| 摘要 |
A device for measuring body fat is provided to improve speed of measuring impedance by calculating a potential difference of a specific part without switching operation with a high input impedance operational amplifier. A device for measuring body fat includes eight electrodes(E1~E8), a current supply device(11), and a current supply switch(21). The eight electrodes are contacted to left and right hands and feet respectively. The current supply device flows predetermined current between the two electrodes among the eight electrodes. The current supply switch, controlled by a microprocessor(110), selects the electrodes and the current supply device. The device for measuring body fat further includes a voltage measuring unit(100). The voltage measuring unit has a first operational amplifier(101) connected to the electrode between the right and left hands, a second operational amplifier(102) connected to the electrode between the right hand and foot, a third operational amplifier(103) connected to the electrode between the right and left feet, and a fourth operational amplifier(104) connected to the electrode between the left hand and foot, and measures voltage through outputs of the operational amplifiers.
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