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本文对ND—202型精密双相锁定放大器进行了全面分析,着重推导了本仪器具有特色的传输函数曲线,阐明了本仪器的双相测量原理,并计算了本仪器对一些特殊频率信号的测量误差。
In this paper, a comprehensive analysis of the ND-202 precision two-phase lock-in amplifier is made, and the characteristic transfer function curve of the instrument is deduced emphatically. The two-phase measurement principle of the instrument is clarified and the measurement of some special frequency signals of the instrument is calculated error.