一、前言非线性失真系数测量仪器本身的发展主要有两方面。其一是扩展测量频段及降低小失真系数的测量下限;其二是半自动或全自动调谐的数字化失真仪。自动失真仪主要应有下列功能:1.输入电平调整自动化和电压表量程自动化;2.表头读数数字化和频率显示数字化; I. Introduction Nonlinear distortion factor measurement instrument itself has two main aspects of development. One is to extend the measuring band and lower the lower limit of measurement of the small distortion factor; the other is the semi-automatic or fully automatic digital distortion detector. Automatic distortion device should have the following main features: 1. Input level adjustment automation and voltmeter range automation; 2. Meter digitization and frequency display digital;