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Method and bridge for improving inductance measurement precision of Maxwell bridge

A technology of inductance measurement and electric bridge, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of unfavorable use of measuring instruments, high requirements for measuring operators, and affecting the accuracy of inductance measurement, etc., to achieve Improve measurement accuracy, ensure measurement accuracy, and prolong service life

Inactive Publication Date: 2013-01-02
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.

Method used

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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, a Maxwell bridge is commonly used, and its schematic diagram is as follows figure 1 As shown, after the bridge is balanced, the relationship is as follows:

[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 Respectively, the inductance value and the equivalent series resistance value to be tested, 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 presence of the ground leakage capacitance at the 4 terminals of the bridge, the D1 branch of the zero indicator is not a virtual ground potential (that is, zero potential). Therefore, it is necessary to add an auxiliary balancing branch Z 1 ,Z 2 to eliminate the effects of such leaks, Z 1 ,Z 2 The branch is the widely used bridge-assisted...

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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 metering and testing, and relates to the precise measurement of inductance parameters, a basic quantity of electrical AC impedance, in particular to a method for improving the inductance measurement accuracy of a Maxwell bridge and an electric bridge. Background technique [0002] Inductance is a physical quantity to measure the ability of a coil to generate electromagnetic induction, and the inductance parameter is an important parameter in AC impedance measurement. Inductance coils of different sizes and scales are widely used in industries such as electric power, transportation, smelting, electronics, IT, and communications. Their quality depends on the inductance value and Q value at different frequencies. Therefore, it is of great significance to ensure accurate measurement of the inductance value. [0003] To measure inductance, an equivalent inductance bridge composed of Maxwell bridge, Owen bridge and CR (c...

Claims

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Application Information

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Patent Type & Authority Patents(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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