chapter  9
10 Pages

Vibration measurement

Vibration measurements for use in hand-arm vibration assessments are done on

the assumption that the equal energy principle gives valid predictions of the

probability of damage occurring. Hand-arm vibration meters will have this

assumption built into the software that controls the instrument, and although

some are capable of making measurements of instantaneous vibration magni-

tude, all instruments intended for these measurements also have an equal energy

averaging function (comparable to the Leq function on most sound level meters).

It is this function that is likely to be used for almost all measurements.

The terminology for hand-arm vibration measurements is less advanced

than for noise measurement, so that instrument manufacturers use a variety of

nonstandard terms on their instrument displays. Aeq and LAeq are among those

in use.