Abstract: A new method for pricision measurement of the phase-angle of pulse modulated sinusoidal signals has been devised. On the basis of this, a new type of phase-angle meter was thus made. Theoretically, when the difference of two measured signals ũ₁ and ũ₂ reaches a minimum, a simple relation exist between the phase difference (φ₁一φ₂) and the amplitude of the minimum differenee (U_dmin), i.e. φ₁一φ₂=sin^-1 (U_dmin/U₁). The method affords a higher accuracy (△φ < <土0.2) and a higher resolving power (△φ' < 0.06°) when φ₁一φ₂ ≤ 5°.
This meter may be used for measuring the amplitude ratio of two signals at the time while the phase difference was measured. When φ₁一φ₂' ≤ 5°, an error of △δ< <士0.2dB and a resolving power of △δ' < 0.12dB were found respectively.