scope:

This standard prescribes a method for measuring the emission sound pressure levels of machinery and equipment at work stations and other specified positions nearby, in any environment which meets certain qualification requirements. A method is given for determining a local environmental correction (the acceptable maximum value of which is prescribed) to be applied to the measured sound pressure levels to exclude the effects of reflections from reflecting surfaces other than the plane on which the machinery of equipment is placed. This correction is based upon the mean sound pressure level on a measurement surface, the sound pressure level measured at a specified position, and either an environmental indicator or the equivalent absorption area of the test room. The grade of accuracy of the measuremenets (engineering or survey) depends upon the value of the local environmental correction. This standard is applicable to all types of machines, both moving and stationary for indoor or outdoor use.