Measurement Considerations; Frequency Weighting Curves; Osha Permissible Levels - Extech Instruments SL120 User Manual

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

0
-10
-20
-30
-40
-50
20 50 100

OSHA permissible levels

Permissible Noise Exposure Limits
Duration per Day (hours)
16
8
6
4
3
2
1-1/2
1
1/2
¼ or less
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com
Weighting Response Curves
C
A
200
500 1k 2k
Frequency (Hz)
Sound Level db(A) Slow response
7
5k 10k 20k
85
90
92
95
97
100
102
105
110
115
Version 1.2 9/05