Description: 1, after the class a result of sampling shaping electronic circuit for the square wave to sine wave, so analog circuits can be directly adjustable output frequency square wave to the after-class. 2, three-phase AC motor windings as a result of power generation is 120 degrees symmetrical installation, the output waveform for the three-phase three-phase 120 degrees apart are chiral, so analog circuits must be three-phase output phase sequence corresponding square. 3, three-phase AC motors issued three-phase AC voltage phase sequence implied a motor rotation direction, so the output square wave of phase sequence should be adjustable to adapt to changes in the direction of motor rotation. 4, after the level sampling circuit for the pulse counting mode, in order to ensure the accuracy of counting, analog circuits should output 50 duty cycle for the standard square wave.
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