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用表头显示的检测设备,往往感到指针摆动小,不便于观察。如果增加放大级,会带来许多问题,特别是弱信号输入。采用简单的稳压管降压,去掉直流电压,可以扩大表头指示。变化缓慢的信号,用电容隔直流是难以实现的,用稳压管比较简单。如一部检测仪,正常工作时,输出+7伏,信号偏差摆动在+6伏到+8伏之间,表头满刻度为15伏。为了扩大指示,在输出回路中串接一个2DW7C稳压管,降压约6伏,表头改成满刻度为2伏(改变表内
With the first test equipment display, often feel the pointer swing small, not easy to observe. If you increase the amplifier stage, will bring many problems, especially weak signal input. Regulators with a simple buck, remove the DC voltage, you can expand the header instructions. Slow changes in the signal, using DC blocking capacitor is difficult to achieve, with the regulator is relatively simple. Such as a detector, normal work, the output +7 volts, the signal deviation swing between +6 volt to +8 volts, the meter full scale is 15 volts. In order to expand the instructions in the output loop in series with a 2DW7C regulator, step down about 6 volts, the header is changed to full scale 2 volts (change the table