Method and bridge for improving inductance measurement precision of Maxwell bridge

An inductance measurement and bridge technology, which is applied in the measurement of electrical variables, resistance/reactance/impedance, measurement devices, etc. The effect of improving measurement accuracy, ensuring measurement accuracy and prolonging service life

Inactive Publication Date: 2011-08-24
NAT INST OF METROLOGY CHINA
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Problems solved by technology

This balancing process is complicated, time-consuming, and has high requirements for measurement operators. It is easy to cause bridge balance errors, affect the accuracy of inductance measurement, and is not conducive to the popularization and use of such measuring instruments.

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  • Method and bridge for improving inductance measurement precision of Maxwell bridge
  • Method and bridge for improving inductance measurement precision of Maxwell bridge
  • Method and bridge for improving inductance measurement precision of Maxwell bridge

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Embodiment Construction

[0039]Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0040] In inductance measurement, the Maxwell bridge is commonly used, and its schematic diagram is as follows figure 1 As shown, after the bridge is balanced, there is the following relationship:

[0041] L x =R 2 R 4 C (1)

[0042] R x =R 2 R 4 G (2)

[0043] figure 1 Medium, L x , R x are the inductance value to be measured and the equivalent series resistance value, respectively, R 2 , R 4 , C are the standard resistance and capacitance, respectively, and G is the conductance. figure 1 In the Maxwell bridge in , due to the existence of the leakage capacitance of the four terminals of the bridge to the ground, the D1 branch of the zero meter is not a virtual ground potential (ie, zero potential). Therefore, it is necessary to add auxiliary balance branch Z 1 ,Z 2 to eliminate the effects of such leaks, Z 1 ,Z 2 The branch is the widely used bridge-...

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Abstract

The invention provides a method and a bridge for improving inductance measurement precision of a Maxwell bridge, and belongs to the field of measurement testing. According to the method, an inductive voltage divider is combined with a fixed standard capacitor and a standard resistor, and a method for adjusting the output voltage of the inductive voltage divider is used for adjusting the equivalent capacitance and resistance. Simultaneously, the invention has a function of automatic auxiliary balance; the precision measurement for inductance value can be realized by simply completing the balance of the bridge; and the convergence rate of the bridge is greatly improved. Aiming at a shock absorption branch which is required to be introduced for the adding of the automatic auxiliary balance amplifier, the invention provides a compensation circuit for compensating the error caused by the shock absorption branch. In order to overcome the influence of the output impedance of the inductive voltage divider, the invention provides a double-pole high-precision voltage follower with a buffer output stage. By the invention, the speed for measuring inductance is increased, the measurement precision is improved, the service life of the bridge is prolonged, and the reliability of the bridge is improved.

Description

technical field [0001] The invention belongs to the field of measurement and testing, relates to the precise measurement of inductance parameters, the basic quantity of electrical alternating current impedance, and in particular relates to a method and an electric bridge for improving the inductance measurement accuracy of a Maxwell bridge. Background technique [0002] Inductance is a physical quantity that measures the ability of a coil to generate electromagnetic induction, and the inductance parameter is an important parameter in AC impedance measurement. Electric power, transportation, smelting, electronics, IT, communications and other industries widely use inductive coils of different sizes and scales, and their quality depends on the inductance value and Q value at different frequencies, so it is of great significance to ensure the accurate measurement of inductance value. [0003] Measuring inductance usually adopts the equivalent inductive bridge composed of Maxwel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R17/06
Inventor 杨雁陆文骏丁诚黄璐王维
Owner NAT INST OF METROLOGY CHINA
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