zero object

MCU get timing reference by zero-crossing detection. It compare the current speed feedback with the object feedback, and control the conduction phase and time using PWM mode to realize the stable speed-regulating of AC PG-motor.

单片机通过过零检测获取计时基准，比较当前转速反馈与目标反馈，采用脉宽调制PWM方式来控制三端双向可控硅开关器件的导通相位角及导通时间，实现交流PG电机的平稳调速。

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But general design of VI only considers the specific test task and functions, which results in developed VI with poor interchangeability and flexibility. When test task or test object changes, the VI has almost zero reusability.

然而目前虚拟仪器的开发设计仅针对特定的测试任务和测试功能，所设计的测试软件通用性、可互换性差，如果被测对象或测试任务发生改变，则软件的可重用性就几乎为零。

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So suppose here is the object at time t equals zero.

假设此处就是物体，在t=0时的位置。

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When the object is here it is again zero at this moment in time.

而当物体移动到这里时，其速度也为0，对应着这个时刻。

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In all, 240 endpoints are available for use within any ZigBee device, with endpoint zero dedicated to the ZigBee Device Object ( ZDO), which provides control and management commands.

端点定义了在某个应用中一个设备的通信实体。例如，一个遥控器可能利用端点。

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