D4500

MOTOR COACH INDUSTRIES Pdf Download PDF Report

Exterior Noise Test

Stationary

Date : 2001-07-27
Personnel : S.C., B.S. & M.H.
Temperature (°F) : 72 Humidity (%) : 37
Wind Speed (mph) : Wind Direction : Calm
Barometric Pressure (in.Hg) : 30.3
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): 34.0

Accessories and Air Conditioning ON
Throttle Position Engine RPM Curb (Right) Side dB(A) Street (Left) Side dB(A)
Measured Measured
Low Idle 600 64.9 65.3
High Idle 1499 74.7 71.4
Wide Open Throttle 2200 84.0 76.6

Accessories and Air Conditioning OFF
Throttle Position Engine RPM Curb (Right) Side dB(A) Street (Left) Side dB(A)
Measured Measured
Low Idle 603 64.5 64.7
High Idle 1500 70.4 72.1
Wide Open Throttle 2209 74.8 76.5