>By the way, I bought this JTS-1357 sound level meter:
>
>http://www.amazon.com/Mastech-digital-sound-level-meter/dp/B00067L420
>
>I don't know much about sound meters, but it looks pretty good, even
has a 
>nice plastic carrying case.
>
>By the way, a question for those who know -- which weighting should I
use 
>for measuring equipment noise (A or C)? Why is C registering higher
noise 
>levels -- I thought it simply enabled the low-pass filter?
>
>Vitaliy 


A weighting simulates the human ear, which typically has a poor high and
low frequency response, so if you have a sound with a lot of high and
low frequency content C weighting will give a higher figure.

http://en.wikipedia.org/wiki/A-weighting

There are standards for measuring all types of noise; environmental,
noise nuisance etc, I recommend you do some digging on google if you
want to measure things correctly.

Don't expect any measurements from that meter to stand up in court
though :-(

G
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