Process for measuring a magnitude corresponding to the duty cycle of a periodic square-wave electrical signal and process for measuring the phase angle between two periodic square-wave electrical signals in quadrature and devices for carrying out said processes

摘要

In a method for determining the phase angle between periodic electric rectangular signals (S _v, S _R), the means of an Exclusive-OR gate (G ₃ ') linked rectangular signal (S') to an input E ₁ 'a digital selection circuit (L') supplied digitizes the output square wave signal (S ') after passing through a low-pass filter (F') as a time integral arithmetic mean (S ₂ ') by means of a converter (U') and is supplied as a numerical value (M ') a digital computer (R'). The digital computer (R ') applied to further inputs (E _2', E ₃ ') of the digital selection circuit (L') with digital control signals (P, ', P _2') and produces the calculation of the phase angle by combinations of the digital control signals (P , ', P _2') at the output (a ') of the digital selection circuit (L'), the rectangular signal (S '), an upper signal level (SO') and a lower signal level (SU ₁ ') of the rectangular signal (S, '). The upper signal level (SO ') and the lower signal level (SU,') are digitized after passing through the low-pass filter (F ') by means of the converter (U') and as a numerical value (E ') for the upper signal level (SO') and as a numerical value (N ') for the lower signal level (SU,') fed to the rectangular signal (S ') the digital computer (R').