由于两个二极管反向并联，所以此电路能够对任何极性的信号进行保护。
With two diodes in parallel back to back, the circuit will provide protection regardless of the signal polarity.
根据电压源的极性，互相并联的两个二极管(D)中的一个用来减小噪声，而另一个二极管则提供放电通路。
Depending on the polarity of the voltage source, one of the two diodes (d) in parallel is used to reduce noise while the other provides a discharge path.
本仪器测试的对象为小功率晶体管，包括：各种二极管、双极性三极管、场效应管等。
The testing objects of the instrument are low power transistors, including the common diode, the bipolar transistor, the field effect transistor and so on.
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