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Generally used pointer or digital resistance tester measurement, special circumstances, vacuum tube voltmeter, high frequency millivolt meter static voltmeter and so on. Take the troubleshooting TV as an example. The voltage measurement must first determine the maintenance process, the nature of the voltage to be measured (AC, DC), and size through fault analysis, and then select the corresponding gear and range of the multimeter. Find the corresponding detection point on the circuit and compare the measurement result with the normal value. If the voltage is found to be abnormal, there may be a fault in the area.
Circuit resistance tester test works The instrument uses a pulse width modulation type high-frequency switching power supply to provide a DC test current greater than 100A, when the measurement key is pressed, the high frequency switching power supply output test current greater than 100A, and the sampling circuit starts The sampled signal is amplified by an amplifier. After the analog signal is converted into a digital signal by an A/D converter, the data is filtered, calculated, and processed by the microprocessor. Finally, the current and resistance of the current measurement are displayed on the monitor. . After 5 seconds is displayed, the system automatically resets.
Loop resistance tester test works
Measurement is a meticulous task. Careful, careful, and truthful judgment is required in the measurement, so that one can do more with less and establish safety awareness. For every operation, we must be able to predict the possible outcomes and how to deal with them. In particular, we must ensure the safety of people and equipment when measuring live. Repair the switching power supply to use an isolation transformer; when connecting a dummy load, ensure that the loop tester does not disconnect the regulated feedback loop. Otherwise, the power supply voltage may rise and the fault may be enlarged. Again if it is not possible to measure the collector output of the line, it must be discharged before removing the kinescope cap.