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目前国内电阻、电容测量丧的小型化、数字化已基本普及,而电感测量表的小型化、数字化尚未普及。本文以微分原理:V_L=-L△l/△t,即L=KV_L为基础,研制了简易数字式电感测量表,整个仪表由信号源、测量环节、检波、尺度放大、数字显示几个部分组成,由方波发生器产生一个10kHz的信号,V_(pp)=5V,通过整形,一路输出作测量信号,另一路经二分频得5kHz的方波信号,因分频产生毛刺,加一级整形(以下各级分频后相同),使波形上下沿平坦,输出一路作测量信号。再经过五分频,后再经十分频得100Hz的方波信号作测量信号,故共育三个测量信号供选择使用。测量信号通过测量环节。由于三极管的开关特性及电感的自感现象,使三极管处于导通和截止状态,对输出电容充放电,输出一个尖脉冲信号。尖脉冲信号由峰值检波器检波得到一直流信号。经尺度放大器得到与电感值对应的电流信号,加到显示表头显示读数值。这电感测量表电路结构简单、体积小、读数直观测量方便,并达到一定的精度。
At present, the miniaturization and digitalization of resistance and capacitance measurement in our country have basically popularized, and the miniaturization and digitization of the inductance measurement table have not been popularized yet. In this paper, based on the principle of differential: V_L = -L △ l / △ t, that is L = KV_L based on the development of a simple digital inductance measurement meter, the instrument from the signal source, measurement, detection, scaling, digital display of several parts , A square wave generator to generate a 10kHz signal, V_ (pp) = 5V, through the plastic, all the way to the output for the measurement signal, the other way by the second frequency of 5kHz square wave signal, due to frequency glitch, plus a Level shaping (the same after the following levels of frequency division), so that the waveform along the flat, output all the way to measure the signal. And then after five frequency, and then by the very frequency of 100Hz square wave signal for measurement signal, so a total of three measurement signals for alternative use. Measurement signal through the measurement session. Due to the transistor switching characteristics and inductance of the self-inductance phenomenon, the transistor is on and off state, the output capacitor charge and discharge, the output of a spike signal. The spike signal is detected by the peak detector to obtain a DC signal. The scale amplifier and the inductor value corresponding to the current signal is added to the display meter display readings. This inductance measurement table circuit structure is simple, small size, easy to read intuitive measurement, and to achieve a certain accuracy.