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以前使用热电压计和热电偶电压计作为测量包含有不同频率成分的电压有效值,这些电压计不但灵敏度低、容易坏,另外消耗电力也大. 根据这个发明,有效值电压计是在T_1、T_2和R_1、R_2构成电桥的中点连接检流计G,测量信号通过变压器加到晶体管T_1的基极B_1和发射极E_1之间.在没有测量信号时,变化可变电阻P_1调整晶体管T_1的工作点,使流过检流计的电流等于零.然后加入测量信号v,如果这个电压振幅很小,电流是在发射极、基极
In the past, the use of a thermometer and a thermocouple as a measure of voltage components containing different voltage RMS, these not only the sensitivity of these voltmeter is easy to bad, in addition to power consumption is also large according to this invention, the RMS voltmeter T_1, T_2 and R_1, R_2 form the midpoint of the bridge connected galvanometer G, the measurement signal through the transformer added to the base of the transistor T_1 B_1 and emitter E_1 in the absence of the measurement signal, the variable resistor P_1 adjustment transistor T_1 Of the working point, the current flowing through the galvanometer equal to 0. Then add the measurement signal v, if the voltage amplitude is small, the current is in the emitter, the base