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在遥测设备中,常常要用到两种极性的电源来供电。例如要传两种极性的信号时,模拟开关的控制信号往往就要正负两种极性的电平,又如在使用运算放大器的场合,也往往要正负两种极性的电源供电,再如线路需要反向偏置时也需要反极性的电源供电。总之,由于种种需要,两种极性的电源有时是不可避免的,而外部电源往往只有一种电源如+27伏,其余电源则要经过机内变换获得,否则就要单独设计一组电源来供给。这常常引起设计人员的苦恼。
In telemetry equipment, it is often necessary to use two polar power supplies. For example, to pass two kinds of polarity signal, the analog switch control signal tends to be positive and negative polarity of the two levels, but also in the case of the use of operational amplifiers, but also often have two positive and negative power supply , Another example is the need to reverse bias line also need reverse polarity power supply. In short, due to various needs, two polarity of the power supply is sometimes inevitable, while the external power supply is often only one power supply, such as +27 volts, the rest of the power will have to be transformed by the machine, or have to design a separate power supply supply. This often caused the designer's distress.