广义地说，与仪表的反馈阻抗相比，源阻抗应当比较大。

In broader terms, the source impedance should be large compared to the feedback impedance of the meter.

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这个反馈被连接到下游的三极管Q1，此电源电压的特性，对阻抗的变化很敏感。

This feedback being connected downstream Q1 transistor, the general behavior of this voltage supply is very sensitive to sensor impedance variation.

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图2 - 37示出连至源阻抗的一般反馈电路。

Figure 2-37 shows a generalized feedback circuit connected to a source impedance.

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