论文部分内容阅读
(三)交流自动平衡及调零电路不管属于那种测量电路,交流归还式都必须同时归还两个分量。一般用测量电路的电源相位为零作参考,则必须同时归还同电源垂直及平行的两个分量,因此它的电路无疑要比直流电路复杂得多。现在介绍一种电路,其方框图如图5。振荡器产生一定频率的正弦波电压,经分相电路输出 Esinωt 及 Ecosωt 两组正弦波,供给4只相敏检波器。另外将 Esinωt 经功放后,供给测量电路。测量电路可以是桥路、电位计电路或互感器电路,其中必然有一个或几个元件是传感器。传感器将测得的非电量信号调制在振荡器产生的载波上,测量电路的输出是一种调制波,当然载波的频率要比调制的频率高得多。
(C) the exchange of automatic balancing and zero adjustment circuit Regardless of the kind of measurement circuit, exchange return must be returned at the same time two components. Normally, the phase of the power supply of the measuring circuit is zero for reference. Therefore, the two components perpendicular and parallel to the power supply must be returned at the same time. Therefore, its circuit is undoubtedly much more complicated than the direct current circuit. Now introduce a circuit, the block diagram shown in Figure 5. Oscillator to generate a certain frequency sine wave voltage, the output of the phase-split circuit Esinωt and Ecosωt two sets of sine wave, phase-sensitive detector to provide four. In addition to the power amplifier Esinωt, the measurement circuit. The measuring circuit can be a bridge circuit, a potentiometer circuit or a transformer circuit, of which one or several elements are necessarily sensors. The sensor modulates the measured non-electrical signal on a carrier wave generated by the oscillator. The output of the measuring circuit is a modulated wave. Of course, the carrier frequency is much higher than the modulated frequency.