DEVICE FOR REMOTE TESTING OF PIEZOELECTRIC TRANSDUCERS Russian patent published in 1995 - IPC

FIELD: instruments. SUBSTANCE: device has direct voltage power supply 1 and 30, adder 2, oscillator controlled by voltage, symmetric grounded-middle-tap transformer 4, phase shifting circuit 5, capacitor 6, piezoelectric transducer 7, amplifier 8, detector 9, saw-tooth voltage generator 10, two commutators 11 and 16, three dividers 12, 13, 17, rectangular pulse generator 14, capacitors unit 15, electronic switch 18, pulse shaper 19, three comparison units 20, 23 and 34, flip-flop 21, AND gate 22, phase detector 24, digital-to-analog converter 25, two inverters 26, 33, operation indicator 27, comparison circuit 28, reference voltage source 29, circuit failure indicator 31, balance indicator 32, period counter 35, OR gate 36. EFFECT: increased functional capabilities. 3 dwg