使每个连续的光电倍增管电极的电压都比它前面一个电极的电压更高，这样电子就得到加速。

Electrons are accelerated by making the voltage of each successive dynode of the tube more positive than the previous one.

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做到这一点最容易的方法是给整个光电倍增管的两端加上一个电压，然后从一个分压器的各个抽头取得供给各个倍增管电极的电压，如图4 - 13所示。

The easiest way to accomplish this is to apply a potential across the entire tube and tap the dynode voltages off a voltage divider, as shown in Figure 4-13.

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皮安计在最后一个倍增管电极处读取电流，此电流等于阳极电流减去流过前一个倍增管电极的电流。

The picoammeter reads the current at the last dynode, which is equal to the anode current minus the current flowing to the previous dynode.

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