If a meter's case is left open, what should you do before operation?

• A. Close the case before operating
• B. Continue with measurement
• C. Ignore and proceed
• D. Remove the meter from service

Answer: (A)

Keeping the meter enclosure closed is a safety requirement. The case acts as a protective barrier that keeps your hands and tools away from live conductors and prevents accidental contact or arcing. With the case left open, there’s a real risk of shock, arc flash, or contamination entering the internal circuitry, which can affect readings and damage the meter. Before you power it up, ensure the case is fully closed and secured so that all shielding and interlocks are in place and the measurement environment remains safe. If the case can’t be closed due to damage or missing parts, do not operate the meter and remove it from service for repair.