General Regulations, Exceptions and Modifications
Frequency Band (cycles per second) | Sound-Pressure Level (decibels re 0.0002 microbar) |
|---|---|
20 to 75 | 69 |
75 to 150 | 54 |
150 to 300 | 47 |
300 to 600 | 45 |
600 to 1,200 | 41 |
1,200 to 2,400 | 34 |
2,400 to 4,800 | 31 |
4,800 to 10,000 | 28 |
Type of Operation/Character of Noise | Correction in Decibels |
|---|---|
Daytime operation only | +5 |
Noise source operated less than 20% of the time | +5* |
Noise source operated less than 5% of the time | +10* |
Noise source operated less than 1% of the time | +15* |
Noise of impulsive character (hammering, etc.) | -5 |
Noise of periodic character (hum, screech) | -5 |
NOTES: | |
|---|---|
* Applying one of these corrections only. | |
The sound-pressure level shall be measured with a sound-level meter and an octave bank analyzer that conforms to the latest specifications published by the American Standard Association, New York, New York. |
General Regulations, Exceptions and Modifications
Frequency Band (cycles per second) | Sound-Pressure Level (decibels re 0.0002 microbar) |
|---|---|
20 to 75 | 69 |
75 to 150 | 54 |
150 to 300 | 47 |
300 to 600 | 45 |
600 to 1,200 | 41 |
1,200 to 2,400 | 34 |
2,400 to 4,800 | 31 |
4,800 to 10,000 | 28 |
Type of Operation/Character of Noise | Correction in Decibels |
|---|---|
Daytime operation only | +5 |
Noise source operated less than 20% of the time | +5* |
Noise source operated less than 5% of the time | +10* |
Noise source operated less than 1% of the time | +15* |
Noise of impulsive character (hammering, etc.) | -5 |
Noise of periodic character (hum, screech) | -5 |
NOTES: | |
|---|---|
* Applying one of these corrections only. | |
The sound-pressure level shall be measured with a sound-level meter and an octave bank analyzer that conforms to the latest specifications published by the American Standard Association, New York, New York. |