Originally posted by: Zim Hosein
Originally posted by: tm37
OK a couple of things.
Most meter will not go below 30 without some sort of octave band filtering.
Why do you need to measure so low? Normal room noise is usually ~40dB SPL.
For decent and CHEAP acurate Meters I would look to the quest or larson davis meters (sometimes they can be found on ebay)
If you need to measure that low you are going to be looking at a 1K microphone and unless you are in some sort of sound reducing room you will just see noise unless you filter on the frequecy of the fan.
Also if there are florencent lights you can 50dB of noise that you rmeter will pick up in the 60Hz range (I have actually seen this in the 60dB range)
To measure the sound of you fans you are going to need a pretty high presion meter and microphone and it more than likely is not worth the money you will need to spend to get an accurate reading.
Sorry to be the bearer of Bad news but there is a reason My friend is billing out $300 an hour to take acoustical measuments.
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