A core safety practice in electrical testing is verifying that your voltage tester is functioning properlyboth before and afterperforming a test for absence of voltage. This practice is commonly summarized as"live- dead-live": test the meter on a known live source, test the circuit (dead check), then re-test on a known live source to ensure the meter didn't fail during the process.
Within OSHA-related electrical safety expectations and common field practice aligned with NETA work, this verification is emphasized especially in higher-voltage contexts, and the flash-card target here isabove 600 V.
Above this threshold, the consequences of a false "dead" reading are severe, and verification of instrument operation becomes non-negotiable.
NETA Level 2 technicians must demonstrate disciplined instrument verification habits. Even if a meter reads zero, it must be proven functional immediately afterward. This prevents relying on a meter with a blown fuse, dead battery, damaged leads, or internal failure-each of which could incorrectly indicate "no voltage" on an energized system.