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