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本文介绍一种巧妙的自动平衡接地方法的理论,实际装置和试验结果。这种方法使得精密电桥工作容易,并避免了用一般接地装置而引起的繁复平衡手续,从而节约了所需要的时间和劳动。这种原理的有效性可用马克斯威尔——文氏(Maxwell-Wien)电桥来说明,在电桥中采用一个专用的、十分小而简单的放大器于反馈电路中。在指示器的端头上附接0.1微法的电容,在电感从1亨到1毫亨的测量范围内,对电成和1/Q 的测量引起100×10~(-6)数量级的误差。把这种原理应用到实际的电桥上,误差为10×10~(-6)数量级或更低些。本文对反馈系统的稳定性和为这种应用的实际放大器作了某些考虑。
This article presents a clever theory of automatic balanced grounding method, the actual device and test results. This method makes it easy to work with a precision bridge and eliminates the need for complicated balancing procedures with a common grounding device, saving the time and effort required. The validity of this principle can be demonstrated using the Maxwell-Wien bridge, where a dedicated, very small, simple amplifier is used in the feedback circuit. A 0.1 μF capacitor is attached to the tip of the indicator and induces an error of the order of 100 × 10 -6 in the measurement of electroporation and 1 / Q in the measurement range of inductance from 1 to 1 millihenry . This principle is applied to the actual bridge with an error of the order of 10 × 10 -6 or less. This article gives some considerations for the stability of the feedback system and for the actual amplifier used for this application.