What is crucial to remember when using an ohmmeter?

When using an ohmmeter, it is crucial to de-energize the circuit before testing. An ohmmeter is designed to measure resistance, and if the circuit is live or energized, the readings can be inaccurate and potentially dangerous. Applying an ohmmeter to a powered circuit can not only damage the meter but also pose a risk of electrical shock to the user.

De-energizing the circuit ensures that the measurement is taken in a safe environment, allowing for accurate resistance readings without interference from any voltage present in the circuit. This practice is essential for both the safety of the technician and the integrity of the measurement. Always confirming that the circuit is de-energized minimizes the risk of accidents and ensures reliable testing results.