Extech Instruments SL120 - Measurement Considerations; Frequency Weighting Curves; OSHA Permissible Levels

Version 1.2 9/05
7
20
50
100
2k1k 5k
10k 20k
200
500
-20
-30
-40
-50
-10
A
0
C
Frequency (Hz)
Weighting Response Curves
Measurement Considerations
1. Use a windscreen (not included) to cover the microphone in windy conditions.
2. Calibrate the meter often, especially if the meter has been idle for a long period of time.
3. Do not store/operate the meter in areas of high temperature or humidity.
4. Keep the meter and the microphone dry.
5. Avoid severe vibration when using the meter.
6. Remove the battery when the meter will be stored for long periods of time.
Frequency Weighting curves
OSHA permissible levels
Permissible Noise Exposure Limits
Duration per Day (hours) Sound Level db(A) Slow response
16 85
8 90
6 92
4 95
3 97
2 100
1-1/2 102
1 105
1/2 110
¼ or less 115
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