The process of measuring resistance with an analog multimeter:
① Select the gear (×1, ×10, ×100, ×1K, etc.), then short‑circuit the two test probes. Adjust the zero‑adjustment resistor (rotatable potentiometer) to make the pointer point to the 0‑ohm scale. (This step is called "resistance zero‑adjustment".)
② Connect the two test probes to both ends of the resistor under test (note that the resistor shall not be connected to any other circuit). The resistance value equals the scale reading multiplied by the multiplier. Example: When using the ×100 gear and the pointer points to 20, the result is 20 × 100 = 2000 Ω.
Note: The measurement result is more accurate when the pointer is near the middle of the scale. If the pointer is too close to either end of the scale, change the gear, perform zero‑adjustment again, and then measure.
① For in‑circuit resistance measurement, cut off the power supply of the tested circuit and disconnect bypass branches to open the branch containing the target resistor.
② Rotate the selector switch to the resistance "Ω" range, and select an appropriate resistance multiplier gear according to the approximate estimated value.
③ Perform Ω‑range zero‑calibration before measurement: short‑circuit the two test probes and check whether the pointer points to the Ω zero scale. If not, turn the Ω zero‑adjustment knob until the pointer reaches zero.
④ Connect the test probes to both ends of the resistor under test and observe pointer deflection. If the pointer does not stay within 1/3～2/3 of the scale range, change the multiplier gear to bring the pointer into this range (higher measuring accuracy is achieved within this interval). Note: Re‑calibrate the Ω zero position after every multiplier change before taking measurements.
⑤ Read the value at the pointer position: Resistance value = pointer reading × multiplier.
