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Digital simulation impedance normalization device

A digital analog and standard technology, applied in the measurement of resistance/reactance/impedance, instruments, measuring devices, etc., can solve the problems of inability to automatic control, narrow frequency range, large size, etc.

Inactive Publication Date: 2005-12-21
中国航天科技集团公司第五研究院第五一四研究所
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  • Abstract
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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

Method used

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Embodiment Construction

[0036] Such as figure 1 , 2 As shown, the present invention controls the whole system by the single-chip microcomputer as the CPU processor, the single-chip microcomputer is connected with the host computer through the RS232 interface, utilizes the LABVIEW platform to compile the operation program on the host computer, according to the impedance value to be simulated, the output related parameters calculated, such as Voltage digital amplitude and V-V ratio value, current digital amplitude and V-I shunt value, starting phase point and extraction interval of voltage waveform, initial phase point and extraction interval of current waveform, number of points inserted per cycle, measurement frequency, etc., Among them, the amplitude ratio and phase difference data are corrected and calculated. These data are transmitted to the single-chip processor through a simple custom protocol, and the single-chip computer sets the frequency division number of the frequency tracking unit, the ...

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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...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 刘民
Owner 中国航天科技集团公司第五研究院第五一四研究所
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