Recreational Vehicle (RV) Technician Practice Test

When reading voltage with a voltmeter, what is the recommended starting point?

1. The lowest voltage scale

2. Medium voltage scale

3. Highest voltage scale

4. A preset voltage scale

The correct answer is: Highest voltage scale

When using a voltmeter to read voltage, starting at the highest voltage scale is recommended. This approach is important because it prevents potential damage to the voltmeter and allows for a safe measurement of the voltage present in the circuit. If an operator starts at a low scale and the voltage exceeds that range, it can lead to an overload situation, risking the functionality of the voltmeter. By beginning with the highest scale, the technician can then progressively adjust to lower scales as needed, ensuring accurate readings without the risk of equipment damage. This practice also helps avoid any errors in the measurement, as it ensures that the operator can accurately capture high voltages without immediately risking an incorrect and possibly harmful reading.