How to Measure Resistance Accurately with a Multimeter
The ohms range of a multimeter can measure the resistance of conductors. The ohms range is denoted by "Ω" and is divided into four settings: R×1, R×10, R×100, and R×1K. Some multimeters also have an R×10k setting. When using the ohms range of a multimeter to measure resistance, in addition to the requirements mentioned earlier before use, the following steps should also be followed.
1. Set the selection switch to the R×100 position, and short-circuit the two probes to adjust the zero adjustment knob in the ohms range, so that the pointer points to the zero position at the right end of the resistance scale. If the pointer cannot be adjusted to zero, it indicates that the battery voltage inside the meter is insufficient and the battery should be replaced.
2. Use two pen-like tools to touch the two pins of the resistance being measured for measurement. Correctly read the resistance value indicated by the pointer, and then multiply it by the multiplying factor (R×100 should be multiplied by 100, R×1k should be multiplied by 1000, and so on). This is the resistance value of the resistance being measured.
3. To ensure more accurate measurements, the pointer should be positioned near the center of the scale mark during measurement. If the pointer deflection angle is small, switch to the R×1k range; if the pointer deflection angle is large, switch to the R×1O range or R×1 range. After each range change, adjust the zero adjustment knob of the ohms range again before measuring.
4. After the measurement is completed, unplug the probe and set the selection switch to "OFF" or the maximum AC voltage position. Store the multimeter properly.
When measuring resistance, it should be noted that: 1. The resistor being measured should be disconnected from the circuit before measurement.
2. Do not let the two pen-like tools touch each other for an extended period of time.
3. Both hands should not touch the metal shafts 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 simultaneously (as shown in Figure 3-8).
4. If the ohms range is not used for a long time, the battery in the meter should be removed.
