Orthogonal reference phase verification method and device

Abstract

The invention discloses an orthogonal reference phase verification method and device, and the specific verification method comprises the steps: 1, enabling a standard phase source to output orthogonal vector voltages U1 and U2 (nominal: 90 degrees or 270 degrees); 2, employing a phase sampling measurement system to measure the above orthogonal vector voltages U1 and U2: enabling a voltage channel 1 of the phase sampling measurement system to measure the vector voltage U1 and enabling a voltage channel 2 of the phase sampling measurement system to measure the voltage U2, wherein the phase difference between the vector voltages U1 and U2 measured by the phase sampling measurement system is shown in the description; 3, interchanging the voltage channels of the phase sampling measurement system, changing the measurement direction of the vector voltage U1, wherein the phase difference between U2 and U1 measured by the phase sampling measurement system is shown in the description; 4, calculating a quadrature phase error, setting a quadrature phase measurement error of the phase sampling measurement system as delta, setting the nominal orthogonal output phase error (shown in the description) of the standard phase source, and building two linear equations in two unknowns according to the above two phase errors (shown in the description), thereby calculating the quadrature phase error value delta and the nominal orthogonal output phase error (shown in the description).

Description

technical field [0001] The present invention relates to a measurement method and device, in particular to a verification method and device for a quadrature reference phase. Background technique [0002] In the fields of AC measurement such as AC impedance and AC power, the most critical thing is to obtain two orthogonal reference standards. In the early stage, transformers with high Q value (or known Q), capacitors with low loss factor (or known low loss factor), AC resistors with low time constant (or known time constant), etc., or between them Some combination that produces a known analog reference phase angle standard. With the development of digital measurement technology, in many digital measurement instruments, digital phase shifting technology is used to generate quadrature reference signals. In the process of DFT-based AC power measurement, in order to obtain Fourier coefficients, two quadrature digital reference signals are used: sinkωt and coskωt, which have more...

AI Technical Summary

Problems solved by technology

[0011] Since the parameters such as capacitance loss, resistance time constant, parasitic inductance, and parasitic conductance are the parasitic parameters of standard capacitors and resistors, they play a decisive role in the phase shift of the phase shifter. The actual phase shift of the RC phase shifter cannot be accurately measured

The uncertainty of the calculated theoretical phase shift angle of the phase shifter is very large, so this method can only be verified on the millisecond scale

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