Initial unbalance is measured indirectly. A rotating unbalance generates a centrifugal force acting at the bearings. This results in vibration which is measured. For each plane an accelerometer is mounted in radial direction and connected to the inputs of the USB device.
 Vibration measurand
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Vibration can be displayed as acceleration, velocity or displacement. Most common in the machine building industry is vibration velocity which is also used in machine condition monitoring to ISO 10816.
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 Characteristic
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RMS or peak values can be measured to characterize vibration.
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 Signal source
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Selects the physical signal input for vibration of the USB device.
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 Gain
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Selects the physical gain of the USB device for vibration. Auto ranging must not be used for balancing.
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