Digital simulation impedance normalization device

Abstract

A digital analog impedance standard consists of CPU , two RAM waveform storages , two D / A chips , V - V proportioning meter , V - I splitter , V - I galvanometer , digital electric bridge , address generator and clock driving . It can remain phase differences of current and voltage waveforms in two circuits unchanged and keep them the same frequency as frequency in input signal, furthermore it can replace material standard for carrying out digital electric bridge calibration automatically.

Description

technical field [0001] The present invention relates to a kind of digital electric bridge (or claiming LCR impedance measuring instrument) measurement and calibration used standard device, especially a kind of digital analog impedance standard device, it can provide the measured value of standard for the digital electric bridge being calibrated, through The comparison between the standard value and the displayed value can determine whether the calibrated digital bridge meets its index requirements, and is suitable for five-port or four-terminal digital bridges with separate input of AC voltage and AC current. Background technique [0002] The current method of measuring and calibrating the digital bridge (or LCR impedance measuring instrument) is to use physical measuring tools characterized by material properties and spatial structures, such as standard capacitors (boxes), standard resistors (boxes), and standard inductors (boxes). , based on the verification procedures for...

AI Technical Summary

Problems solved by technology

[0003] The technical problem of the present invention is to overcome the shortcomings of the existing physical impedance standard that cannot be automatically controlled, and the volume is large, the weight is large, and the frequency range is narrow, and a digital analog impedance standard is provided, which can operate in a large range (capacity 100pF~ 1F, inductance 100uH ~ 1000H, resistance 0.01Ω ~ 1MΩ), and wide frequency (100Hz ~ 1MHz) to produce the same analog value as the standard physical impedance measuring tool (such as standard resistance, standard capacitance, standard inductance), can also be Output the impedance value of any combination of amplitude and phase, and the best point of relative measurement uncertainty can be less than 1.5×10 -4 , the best point of annual stability can be less than 1.5×10 -4

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