It has the welding current feedback circuit and the welding voltage feedback circuit.
具有焊接电流反馈控制电路及焊接电压反馈控制电路。
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.
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。
Figure 2-37 shows a generalized feedback circuit connected to a source impedance.
图2 - 37示出连至源阻抗的一般反馈电路。
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