| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a dishwasher which achieves improved turbidity measurement accuracy by correcting a turbidity detection value error due to a secular change even if it occurs in an electrode sensor. <P>SOLUTION: A turbidity sensor device includes a colpitts oscillator circuit 1 equipped with the electrode sensor 4, a rectifier circuit 2 for rectifying an oscillation voltage output of the oscillator circuit, and a drive supply voltage adjusting part 7 controlled by a microcomputer 8 and allows a plurality of different supply voltages to be applied to the colpitts oscillator circuit 1. Turbidity measurement accuracy on washing water is improved by making correction for Q in a circuit to be identical through a supply voltage raised by means of a higher supply voltage applied to the colpitts oscillator circuit 1 against an impedance change due to a secular change of the electrode sensor 4 and by making an output change curve almost equivalent during turbidity measurement. <P>COPYRIGHT: (C)2013,JPO&INPIT |
