将静电计置于电压模式，然后打开外部反馈，就把反馈电路从内部网络切换到连在前置放大器输出端的外部反馈网络上。
Placing the electrometer in the volts mode and then enabling external feedback switches the feedback circuit from an internal network to a feedback circuit connected to the preamp output.
外部反馈模式允许使用外部器件来作静电计的反馈元件。
The external feedback mode allows an external device to be used as the feedback element of the electrometer.
讨论了FPS - MS型视象管的工作模式和三种不同结构全静电型视象管的图案电极设计及其工作性能。
The operating model of FPSMS vidicon is presented. and the pattern yoke designs for three types of all-electrostatic vidicons with different structures and their performances are discussed.
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