Add inductive short circuit tester to multimeter ----- Coil Tester

The commonly used 555 integrated circuit is connected to the unstabilized circuit, which is installed in the space within the multimeter, which is used to determine whether the inductance (such as the high-voltage package of the TV) is short, which is very convenient. The principle of the tester circuit is shown in the figure. To save space, try to use small or miniature components. On the appropriate position of the case, two holes are opened, and the double knife double throw switch K and the potentiometer W are mounted. The multimeter itself circuit does not make any changes. The author weldes the entire circuit on a 1.5 × 3 cm insulating plate. Installed on one side of the MF-47 Matter's head head and fixed with hot melt adhesive, there is more than enough space in the table. How to use: Usually, the switch K is placed in the "normal" position. This circuit does not work, and there is no impact on the normal use of thousands of tables. When you need to measure the inductance. The use of the meter of the AC10V gear, and k is dial to the "measure L" position. At this time, the adjustment potentiometer W is adjusted to have a voltage indication of the maximum 4 to 5V, which can be called "no-load voltage". Connect the table brush to both ends of the inductor to be measured, the potentiometer is adjusted to make the displayed voltage value. Due to the inductance, this most value may be greater than that may be less than the no-load voltage. It is measured to measure a 25-inch color TV, the maximum value of the resonance is up to 40V, and it can be slightly transferred to the measurement process 10V. It is measured to measure a 17-inch black automatic high-pressure bag primary, and the maximum voltage is always below the no-load voltage. When the test is tested, the magnetic core of the inductor is used by a wire. When the wire is shorted, the display voltage should be significantly declined. If the decrease is small or even less decline, it can judge the inside of the measured inductance. There is a short circuit. Author: Huang Ronggen

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