Zero adjustment function, forward adjust is forward biased, reverse adjust is reverse biased.
零点调整功能，顺时针调整可以偏负，逆时针调整可以偏正。
In typical operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased.
在正常工作中，发射结正向偏置，基集电结反向偏置。
When the diode is reverse biased, only a negligibly small leakage current flows through the device until the reverse breakdown voltage is reached.
当二极管反向偏置时，仅有很小的、可忽略的漏电流流过，除非是达到反向击穿电压。
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