Checking Circuit Continuity
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- Recommended practice: Expect less than 2 ohms of resistance for most wires.
- Ohmmeter low-resistance resolution (approximately 0.1 ohm) limits its use to circuits carrying less than approximately 5 amperes. This is due to the fact that very small resistances, below the resolution of a Digital Multimeter, cause significant voltage loss in higher current circuits.
- The Digital Multimeter applies a small amount of voltage to the circuit or component to calculate resistance. As a result, Digital Multimeter ohmmeters are very sensitive to any level of voltage present. Voltage present in the circuit will corrupt the Digital Multimeter reading.