Noise Criterion Curves - Mitsubishi Electric PKA Series Service Manual

5

NOISE CRITERION CURVES

5-1. SOUND LEVELS
Measurement location
* Measured in anechoic room.
5-2. NOISE CRITERION CURVES
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
Approximate minimum
audible limit on
20.0
continuous noise
15.0
10.0
63 125
1.0m
High
Low
250 500 1k
Octave band center frequencies (Hz)
PKA-RP35, 50HAL
NC-60
NC-50
NC-40
NC-30
NC-20
2k 4k 8k
7
Sound level at anechoic room : Low-Middle-High
Sound level dB (A)
36 - 40 - 43