Methods for Measuring Resistance with a Multimeter
1. Place the selection switch in high magnification mode, short-circuit the two probes to adjust the zero position knob of the ohm range, so that the pointer points to the zero position on the right end of the resistance scale line. If the pointer cannot be adjusted to zero, it indicates that the battery voltage in the meter is insufficient and the battery should be replaced.
2. Use two probes to respectively touch the two pins of the measured resistor for measurement. Correctly read the value of the resistance pointed by the pointer, and multiply it by the multiplier to obtain the resistance value of the measured resistor.
3. To make the measurement more accurate, the pointer should be placed near the center of the scale line during measurement. If the pointer angle is small, switch to low magnification mode. If the pointer angle is large, switch to high magnification mode. After each gear shift, adjust the Ohm gear zero adjustment knob again before measuring.
4. After the measurement is completed, the probe should be pulled out and the selection switch should be placed in the "OFF" position or the maximum AC voltage position. Put away the multimeter.
When measuring resistance, attention should be paid to:
1. The measured resistance should be removed from the circuit before measurement.
2. Do not touch the two probes together for a long time.
3. Both hands should not touch the metal rods of two probes or the two pins of the measured resistor at the same time. It is best to hold both probes with the right hand at the same time
4. If the ohm range is not used for a long time, the battery in the meter should be removed.
Precautions for measuring resistance with a multimeter
(1) Select the appropriate magnification range to bring the pointer as close as possible to the center of the scale to ensure accurate readings. When measuring, the value indicated by the pointer on the scale multiplied by the multiplier is the resistance value of the measured resistor.
(2) Before measuring resistance or after switching to different magnification settings, the two probes should be short circuited and zeroed using the zero knob. If the zero position cannot be reached, the battery should be replaced. After the measurement is completed, the conversion switch should be turned to the highest AC voltage level or neutral to prevent the probe from short circuiting and causing battery short circuit discharge. At the same time, it also prevents forgetting to shift to measure voltage during the next measurement and burning out the meter head.
(3) It is not allowed to measure resistance with electricity, otherwise not only will the correct reading not be obtained, but the meter head may also be damaged.
(4) When measuring the positive and negative resistance of semiconductor components with a multimeter, use the R * 100 range instead of the high resistance range to avoid damaging the semiconductor components.
(5) It is strictly prohibited to directly measure the internal resistance of instruments such as microamperes, ammeters, and standard batteries using the resistance range of a multimeter.
