AC bridge with automatic auxiliary balancing function and impedance measurement method

A technology of auxiliary balance and AC bridge, which is applied in the direction of AC/DC measuring bridge, measuring resistance/reactance/impedance, and a device for automatically comparing the measured value with the reference value, etc., which can solve the complex measurement process of the bridge and the measurement Low precision and other problems, to achieve accurate and fast AC impedance measurement, improve the effect of convergence speed

Active Publication Date: 2014-01-22
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0020] In order to solve the problem that the bridge measurement process in the prior art is complicated and the measurement accuracy is low, the invention provides an AC bridge with automatic auxiliary balancing function and its impedance measurement method

Method used

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  • AC bridge with automatic auxiliary balancing function and impedance measurement method
  • AC bridge with automatic auxiliary balancing function and impedance measurement method
  • AC bridge with automatic auxiliary balancing function and impedance measurement method

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Embodiment

[0077] An AC bridge with an automatic auxiliary balancing function, comprising an AC power source AC, a main induction voltage divider T1, an auxiliary induction voltage divider T2, a first capacitor to be compared Y1, a second capacitor to be compared Y2, and a zero indicator D1.

[0078] Among them, the AC power supply is 110V. In the AC bridge, the capacitance transmission range is from 1pF to 100pF, and the working frequency is audio frequency. The typical working frequency is 1592Hz. The highest measurement accuracy of the bridge is 10 -8 order of magnitude.

[0079] The voltage division ratio of the main inductive voltage divider T1 and the auxiliary inductive voltage divider T2 is 10:1, and the number of turns is 110 turns.

[0080] In the negative feedback branch:

[0081] The isolation transformer T3 is a 20-turn 1:1 transformer.

[0082] The filter F1 adopts a band-pass filter with automatic center frequency tracking and Q=5, and the band-pass gain is 1.

[0083] ...

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Abstract

The present invention provides an AC bridge with an automatic auxiliary balancing function and an impedance measurement method. The AC bridge comprises the following components: an AC power supply, a main inductive voltage divider, an auxiliary inductive voltage divider and a null indicator. The main inductive voltage divider and the auxiliary inductive voltage divider have a same inductive voltage dividing ratio. A negative feedback branch circuit which is obtained through serially connecting an active voltage follower, an inverting amplifier, a wave filter and an insulating transformer is arranged between the main inductive voltage divider and the auxiliary inductive voltage divider. An original edge of the insulating transformer is connected with the auxiliary inductive voltage divider. The input end of the active voltage follower is connected with the main inductive voltage divider, and the output end is connected with the null divider. According to the measurement method, after the divided voltage on the main inductive voltage divider is processed by the negative feedback branch circuit, the branch circuit of the null indicator automatically acquires ground potential. The bridge can realize impedance comparing measurement through a simple main balance. The AC bridge of the invention realizes accurate and quick AC impedance measurement and greatly improves convergence rate of the AC bridge.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to an AC bridge with an automatic auxiliary balancing function and an impedance measurement method thereof. Background technique [0002] The AC bridge is an important part of electrical measurement technology. The AC bridge is used to measure the parameters of the AC circuit. Since the bridge measurement method is a comparative measurement method, it has higher accuracy than the direct measurement method, so it is currently the most widely used and most exact method. [0003] An AC bridge is a circuit that compares two AC voltages or two AC impedances using differential measurements. It is composed of three parts: bridge body, power supply and zero indicator. [0004] Such as figure 1 As shown, the traditional AC bridge is developed from the structure of a DC four-arm bridge, that is, a single bridge or a Wheatstone bridge. [0005] The bridge body of the four-ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R17/14G01R17/06G01R27/14
Inventor 杨雁陆文骏赵建亭黄璐陆祖良
Owner NAT INST OF METROLOGY CHINA
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