D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Stationary

Date : 2004-11-11
Personnel : T.S., R.S., and R.C.
Temperature (°F) : 56 Humidity (%) : 45
Wind Speed (mph) : 8 Wind Direction : sw
Barometric Pressure (in.Hg) : 30.1
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): 42.8

Accessories and Air Conditioning ON
Throttle Position Engine RPM Curb (Right) Side dB(A) Street (Left) Side dB(A)
Measured Measured
Low Idle 700 65.9 64.8
High Idle 949 67.5 66.5
Wide Open Throttle 2120 75.2 74.7

Accessories and Air Conditioning OFF
Throttle Position Engine RPM Curb (Right) Side dB(A) Street (Left) Side dB(A)
Measured Measured
Low Idle 701 64.2 63.0
High Idle 950 66.4 65.2
Wide Open Throttle 2120 74.3 74.5