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Click on Departments and select MSD 101. There, you'll find a library of MSD 101 articles — for fast facts on motion components and things to know when applying them. From the Mechanical PT feature:

Raw sensor signals may seem unintelligible, but a simple law of physics can help expose hidden information. The law, called superposition, states that the response (output signal) of a linear circuit (sensor) having several independent sources (stimuli) is the sum of the responses of the sources acting alone. In other words, raw sensor signals are actually the combination of many signals, stemming from electrical, mechanical, and temperature-related influences as well as the measurand itself. Isolating the desired component from the rest of the signal is aided by the fact that thermal, mechanical, and electrical dynamics are vastly different. Spurious electrical response, for example, tends to reside high in the frequency spectrum. Common causes include switching transients, interference, and noise; the solution is a low-pass filter.