By making use of the general relations between input and output currents and voltages in four-terminal networks of bilateral impedances a relationship is derived between the velocity response of a reversible vibration pick-up and the velocity output of the same device, when used as a source of mechanical vibrations. It is then shown that any vibration pick-up may be calibrated in absolute terms as a function of frequency by purely electrical measurements (input current and output voltage) made on the given pick-up, an auxiliary reversible pick-up, and a variable frequency driver.

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