| 摘要 |
<p>The device comprises a current generator (3, 6) which can be controlled by a potentiometer (2). A resistor (11) is connected in series with a pair of removable electrodes (10a, 10b) in a reverse feedback circuit of the generator by way of a transistor (8). The resistor (11) is integral with the electrodes and determines the intensity of the current in the latter. Its value is determined by the surface of the electrodes in order to maintain the current density constant. A light-emitting diode (14) connected to a circuit (13) gives an indication of the current density in the electrodes. A light-emitting diode (19) connected to a comparator (16, 17, 18) signals a saturation of the transistor (8) limiting the current when the resistance between the electrodes exceeds a critical value. A comparator (21) controlling a light-emitting diode (22) for safety signalling and a second transistor (24) make it possible to interrupt the current in the electrodes if, on account of a high level of resistance between the latter, the voltage on the resistor (11) falls below the input voltage of the generator. <IMAGE></p> |
