基于NI6221卡的电机测试控制程序，由NI6221卡发脉冲控制电机转速，再由6221卡读回电机的转速信号并显示

基于NI6221卡的电机测试控制程序，由NI6221卡发脉冲控制电机转速，再由6221卡读回电机的转速信号并显示-NI6221 card-based motor test control procedures, NI6221 card issued by the pulse control motor speed, and then from 6221 card read-back motor speed signal and disp