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A four-terminal pair AC quantum resistance transfer bridge and method

A technology of AC resistance and four-terminal pair, which is applied in the direction of AC/DC measuring bridge, measuring electric variable, measuring device, etc., can solve the problems such as complex structure and switching of AC impedance bridge, difficult to realize, etc., to reduce mutual interference effect

Active Publication Date: 2021-12-24
BEIJING DONGFANG MEASUREMENT & TEST INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The imaginary part compensation voltage is usually obtained by dividing the voltage of a component voltage capacitor and the output resistor. When the frequency changes, the impedance value 1 / jωc generated by the capacitor will change. Therefore, to achieve multiple frequency points, multiple components are required. The piezoelectric capacitor makes the structure and switching of the four-terminal pair AC impedance bridge very complicated and difficult to realize

Method used

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  • A four-terminal pair AC quantum resistance transfer bridge and method
  • A four-terminal pair AC quantum resistance transfer bridge and method
  • A four-terminal pair AC quantum resistance transfer bridge and method

Examples

Experimental program
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Embodiment 1

[0043] Such as image 3 As shown, a circuit diagram of a four-terminal pair AC quantum resistance transfer bridge, including an isolated induction voltage divider IVD1, a differential compensation network A4, a ratio induction voltage divider IVD2, a Wagner branch A5, and the first four-terminal pair AC resistance connection point Z1, second four-terminal pair AC resistance connection point Z2, choke coil H and zero indicator D. A standard four-terminal pair AC resistance Rs is connected to the first four-terminal pair AC resistance connection point Z1, and the standard four-terminal pair AC resistance Rs is preferably a four-terminal pair Hall quantum resistance, which can also be calibrated and can reach 10 -8 or other standard resistors with a higher uncertainty level. The second four-terminal pair AC resistance connection point Z2 is connected to the four-terminal pair AC resistance Rx to be tested.

[0044] It is known that the nominal resistance ratio of the standard f...

Embodiment 2

[0050] A method for measuring four-terminal pair AC resistance, using the above-mentioned four-terminal pair AC quantum resistance transfer bridge to measure the four-terminal pair AC resistance Rx to be measured, comprising the following steps:

[0051] Step 1. Estimate or obtain the nominal value of the four-terminal pair AC resistance Rx to be measured as 100Ω. According to the measurement requirements, select the standard four-terminal pair AC resistance Rs as the Hall quantum resistance, preferably 1KΩ, and its uncertainty level is 10 -8 Ω. Connect the second four-terminal pair AC resistance connection point Z2 of the four-terminal pair AC resistance Rx to be tested, and the standard four-terminal pair AC resistance Rs to the first four-terminal pair AC resistance connection point Z1; according to the four-terminal pair AC resistance Rx and The ratio of the standard four-terminal to the nominal value of the AC resistance Rs, the winding of the main proportional induction ...

Embodiment 3

[0061] The internal structure of the differential compensation network A4 is as Figure 5 As shown, it includes the first inductive voltage divider T1, the second inductive voltage divider T2, a set of voltage dividing resistors R (R1-R5) connected to the secondary winding L2 of the first inductive voltage divider T1, and the second A set of voltage dividing capacitor C (C1-C5), resistor R6 and compensation winding B4 connected to the secondary winding L4 of the inductive voltage divider T2, the secondary winding L2 of the first inductive voltage divider T1 and the second inductive divider The secondary winding L4 of the transformer T2 has 10 taps, and each tap has 5 connection points for the corresponding voltage-dividing resistors R (R1-R5) or voltage-dividing capacitors C (C1-C5) respectively. connect. The voltage dividing resistor R (R1-R5) and the voltage dividing capacitor C (C1-C5) respectively choose to connect or not connect the corresponding taps, which can change t...

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Abstract

A four-terminal pair AC quantum resistance transfer bridge and method, comprising a power supply S, a Kelvin branch A1, a Wagner branch A0, a first source combined network A2, a second source combined network A3, a differential compensation network A4, a main Proportional induction voltage divider IVD2, first four-terminal pair AC resistance connection point Z1, second four-terminal pair AC resistance connection point Z2, choke coil H and several zero indicators D, along the winding of the main proportional induction voltage divider IVD2 An isolated induction winding L0 with a low number of turns is wound on the outer circumference, and L0 provides excitation current for the primary winding of the differential compensation network A4, avoiding the mutual influence of each balance finger and zero network caused by the direct connection of the primary winding of A4 to the power supply S, and realizing the bridge Quick balance. And by changing the turn ratio of the second induction voltage divider T2 of the differential compensation network A4, the primary winding L3 and the secondary winding L4, only one set of voltage dividing capacitors can realize the differential compensation of the imaginary part of the multi-frequency point, to achieve The imaginary part is balanced to realize the multi-frequency four-terminal pair AC quantum resistance transfer bridge.

Description

technical field [0001] The invention relates to the technical field of AC resistance transfer, in particular to a four-terminal pair AC quantum resistance transfer bridge and a method thereof. Background technique [0002] Resistance has frequency characteristics, and the traceability of AC resistance is an international problem. Based on the AC quantized Hall effect, basic physical constants are used to define the value of the impedance unit, which has the characteristics of not changing with time and space. It can realize the unification of the unit definition of AC resistance, capacitance, inductance and DC resistance, and can solve the current problem. The problem of traceability of AC resistance is an international cutting-edge measurement technology. The key technical link is to transfer the AC resistance value reproduced by the AC quantized Hall effect to the physical AC standard resistance with a very small uncertainty, so it is necessary to develop 10 -8 The magni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R17/10
CPCG01R17/105G05F1/46G01R35/007H01C1/16H01F27/42H03H11/28H03K17/92
Inventor 黄晓钉佟亚珍蔡建臻潘攀孙毅王书强王乾娟李晶晶侯旭玮
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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