Conversion Charts - Extech Instruments 407355-NIST User Manual

Conversion Charts

OSHA Permissible Noise Exposures
Duration per day, hours
Source:29 CFR 1910 Table G-16
Conversion from Percent Noise Exposure or Dose to 8-Hour Time Weighted Average Sound
Level(TWA)
Note: Assumes 5-dB exchange rate and 90-dBA Criterion
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8
6
4
3
2
1.5
1
0.5
0.25 or less
Dose or percent
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
ISO-9001 Certified
11
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
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