Which statement about meter ratings is true?

• A. The meter should be rated for the circuit's temperature range.
• B. The meter must be rated for the circuit's current, voltage and transient levels.
• C. The meter's battery life determines its rating.
• D. The meter's rating is irrelevant to transient events.

Answer: (B)

When you pick or use a meter, its ratings tell you what electrical conditions it can safely handle and read accurately. The most complete and practical requirement is that the meter be rated for the circuit’s voltage, current, and transient levels. Voltage and current ratings ensure the meter’s insulation, input protection, and internal components can withstand the steady electrical stress without breakdown or damage, while the transient (surge or spike) rating protects the meter from short‑duration overvoltages common in real circuits. If any of these stresses exceed the meter’s ratings, you risk safety hazards, blown fuses, or distorted measurements.

Battery life matters for how long you can use the meter between charges, but it does not determine what electrical conditions the meter can safely handle. Temperature range affects performance and accuracy, but the essential requirement for safe and accurate measurement is that the meter is rated for the actual voltage, current, and transient levels present in the circuit.