When using a multimeter with a low resistance setting, what must be considered to avoid circuit damage?

When measuring low resistance using a multimeter, ensuring that the circuit is de-energized is essential to prevent damage. When the multimeter is set to a low resistance range, it applies a small test voltage to the circuit to measure resistance. If the circuit remains energized, this test voltage can create a short circuit or lead to damaging other components within the circuit, such as fuses or sensitive electronic parts.

De-energizing the circuit ensures that the test is safe, as there won't be any live current flowing through the components. This practice aligns with standard safety protocols when working with electrical devices and circuits, thereby protecting both the technician and the equipment. In summary, before making resistance measurements, confirming that the circuit is powered off helps to avoid undesirable outcomes and potential damage.