3000T TRANSIT TROLLEY TB-2142 CHASIS

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Exterior Noise Test

Accelerating from Standstill

Date : 1992-05-18
Personnel : B.L., B.R., B.S. & D.L.
Temperature (°F) : 73 Humidity (%) : 66
Wind Speed (mph) : 8 Wind Direction : NE
Barometric Pressure (in.Hg) : 28.2
Verify that microphone height is 4 feet, wind speed is less than 12 mpg and ambient temperature is between 30 F and 90 F: true checked by B.L.L.
Initial Sound Level Meter Calibration: true checked by B.L.
Exterior Ambient Noise Level dB(A): 60.1

Accelerating from Constant Speed
Curb (Right) Side
Accelerating from Constant Speed
Street (Left) Side
Run # Measured Noise Level dB(A) Run # Measured Noise Level dB(A)
1 81.4 1 79.5
2 81.4 2 79.9
3 3
4 4
5 5
Average of two highest actual noise levels = 81.4 dB(A) Average of two highest actual noise levels = 79.7 dB(A)