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利用高频振汤器的装置来指示容量分析的滴定终点的研究,近年来得到很大的发展。本文目的在介绍一种化钱不多,稳定度高,灵敏度大,操作时手续简单的装置,便於一般实验应用。本装置基本上系根据Alexander,Bender及Fisher三氏用来测定介电常数的晶体振汤电路,其后又经Hall氏改良用为高频滴定的装置。由於作者等应用了电位计代替真空管伏特计,使准确度及复演性等都有所改进。本装置利用6E5管中的三极管部分作为振汤管,电眼部分指示振汤情况。振汤器为晶体振汤器,振汤线路与调屏调栅式振荡器相似,但栅极调谐电路以晶体代替。晶体在共振荡时可以给出一固定的频率。我们所用的晶体的频率为3.24 M.C.在我们设计中将栅漏改为一个固定电阻及一个可变电阻,从可变电阻二头用引线接到电位计上。由於电位计至少可以读到四位数字准确,所以读数的
The use of high-frequency vibrator device to indicate the endpoint of titration of volumetric analysis has been greatly developed in recent years. This article aims to introduce a less money, stability, sensitivity, simple procedures for the operation of the device for general laboratory applications. The device is essentially based on the crystal oscillator circuit used by Alexander, Bender and Fisher to determine the dielectric constant, followed by Hall’s modification for high-frequency titration. As the author applied a potentiometer instead of a vacuum tube voltmeter, the accuracy and rehearsal, etc. are improved. The device uses the 6E5 tube as part of the transistor tube vibration, electric eye part of the instructions vibration soup situation. Vibrator crystal oscillator, vibrator circuit and tune the screen-tune oscillator, but the gate tuning circuit instead of crystal. The crystal can give a fixed frequency when oscillating. The frequency of the crystal we used was 3.24 M.C. In our design we changed the gate and drain to a fixed resistor and a variable resistor from the variable resistor two leads to the potentiometer. As the potentiometer can read at least four digits accurate, so reading