MB55 CHASSIS

FREIGHTLINER CUSTOM CHASSIS CORP Pdf Download PDF Report

Exterior Noise Test

Accelerating from Standstill

Date : 2006-03-06
Personnel : B.S., T.S. & S.C.
Temperature (°F) : 38 Humidity (%) : 37
Wind Speed (mph) : 3 Wind Direction : NW
Barometric Pressure (in.Hg) : 30.0
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: true checked by S.C.
Exterior Ambient Noise Level dB(A): 39.2

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 72.4 1 72.1
2 72.5 2 72.8
3 71.8 3 72.9
4 72.1 4 72.7
5 71.8 5 72.7
Average of two highest actual noise levels = 72.5 dB(A) Average of two highest actual noise levels = 72.9 dB(A)