【摘要】 PCI-1780定时器卡是一款多通道计数器/定时器卡。针对光栅尺数据采集中定时功能的需要,提出采用采集卡内部晶振定时。由于硬件计时常常需要外接信号源作为频率触发,依赖于外部硬件,不易实现。提出一种采用定时器卡内部晶振进行频率输出的方法实现定时功能,优点是不需要外接信号源,即不需要外接接线板,实现简捷。定时模块基于Visual C++实现,实验结果满足预期定时功能。经实验验证,定时模块运行良好,达到定时精度要求。更多还原

【Abstract】 PCI-1780 card is a multi-channel counter/timer card.When applying hardware timing function,external trigger signal source is needed as frequency.This paper presents a timer method using internal oscillator as frequency output to achieve timing function.The advantage is external signal source or external wiring board is not needed for this method.Visual C++is applied for implementation.Results shows the timing function can be realized.The experiments proved this method running well and precision reached to target.更多还原