SHAFT ROTATION FREQUENCY METER Russian patent published in 1997 - IPC

FIELD: digital instruments for automatic measuring equipment. SUBSTANCE: device has detector which has digital output, memory registers, reverse counter, counter, setting register, digital comparators, RS flip-flop, electronic gate, stable pulse generator, pulse divider, delay line, AND gates, OR gate, START line, monitored parameter line. EFFECT: possibility to detect fault detector during device operations, issue failure signal and command for switching fault detector off and switching on respective operating detector. 2 dwg