THERMAL AIR FLOWMETER

摘要

A thermal air flowmeter in which a heat generating resistive element having temperature dependence is arranged in an air flow passage to measure the air flow rate on the basis of an output V2 of a gauge circuit having this element. The flowmeter is also provided with an operation circuit for correcting the output characteristic by using a polynomial the second order or a higher order than the second order. By providing such an operation circuit, higher precision of the thermal air flowmeter can be achieved by a method in place of laser trimming, with a small-scale circuit configuration.