NULL DETECTOR Russian patent published in 2021 - IPC G05B1/01 

FIELD: measuring.

SUBSTANCE: invention relates to the field of automation, robotic and measuring technology, and is intended for detection of the moment of transition (from negative to positive half-wave) of the input bipolar harmonic signal voltage over the zero level, can be used in apparatuses for measuring time intervals, in particular. The null detector is comprised of a first and second operational amplifiers, a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth and thirteenth resistors, a capacitor, a current limiter unit, an output signal regulator, a diode, and a Schmitt trigger.

EFFECT: increased reliability, accuracy of detection of the zero input signal level and output signal quality and interference immunity.

1 cl, 4 dwg