PROBLEM TO BE SOLVED: To provide an AC constant current source and bioelectric impedance measurement device capable of lowering the voltage of a power source by suppressing the voltage amplitude of the AC constant current source when supplying a current to an electrically floating measurement object.SOLUTION: The AC constant current source includes an AC constant voltage source 11, an arithmetic amplifier 12, and a partial pressure circuit 13. The output of the AC constant voltage source 11 is connected to a current supply electrode E1. The inverting input of the arithmetic amplifier 12 is connected to the current supply electrode E1, and the output of the arithmetic amplifier is connected to a current supply electrode E2. The partial pressure circuit 13 outputs a voltage that is obtained by dividing an output voltage V10 from the AC constant voltage source 11 to the non-inverting input of the arithmetic amplifier 12.COPYRIGHT: (C)2013,JPO&INPIT【課題】電気的に浮遊した測定対象物に電流を供給する際の交流定電流源の電圧振幅を抑制し、電源の低電圧化が可能な交流定電流源及び生体電気インピーダンス測定装置を提供すること。【解決手段】本発明の一態様である交流定電流源は、交流定電圧源11、演算増幅器12及び分圧回路13を有する。交流定電圧源11は、出力が電流供給用電極E1と接続される。演算増幅器12は、反転入力が電流供給用電極E1と接続され、出力が電流供給用電極E2と接続される。分圧回路13は、交流定電圧源11からの出力電圧V10を分圧した電圧を、演算増幅器12の非反転入力に出力する。【選択図】図1
