METHOD OF MEASURING PHASE SHIFT OF LOW FREQUENCY FILTER SYNCHRONOUS DETECTOR Russian patent published in 2016 - IPC G01R25/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment, particularly, to methods of measuring a phase shift of a low frequency filter of a sync detector. Essence of the invention consists in double measurement of output signal voltage U₁, U₂ of the detector obtaining initial value U₁ at frequency difference module ω_pr of reference and information signals transmitted to its inputs, equal to frequency, on which it is necessary to determine a phase shift, and then at a change of one of the input frequency to the frequency corresponding to maximum value U₂ detector output signal; then it is necessary to register the modulus of difference ω_p of frequencies fed to the inputs, and to calculate phase shift φ in accordance with expression Non-uniformity of Δ amplitude-frequency characteristic of the detector signals is determined in accordance with expression

EFFECT: technical result consists in improvement of accuracy of phase shift measurement.

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