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计数器的连接线直接连接在了DAQ-STC计数器芯片上,这个芯片上的VCC和GND连接了保护二极管来确保信号不会过载。当电源关闭时,VCC变为了0V,而且保护二极管与VCC进行着连接。为了避免对板卡或者计算机造成损害,当E系列板卡断电后,输入电压需要保证在0.5V一下。
你可以通过外部电路在板卡上添加一个电阻来限制电流。计算所需电阻的公式为V/I = R ,保证电流I小于10mA,例如(5 volts)/(10 mA) =500 ohm 的电阻。注意你不需要对所有的信号都这样做,你只需要对被配置为输入的信号并且这些信号电流大于10mA进行如上的操作。任何大于10mA的电流都有可能损坏你的 DAQ-STC
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