| 摘要 |
PROBLEM TO BE SOLVED: To ensure highly precise measurement by constituting the terminal board and the noise filter part shielded for inhibiting the electric noise from external superimposing on the output of the ultrasound sensor because of weak output of the ultrasound sensor, the output of which are voltage of 10<SP>-3</SP>V and current of 20×10<SP>-6</SP>A. SOLUTION: The ultrasound flowmeter is constituted of a terminal board 58, and a noise filter part 57, both of which are shielded. Moreover, it is constituted so that the radiated noise hardly superimpose on lead wires 65 of ultrasound sensors 52, 53 and lines on a printed board 55, because of the superimposed noise on the lead wires and the lines affect to the measurement. COPYRIGHT: (C)2008,JPO&INPIT
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