This standard specifies the A-weighted acoustic power level of the ambient noise generated by earthmoving machinery when it is operating under the dynamic test conditions specified in Annex A, Annex B, Annex C, or Annex D. This stipulates the method of calculating by converting it into Bel.
JIS A 8317-1:2001 history
2010JIS A 8317-1:2010 Earth-moving machinery -- Determination of sound power level -- Dynamic test conditions
2001JIS A 8317-1:2001 Acoustics -- Measurement of exterior noise emitted by earth-moving machinery -- Dynamic test conditions