Monitor checking charge of primary cell - measures residual HF voltage of applied HF signal without loading cell

摘要

The monitor checks the charge state of a primary cell without loading it. The cell is supplied with an HF signal and the HF voltage remaining across the cell is measured and used to indicate the cell's charge state The HF oscillator (7) is coupled via a capacitor (2) and an adjustable impedance transformer (8, 9) to the cell (3). The measuring instrument (4) can be connected by a switch (12) either via resistor (13) to the cell or to the output of an amplifier (10, 11) whose input is connected via a capacitor (5) to the cell.