Extech Instruments 407355 Guide de l'utilisateur télécharger pdf (Page 11)

407355-en-GB_v3.1 01/15

Conversion Charts

OSHA Permissible Noise Exposures

Duration per day, hours Sound level dBA, slow response

8 90

6 92

4 95

3 97

2 100

1.5 102

1 105

0.5 110

0.25 or less 115

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 TWA (dBA)

50 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

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Extech Instruments 407355 Guide de l'utilisateur Page 11