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国内生产的许多医用诊断仪器,为提高输入电阻,提高整机抗干扰能力,放大器前级采用电子管组成其差动放大电路,这类放大电路要求两只管子的特性有较高的一致性,以抑制环境中的干扰,维修人员在工作中有时会遇到检查两个管子是否一致的情况,由于目前测量电子管的仪器极少,故常使工作无法进行,本文介绍一种用晶体管图示仪测量电子管的方法。
Many domestic medical diagnostic instruments, in order to improve the input resistance, improve the anti-interference ability of the whole machine, the amplifier is composed of the former tube differential amplifier circuit, such amplification circuit requires two tubes of the characteristics of a higher consistency to Inhibit the interference in the environment, maintenance personnel sometimes encountered in the work of checking whether the two tubes are the same, as the current measurement of the tube of the instrument is very small, so often make the work can not be carried out, this article describes a transistor with a tube measuring instrument Methods.