Final answer:
The meter that should be used when troubleshooting an open circuit is the ohmmeter.
Step-by-step explanation:
The meter that should be used when troubleshooting an open circuit is the ohmmeter. An ohmmeter is an instrument used to measure the resistance of a component or device. It is connected across the component that is being tested, and it measures the voltage difference across the component to determine its resistance.
For example, if an open circuit is suspected in a wire, the ohmmeter can be connected to both ends of the wire. If the resistance reading is infinite or very high, it indicates an open circuit. On the other hand, if the resistance reading is close to zero or very low, it indicates a short circuit.
Therefore, the best meter to use for troubleshooting an open circuit is the ohmmeter because it directly measures resistance and can help identify the location or presence of an open circuit in a circuit or component.