一、序言在无线电元件的测量和有关交流电的测量中,“比较测量法”是比较精确的,也是比较常用的一种方法。在这种方法的测量中,关于“平衡”的指示问题,是极其重要的,如万用电桥的平衡和交流补偿器的平衡,在测量中是最常遇到的。判别这种平衡的方法,在一般情况下,是戴上耳机子,听声音的强弱,来判定平衡与否,但是用耳机子听“嗡嗡”的声音,不仅很令人讨厌,同时还由于每个人的耳朵的“灵敏性”不尽相同,使测量的结果,也就常常不易准确。如果平衡的指示仪器是用眼睛来观察的,就可以避免了上述缺 First, the preamble In the measurement of radio components and measurement of AC, “comparative measurement method” is more accurate, but also a more commonly used method. In this method of measurement, the indication of “balance” is extremely important, such as the balance of the universal bridge and the balance of the AC compensator, which is the most commonly encountered in measurement. The way to determine this balance is to put on the earphone and listen to the strength of the sound to determine whether the balance is normal or not. However, it is not only annoying to hear the “buzzing” sound with the earphone, Because each person’s ear “sensitivity” is not the same, the measurement results, it is often not easy to accurately. If the balance of the instrumentation is observed with the eyes, we can avoid the lack of