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how do you measure decibels?

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I was wondering what kind of device and where you can buy one at to measure the decibel level on a bike.

Thanks

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white bros makes one...like 250$ though

dang $250 i will find one somewhere else

or how do i check it?

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45 degrees off center, 20" away from the end of the pipe, in neutral with rider sitting on bike.

This meter:

http://www.radioshack.com/product/index.jsp?productId=2103667&cp=&sr=1&origkw=sound+meter&kw=sound+meter&parentPage=search

has been tested with the local OHVs sound meter a few times. Within a dBA or 2 every when measured next to a rangers meter. The bike is tested at a specific rpm to get the reading - varies with the bike. Lawn mower shops have been known to sell vibration tachometers similar to what the OHV parks use.

.

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the rad shack ones work well, I have one to do some audio mixing part time and they read within 1 - 2db's of the expensive ones. get the digital one it is easier to read. Also when you first turn them on, they default to "c" scale, the db reading on bikes I have seen is "a" scale, just press the "weighting" button to change to "a" scale. when i first got my 99 yz400f with a white bros "E" with 7 plates it was 98dba at idle, it would make your ears ring for days !!!!!!!!!!!!!!!!

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I got the radio shack DB meter ($49.00) to test and a Sendec hour/tach meter ($39.00) I installed on my XR. Got the tach from Cabelas (http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0015240015383a&type=product&cmCat=search&returnPage=search-results1.jsp&QueryText=sendec&N=4887&Ntk=Products&Ntx=mode+matchall&Nty=1&Ntt=sendec&noImage=0)

Mounted the tach on the bar mounts on a stainless bracket I made.

The manual says it's accurate within +/- 2 DB at 114 db. Better than nothing.

There is a standard here on how to do the testing:

http://ohv.parks.ca.gov/pages/1140/files/j1287_199807.pdf

Played with the meter but haven't tested the bike yet, but should within a week.

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I got the radio shack DB meter ($49.00) to test and a Sendec hour/tach meter ($39.00) I installed on my XR. Got the tach from Cabelas (http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0015240015383a&type=product&cmCat=search&returnPage=search-results1.jsp&QueryText=sendec&N=4887&Ntk=Products&Ntx=mode+matchall&Nty=1&Ntt=sendec&noImage=0)

Mounted the tach on the bar mounts on a stainless bracket I made.

The manual says it's accurate within +/- 2 DB at 114 db. Better than nothing.

There is a standard here on how to do the testing:

http://ohv.parks.ca.gov/pages/1140/files/j1287_199807.pdf

Played with the meter but haven't tested the bike yet, but should within a week.

Good info, Thank you.

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