Move with the X axis micrometric movement the sharp shadow, till the digitalcomparator red light is on the zero right position.
微调移动X 轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
2
The output of the FPGA is typically a waveform with a fixed-frequency, variable-duty cycle, which a counter and a digitalcomparator generate (Listing 1).
FPGA的输出是固定频率、计数器和数字比较器使占空比可变的典型波形(表1)。
3
The digitalcomparator designed with FPGA generates several PWM current waveform synchronously, to realize the step angles even division control for four-phase stepping motor.