D4000 N

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2002-08-15
Personnel : E.D., T.S., & B.S.
Temperature (°F) : 82 Humidity (%) : 63
Wind Speed (mph) : 2 Wind Direction : W
Barometric Pressure (in.Hg) : 30.18
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 S.C.
Initial Sound Level Meter Calibration: false checked by S.C.
Exterior Ambient Noise Level dB(A): 41.3

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 77.3 1 77.2
2 77.6 2 77.4
3 77.1 3 77.7
4 77.5 4 77.7
5 77.6 5 77.3
Average of two highest actual noise levels = 77.6 dB(A) Average of two highest actual noise levels = 77.7 dB(A)