Wiring and Measurement Methods of Multimeter
① Correct Wiring The jacks or terminals on the multimeter panel are marked with polarity symbols. For DC‑measurement applications, ensure correct polarity to avoid reverse connection. When measuring resistance or identifying diode polarity with a multimeter, note that the "+" jack connects to the negative terminal of the internal battery.
For current measurement, the multimeter shall be connected in series with the circuit. For voltage measurement, the multimeter shall be connected in parallel with the circuit.
② Correct Measurement Range Setting Measurement range setting involves selection of measurement function and measuring range. Before measurement, select the appropriate gear according to the measured quantity and its approximate magnitude.
Multimeters feature multiple measurement functions and ranges. Improper gear adjustment may cause severe instrument damage. For instance, damage may occur if the ohm or current range is selected for voltage measurement, or if a low‑range gear is used for high‑voltage / high‑current measurement.
③ No Live‑circuit Resistance Measurement Resistance measurement must not be performed on live circuits. Otherwise, measurement accuracy will be compromised and the instrument may be burnt out.
④ Do Not Switch Ranges Under Live Conditions Do not switch current or voltage ranges while the circuit is live, especially under high‑voltage and high‑current conditions, to prevent damage to the selector switch.
