| 摘要 |
<p>The tester signals acoustically resistance and continuity. It consists of a d.c. voltage source (1), whose negative terminal (-) is connected to an electronic oscillator(3), and its other terminal(+) to one of two set terminals (5, 6) between which the test circuit is produced. The second terminal (6) is connected to the second terminal of the oscillator (3). A second d.c. voltage source (2) terminal (+) is connected to the oscillator (3) terminal to which the first voltage source (1) is also connected. Its other terminal (-) is connected through a resistor (4) to the terminal (6). The electronic oscillator controls an amplifier (7).</p> |
