只有一个输入的数字电路单元是缓冲器或反相器，而输入在一个以上的则称为逻辑门。
Only one input of the digital circuit unit is the buffer or inverter, the input in more than one are called logic gates.
仪器内部电路和内部的偏移电压会在仪器的输入端引起输入偏置电流。
The input bias current flows at the instrument input due to internal instrument circuitry and the internal bias voltage.
X1探头﹕没有衰减﹐输入阻抗跟示波器输入阻抗一样(通常是1兆欧)。由于对测试电路有很大的负载影响﹐所以很少使用这种探头。
X1 probe: no attenuation, input impedance follow that of scope input impedance (usually 1 Mohm). This type of probe is seldom used because of heavy loading effect on circuit under test.
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