Notes on measuring resistance with a multimeter
1, pointer multimeter ohm gear resistance measurement should remember to ohm zero, and then change the gear measurement, but also to adjust the zero, digital multimeter, we should pay attention to the pen line resistance, especially when the poor-quality pen line group is very large (generally 0.2 or so)
2, measuring the resistance of wu components on the circuit board, it is recommended to disconnect a foot measurement, so as not to be affected by the circuit, the measurement of accurate data
I use the resistance of the multimeter is mainly in these four aspects: First, the resistance of the lowest gear to measure the line through or off; Second, the resistance of the appropriate gear to measure the motor is good or bad, such as the coil resistance is normal and whether the motor is shorted to ground leakage, etc.; Third, the resistance of the appropriate gear in the circuit board to detect the good and bad components, such as resistors and so on tertiary tubes; Fourth, with the resistance of the pointer multimeter can be tested Some capacitors are probably good or bad. I usually is so with the multimeter resistance block.
Most of the electrical equipment has a standard resistance value, we use the multimeter resistance may assist in determining the normal abnormality of the electrical equipment, of course, is not to use this measurement of the two resistance abnormality is necessarily abnormal, the resistance of the electronic equipment affects a number of factors, such as density, quality, area. Quality, area. Temperature has an impact, for example, you are measuring 20 degrees Celsius when the resistance of 100 ohms, to 40 degrees Celsius when the resistance may become 90 or so, so this is just an auxiliary test!
