| 摘要 |
PURPOSE: To compensate parasitic resistance by measuring discharged electric current by applying standard voltage lower than the nominal voltage to an electrochemical cell and providing compensated standard voltage corresponding to the discharged electric current. CONSTITUTION: At the time of a pause in measurement, the control signal Ve is higher voltage than the nominal voltage Vb of a storage battery 10 and is inputted to a computation amplifier 11 through a compensation circuit 50, At that time, the output of the computation amplifier 11 is zero or negative, and a switching transistor 13 is turned off and no electric current flows in the battery 10. When the Ve is controlled to be a standard voltage Vd lower than the prescribed voltage Vb for measurement, discharge electric current Io of the battery 10 flows, and the electric current value Io is measured by a voltage-processing apparatus 15 and the charged state is displayed on an indicator 16. Feedback of the voltage applied to a shunt resistor 14 is carried out to the computation amplifier 51 via a compensation resistor Rc, and the compensated standard voltage Vs which compensates the parasitic resistance of the battery 10 is outputted out of the circuit 50.
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