PROBLEM TO BE SOLVED: To provide a measuring circuit for resistance, capable of easily acquiring the resistance value of an electric circuit in noncontact.SOLUTION: A measuring circuit for resistance for acquiring electric characteristics to calculate a value of measured resistance RL includes a first coil and a first capacitor connected in parallel to the measured resistance and caused to resonate in parallel at a predetermined frequency f, a second coil electromagnetically coupled with the first coil, and a detection circuit for detecting electric characteristics containing an inductance component L20 and a resistance component R20 at the frequency f of only the second coil in a state where the first coil and the second coil are not electromagnetically coupled, and detecting electric characteristics containing an inductance component L2a and a resistance component R2a at the frequency f in a state where the second coil and the first coil are electromagnetically coupled.COPYRIGHT: (C)2012,JPO&INPIT【課題】電気回路の抵抗値を非接触で簡単に得ることができる抵抗用測定回路を提供する。【解決手段】 被測定抵抗RLの値を求めるための電気特性を得る抵抗用測定回路は、被測定抵抗に並列接続され,所定の周波数fで並列共振する第1コイル及び第1コンデンサと、第1コイルと電磁結合される第2コイルと、第1コイルと第2コイルとが電磁結合されていない状態で第2コイルのみの周波数fでのインダクタンス成分L20及び抵抗成分R20とからなる電気特性を検出し,第2コイルが前記第1コイルと電磁結合した状態で前記周波数fでの第2コイルのインダクタンス成分L2a及び抵抗成分R2aとからなる電気特性を検出する検出回路と、を備える。【選択図】 図1
