在现代的静电计中，前置放大器输出端就是这样的一个节点，并可以用来降低电缆泄漏的影响，如图2 - 5所示。
In modern electrometers, the preamplifier output terminal is such a point, and can be used to reduce the effect of cable leakage, as shown in Figure 2-5.
最后，分析了进一步降低功率放大器的功耗、提高效率、提高可靠性，减小功放体积的可能性。
Finally, the author analyzes the possibility to cut down power waste of amplifier further, improve the efficiency and reliability, decrease the volume of power amplifier.
R2和R4用来降低因输入失调电流产生的误差，其原理与前文光电二极管放大器所述一致。
R2 and R4 are chosen to minimize errors due to input offset current as outlined in the section describing the photocell amplifier.
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