| 摘要 |
PURPOSE:To enable to perform an accurate measurement and to widen a measuring range, by a method wherein a change in high frequency resistance between an electrode, connected in series to a bobbin, and an opposite electrode is detected as a change in voltage. CONSTITUTION:A capacitor C and a coil L are inserted in series at a circuit of a high-frequency power source 1, the coil L is wound in an insulating manner around a conductive bobbin 2, and a sensor is connected to the coil L through a lead wire 5. An opposite electrode 7 is coupled to a weighing hopper 8 through an earth wire 6 from a power source 1. The sensor S is inserted into aggregate 4, and a voltage equivalent to a voltage V is fetched between terminals 9 and 9' positioned in parallel to the coil L, and the voltage is directly displayed as a value of a percent in a display unit 12 through an A/D converter 11. |
