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Comparing SPL Meters

2K views 3 replies 2 participants last post by  Ilkka 
#1 ·
Hi Guys,
Got my new CM-140 today and laid it side by side with my RS 33-2055 Digital. Played a number of test tones (sine waves) from 30 Hz to 5000 hz and noticed that the SPL levels at different frequencies vary as much as 20 db! Could this be a bad meter? Which one? I'll try to chart them out this weekend and see what the difference is. Any thoughts or am I missing something.
 
#4 ·
Comparing frequencies higher than 100-200 Hz is very difficult unless you know what you are doing. But for low frequencies you can just plug them to your computer and run a few REW sweeps. Plain sine waves are also ok there, although you should still place both mics side by side. Use the same weighting for both (C-weighting).
 
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