TESTING A BATTERY CONNECTED TO OPERATING EQUIPMENT

摘要

A method and apparatus for testing a string of batteries (24) connected to a power supply (18) for operating electrical equipment (10). The equipment inherently provides a source of broad-band noise. Current is measured across a conductive link (28) which interconnects adjacent batteries. Voltage across a selected battery is also measured. An impedance analyzer (30) combines the measured current and voltage to determine the impedance over many sampling periods. This data is Fourier transformed to obtain the frequency-dependent complex impedance of the selected battery, which can be related to the selected battery's capacity.