MEASUREMENT CHARACTERISTIC REVISION FACTOR CALCULATING SYSTEM OF BREATH FLOW MEASUREMENT DEVICE USING CONSTANT VOLTAGE DIFFERENCE AND MEASUREMENT CHARACTERISTIC REVISION FACTOR CALCULATING METHOD

摘要

PURPOSE: A system is provided to easily measure a measurement characteristic revision factor which enables more exact measurement. CONSTITUTION: A syringe(10) is connected to a breath tube of a breath flow measuring device(50). A detection part(20) senses a volume variation in the syringe to output a voltage signal. An analog-to-digital converter(30) converts a volume variation signal and a differential voltage signal into digital signals. The volume variation signal is detected by a voltage signal from the detection part(20). The differential voltage signal is detected through a signal extracting circuit(56) from a differential voltage sensor(54) connected to a breath flow sensor(52) connected to the device(50). A computer(40) calculates a measurement characteristic revision factor using output signals of the converter(30).