Acceleration and Displacement can also be expressed on dB scales. The AdB scale is the most used one, and its zero reference is set 1 micro G, commonly abbreviated G.
It turns out that AdB = VdB at 159.2 Hz. VdB levels, AdB levels, and DdB levels are related by the following formulas:
Acceleration and Velocity in linear units are calculated from dB levels as follows:
Note that the time domain wave form is always represented in linear amplitude units - it is not possible to use a log scale in the wave form plot because some of the values are negative, and the logarithm of a negative number is not defined.
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