407355 Datasheet, PDF (16/17 Pages) Extech Instruments Corporation. – Noise Dosimeter with PC Interface

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