| 摘要 |
PURPOSE:To reduce a voltage and a current applied to a circuit to be tested and thereby to obtain a reliable continuity tester by a method wherein the resistance on one side of a bridge circuit is constituted by two resistors and both ends of one resistor of the two are used as input terminals. CONSTITUTION:This device is constituted by a bridge circuit 1 whose one side is composed of two resistors at least, by a differential amplifier 2, by a comparator 3 of the voltages of these elements, and by an indication means 4. Input terminals 12 and 13 whereby a continuity test is conducted are connected to the opposite ends of a resistor 11 of the bridge circuit 1, respectively. When the input terminals 12 and 13 are opened, the potential between the outputs 14 and 15 of the bridge circuit 1 is positive on the side of the output 14. When a resistance of 5OMEGA or below is connected between the input terminals 12 and 13, the potential of the outputs 14 and 15 turns negative on the side of the output 14, the outputs 16 and 17 of the differential amplifier 2 are inverted, the output of the voltage comparator 3 turns ON, and a buzzer 4 sounds. |
