
Steve
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orbital
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| posted on 2/12/07 at 06:50 PM |
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Where are you taking the test's Paul? You need to be in a large open area to get a decent result, that or an anechoic chamber  If your in your
garage or even on your drive with walls in fairly close proximity the reading will be off.
The weighting is the range the meter is operating in (if I remember correctly) For instance on the meter I use to calibrate my home cinema gear I use
the "C" weighting as this gives a uniform reading over 32-10,000Hz frequency range.
Cheers
Dave
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Paul (Notts)
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| posted on 2/12/07 at 07:10 PM |
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All I have managed to find on the internet is the Australian rules for exhaust testing which clearly state that weighting A is to be used on the fast
setting
I had weighting A set for the 98dB breading but had the slow setting in use but I don’t recall the last bit making much difference so I thing I should
be OK
Paul
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NeilP
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| posted on 2/12/07 at 07:11 PM |
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The SVA manual gives it as 101 dB(A) - i.e. 'A' weighted
IIRC - 'A' weighting is to the spectrum of sound that and average human ear will recieve (i.e. ear is not as effective at top and bottom
of range therefore a noise of equal pressure would 'sound' louder in the mid of the range.)
C as stated is equal across the range
HTH
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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orbital
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| posted on 2/12/07 at 07:15 PM |
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The slow setting is used for taking an average reading of sound levels and the fast is used for peak.
Cheers
Dave
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Paul (Notts)
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| posted on 2/12/07 at 07:29 PM |
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Just re checked SVA manual -it does have an (A) after the 101dB
thank god for that ..
Paul
Cheers for the quick replies
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