A painful, recent rejection - a long relationship ending suddenly against his wishes, perhaps - might be one reason why he's hesitant to put himself on the line.
This added voltage is mainly power line frequency and its effect on the voltmeter reading will depend upon the normal-mode rejection capability of the meter.
这个相加的电压主要为电源频率的信号，其对于电压表读数的影响决定于电压表的串模抑制能力。
3
The piecewise corrected current generator also forms negative feedback to improve the line regulation and power supply rejection(PSR).