CALIBRATION DEVICE FOR ULTRASONIC FLOWMETER Russian patent published in 1997 - IPC

FIELD: calibration of time-pulse ultrasonic flowmeters. SUBSTANCE: calibration device has input 3, 4 and output 1, 2 buses, microprocessor system 5, keyboard 6, display 7, timer 8, programmable interface 9, three digital-to-analog converters 10, 11, 12, commutator 13, discriminator 14, voltage-to-time converter 15 with inverse relationship, three adders 16, 18, 21, source 19 of reference voltage, unit 20 to set initial conditions, voltage-to-current converter 22, four current switches 17, 23, 24, 25, capacitor 26 and comparator 27. EFFECT: increased functional reliability. 3 dwg