Instrument for measuring voltages of cells

摘要

PCT No. PCT/JP98/04438 Sec. 371 Date May 19, 1999 Sec. 102(e) Date May 19, 1999 PCT Filed Sep. 30, 1998 PCT Pub. No. WO99/17123 PCT Pub. Date Apr. 8, 1999Differential amplifiers (2) are provided to each of the batteries (1) for obtaining output voltages corresponding to the two terminal voltages of each battery (1). These differential amplifiers (2) are divided into groups (5) of a suitable number, and for each group (5), mutually insulated ground terminals (6) and mutually insulated control power sources (7) are provided. Each control power source (7) is connected between the power source terminal (2a) of each differential amplifier (2) and each ground terminal (6) of the respective group (5).