AC SERIES/CHALLENGER/DEFENDER/AMERICAN COACH

IC Bus/Champion Bus, Inc./General Coach American, Inc. Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2012-04-18
Personnel : T.M., T.S. & E.D.
Temperature (°F) : 46 Humidity (%) : 57
Wind Speed (mph) : 7 Wind Direction : NE
Barometric Pressure (in.Hg) : 30.27
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 T.S.
Initial Sound Level Meter Calibration: true checked by T.S.
Exterior Ambient Noise Level dB(A): 35.3

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 70.4 1 71.3
2 70.2 2 71.9
3 70.0 3 72.5
4 69.7 4 71.0
5 70.0 5 72.2
Average of two highest actual noise levels = 70.3 dB(A) Average of two highest actual noise levels = 72.4 dB(A)