Measurement of resistance of digital multimeter
Insert the red probe into the "V/Ω" socket and select the appropriate resistance measurement range according to the size of the resistance. The red and black probes should contact both ends of the resistance and observe the reading. Especially, when measuring in circuit resistance (resistance on the circuit board), the power supply of the circuit should be turned off first to avoid causing reading jitter. It is prohibited to measure current or voltage (especially AC 220V voltage) using a resistance range, otherwise it may damage the multimeter. In addition, using the resistance range can also qualitatively determine the quality of the capacitor. First, short circuit the two terminals of the capacitor (use one probe to simultaneously contact both terminals to discharge the capacitor), then touch the two probes of the multimeter separately to the two terminals of the capacitor and observe the displayed resistance reading. If the resistance reading displayed at the beginning is very small (equivalent to a short circuit), and then the capacitor begins to charge, the displayed resistance reading gradually increases, and then the displayed resistance reading becomes "1" (equivalent to an open circuit), it indicates that the capacitor is good. If the displayed resistance reading remains unchanged after following the above steps, it indicates that the capacitor is damaged (open or short). Special attention should be paid to selecting the appropriate resistance range based on the size of the capacitance during measurement, such as using the 200k range for 47 μ F and the 2M range for 4.7 μ F, etc.
Measurement of resistance of digital multimeter
Insert the red probe into the "V/Ω" socket and select the appropriate resistance measurement range according to the size of the resistance. The red and black probes should contact both ends of the resistance and observe the reading. Especially, when measuring in circuit resistance (resistance on the circuit board), the power supply of the circuit should be turned off first to avoid causing reading jitter. It is prohibited to measure current or voltage (especially AC 220V voltage) using a resistance range, otherwise it may damage the multimeter. In addition, using the resistance range can also qualitatively determine the quality of the capacitor. First, short circuit the two terminals of the capacitor (use one probe to simultaneously contact both terminals to discharge the capacitor), then touch the two probes of the multimeter separately to the two terminals of the capacitor and observe the displayed resistance reading. If the resistance reading displayed at the beginning is very small (equivalent to a short circuit), and then the capacitor begins to charge, the displayed resistance reading gradually increases, and then the displayed resistance reading becomes "1" (equivalent to an open circuit), it indicates that the capacitor is good. If the displayed resistance reading remains unchanged after following the above steps, it indicates that the capacitor is damaged (open or short). Special attention should be paid to selecting the appropriate resistance range based on the size of the capacitance during measurement, such as using the 200k range for 47 μ F and the 2M range for 4.7 μ F, etc.
