What does an open-circuit test measure in a thermocouple arrangement?

What does an open-circuit test measure in a thermocouple arrangement?

• A. The potential millivoltage produced by the thermocouple when it is not under load
• B. The potential millivoltage that can be maintained under a load when powering a coil
• C. The voltage measured when the circuit is closed and under load
• D. The voltage drop-out voltage at which the pilotstat coil releases the valve

Answer: (A)