l
I
I EXAMPLE OF OSIIA NOISE EXPOSURE MEASUREMENT
(Based on Proposed Standard 1975)
Using tile 215 Sound Level Meter to determine OSHA compli.
ante in a constant noise environment is a simple task, Merely read
tile sound level with A scale weighting at each wm'ker's station,
Record the date, reading and worker-station. From Tahle 2 determine
tile pernlissiblo length expostu'e for the nleasttred noise level.
[;'or a varying noise environnlel31, _'ontintlous meastlremenl_s
must be taken over the work day. and the following formula must, be
solved to determine worker exposure:
Co Cn=
1C + _ + ,_ < I for total perraissible exposure1' 1 12 ' '
Whore C is the length of time at a particular measured noise level, nnd
T is tile time per (lay permitted at that noise level (from Tahle 2).
Table 2, OSHA [crmissiblc Noise Exposure
Length of Exposure- IT) Equivalent Maximum
(Hrs/Day) Noise Level (dBA)
(16) (85)
8 90
6 92
4 85
3 97
2 IO0
1_ 102
1 105
110
¼ or less 115
In order to use the Quest 215 or any other sound level inef.er in
a varying noise environment, Illluly noise nleasuremelll, s shotdd _}e
made at tile workers station --enough so that the readiags are repre-
sentative of tile workers exposure. All noise levels must be read, and
the duration at each level noted, As many as 30 or more readings
may be necessary to account for all tile noise vm.iations, floweret, in
this example we assume that only four basic noise levels are present
and that tile duration of each is shown on next page. The nlaxinltinl
exposure time (T) for each reading is also shown.
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