英语翻译Besides the function and range switches (sometimes they

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英语翻译
Besides the function and range switches (sometimes they are in a
single switch),the analog meter may have a polarity switch to facilitate
reversing the test leads.The needle usually has a screw for mechanical adjust
to set it to zero and also a zero adjust control to compensate for weakening
batteries when measuring resistance.An analog meter can read positive and
negative voltage by simply reversing the test leads or moving the polarity
switch.A digital meter usually has an automatic indicator for polarity on its display．

除了功能和范围转换开关(有时他们集合于一个开关),分析仪可能还有一个极性开关以便于反转测试头.缝针通常有一个螺丝旋钮用以机械调零,同时调零控制也是测量阻力时对电池电量减弱的补充.分析仪可以通过反转测试头或移动极性开关来轻松读取正负电压.而数码测量仪通常在它的显示屏上有一个自动极性指针

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