Extech Instruments 407355 User Manual page 16

Conversion Charts
OSHA Permissible Noise Exposures
Duration per day, hours
0.25 or less
Source:29 CFR 1910 Table G-16
Conversion from Percent Noise Exposure or Dose to 8-Hour Time Weighted Average
Sound Level(TWA)
Dose or percent
Note: Assumes 5-dB exchange rate and 90-dBA Criterion
8
6
4
3
2
1.5
1
0.5
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
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Sound level dBA, slow response
90
92
95
97
100
102
105
110
115
TWA (dBA)
85.0
85.7
86.3
86.9
87.4
87.9
88.4
88.8
89.2
89.6
90.0
90.4
90.7
91.1
91.3
91.6
407355 Version 2.4 9/07