FLOW RATE MEASURING APPARATUS

摘要

PROBLEM TO BE SOLVED: To rapidly and accurately set a reference voltage so that the arrival time of a reception signal in ultrasonic waves can be detected most stably. SOLUTION: A reference setting means 14 changes a reference voltage to be applied to a reference comparison means 7 from the minimum to the maximum, and sets the supply voltage according to the distribution condition of the inflection point of an output width clocked by an output width clocking means 13 obtained at that time. As a result, even if a voltage change in the reception signal of ultrasonic waves occurs, the reference voltage can be rapidly and accurately set to a position where the arrival timing of the reception signal of the ultrasonic waves can be detected most stably. COPYRIGHT: (C)2004,JPO