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

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...

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

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