Performance Standards and Design Criteria
Frequency Band Cycles (per second) | Sound-Pressure Level (decibels re 0.0002 microbar) | |
20 - 75 | 72 | |
75 - 150 | 67 | |
150 - 300 | 59 | |
300 - 600 | 59 | |
600 - 1,200 | 46 | |
1,200 - 2,400 | 40 | |
2,400 - 4,800 | 34 | |
4,800 - 9,600 | 32 |
Type of Operation or Character of Noise | Correction (in decibels) | |
|---|---|---|
Daytime operation only | +5 | |
Noise source operates less than 20% of the time | +5* | |
Noise source operates less than 5% of the time | +10* | |
Noise source operates less than 1% of the time | +15* | |
Noise of impulsive character (hammering, etc.) | -5 | |
Noise of periodic character (hum, screech, etc.) | -5 |
* Apply any of these corrections only. |
Performance Standards and Design Criteria
Frequency Band Cycles (per second) | Sound-Pressure Level (decibels re 0.0002 microbar) | |
20 - 75 | 72 | |
75 - 150 | 67 | |
150 - 300 | 59 | |
300 - 600 | 59 | |
600 - 1,200 | 46 | |
1,200 - 2,400 | 40 | |
2,400 - 4,800 | 34 | |
4,800 - 9,600 | 32 |
Type of Operation or Character of Noise | Correction (in decibels) | |
|---|---|---|
Daytime operation only | +5 | |
Noise source operates less than 20% of the time | +5* | |
Noise source operates less than 5% of the time | +10* | |
Noise source operates less than 1% of the time | +15* | |
Noise of impulsive character (hammering, etc.) | -5 | |
Noise of periodic character (hum, screech, etc.) | -5 |
* Apply any of these corrections only. |