In this study, an SLM (TES-52 SOUND LEVEL
METER) was mounted 1.2 m above the ground surface
and 7.5 m away from the center of the tractor path way in
a horizontal position and pointed in the direction of travel.
To measure the noise near the operator’s ears, the
microphone of dosimeter (Model TES-1354/1355) was
attached to the operator’s clothes. The SLM and
dosimeter calibration was performed by using TES-1356
sound level calibrator before data gathering.