选择R6的阻值时要确保在负载电流的最高允许值的条件下，Q2的基极-发射极电压大约低于0.5V。
When choosing a value for R6, ensure that Q2's base-emitter voltage is less than approximately 0.5V at the maximum permissible value of the load current.
这是因为板电压过高，最高不超过允许的电流损耗限制太低。
This is because the plate voltage is too high, and the Max allowable current without exceeding dissipation limits is too low.
在DAQ设备与电压源或电流源连接时必须细心，以确保信号源不超过设备所允许的电压或电流最高值。
Be careful when connecting a voltage or current source to your DAQ device. Make sure the signal source will not exceed the maximum voltage or current that the DAQ device can handle.
在DAQ设备与电压源或电流源连接时必须细心，以确保信号源不超过设备所允许的电压或电流最高值。
Be careful when connecting a voltage or current source to your DAQ device. Make sure the signal source will not exceed the maximum voltage or current that the DAQ device can handle.
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