How to measure resistance with a multimeter?
(1) Measure the resistance with a multimeter
The ohm range of the multimeter can measure the resistance of the conductor. The ohm level is represented by "Ω" and is divided into four levels: R×1, R×10, R×100 and R×1K. Some multimeters also have R×10k files. Use the multimeter ohm gear to measure the resistance, in addition to the requirements that should be done before use, you should also follow the following steps.
1. Set the selector switch to the R×100 gear, and short-circuit the two test pens to adjust the zero position adjustment knob of the ohm position, so that the needle points to the zero position on the right end of the resistance scale line. If the pointer cannot be adjusted to zero, it means that the battery voltage in the watch is insufficient, and the battery should be replaced.
2. Use two test pens to respectively touch the two pins of the resistance to be measured for measurement. Correctly read the value of the resistance pointed by the pointer, and then multiply by the magnification (R×100 gear should be multiplied by 100, R×1k gear should be multiplied by 1000…). is the resistance value of the resistor being measured.
3. In order to make the measurement more accurate, the pointer should be near the center of the scale line when measuring. If the declination angle of the pointer is small, the R×1k gear should be used, and if the pointer declination angle is large, the R×1O gear or R×1 gear should be changed. After each gear change, the ohmic zero adjustment knob should be adjusted again, and then measured again.
4. After the measurement, the test leads should be pulled out, and the selector switch should be set to the "OFF" gear or the maximum AC voltage gear. Put away the multimeter.
When measuring resistance, pay attention to:
1. The resistance to be measured should be removed from the circuit and then measured.
2. Do not touch the two test pens together for a long time.
3. Two hands cannot touch the metal rods of the two test leads or the two pins of the resistance under test at the same time. It is better to hold the two test leads with the right hand (as shown in Figure 3-8).
4. If the ohm gear is not used for a long time, the battery should be removed from the watch.
