The scope of this standard includes measurement of mobility,accelerance,or dynamic compliance,either as a driving-point measurement,or as a transfer measurement.It also applies to the determination of the arithmetic reciprocals of those ratios such as free effective mass.Although excitation is applied at a single point,there is no limit on the number pf points at which simultaneous measurements of the motion response may be made.Multiple response measurements are required,for example,for modal analyses.