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Which outcome occurs when excessive backlash distorts an encoder's square wave signal in a CNC milling machine?

A)Phase shift appears incorrectly
B)Harmonic distortion increases linearly
C)Frequency doubles unexpectedly afterward
D)Signal amplitude diminishes sinusoidally

💡 Explanation

In CNC milling, backlash during rapid direction changes introduces timing errors; therefore the encoder reports incorrect phase shifts because differential encoding detects position based on quadrature decoding, rather than alternatives generating amplitude or frequency changes as continuous movement artifacts.

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