Text: a) The location of the shaft circumference which provides the once-per-turn occurrence to be used with the Keyphasor transducer. In can be a keyway, a key, a hole or slot, a projection, or a change in reflectivity when using an optical transducer; b) That point on the trace of an oscilloscope (vibration waveform or orbit display) which represents the Keyphasor pulse, usually a blank spot followed by a bright spot, or the reverse order. The Keyphasor event on the oscilloscope trace is obtained by using the output signal of the Keyphasor transducer as an input to the Z intensity axis on the scope.

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