INSTRUMENT FOR MEASURING VOLTAGE OF BATTERY

摘要

PROBLEM TO BE SOLVED: To reduce the cost of an instrument for measuring voltage of a battery by eliminating the need for providing gain-correcting amplifiers to differential amplifiers which respectively measure the voltages of batteries, and at the same time, to reduce dark current and its fluctuation. SOLUTION: Differential amplifiers 2 which obtain output voltages corresponding to the voltages of batteries 1 are provided on each battery 1 and the amplifiers 2 are divided into groups 5 of an appropriate number. Then ground terminals 6 (6-1 to 6-n) which are insulated from each other are provided at each group 5 (5-1 to 5-n), and at the same time, control power sources 7 (7-1 to 7-n) which are insulated form each other are provided in each group 5. Then the power sources 7 (7-1 to 7-n) are respectively connected between power terminals 2a of the differential amplifiers 2 and the ground terminals 6 (6-1 to 6-n).