Abstract
A field survey was carried out for the purpose of the establishment of measuring method of vibration caused by portable vibrating tools and clsssification of tools with regard to grades of their vibration magnitude. More than one hundred tools includ-ing electric, gasoline engine and pneumatic tools were investigated. Vibration ac-celeration levels (dBAL) and vibration levels (dBVL) which were values weighted with an electric circuit corresponding to human hand vibration sensation, and fre-quency spectra were determined on these tools. A reasonable measuring method of vibration could be proposed through the experiences and practical situation of the tools could be grasped.
