Shaker Amplifiers
A power amplifier is always needed to provide the necessary energy to drive the shaker. Many considerations come into play when selecting the right power amplifier for the shaker. As elec- trodynamic shakers are usually low-impedance devices, one must ensure the amplifier selected can indeed drive the shaker to its desired performance. Compatibility between the shaker and ampli- fier is fundamental along with other requirements such as broad frequency range, low-frequency response, power rating, power efficiency, low harmonic distortion, safety features, interlocks, etc. Using a power amplifier made or recommended by the shaker manufacturer is the safe choice; it typically guarantees the perfor- mance characteristics of the shaker system (sine or random force capability), which can only be stated once a shaker and amplifier pair is selected.