Elevator Mechanic Practice Exam

How do you measure AC voltage on a Digital Multimeter?

1. Function to DCV, Red lead to Volt ohm, Black lead to common

2. Function to VAC, Red lead to Volt ohm, Black lead to common

3. Function to Ohms, Red lead to Volt ohm, Black lead to common

4. Function to VDC, Red lead to Volt ohm, Black lead to common

The correct answer is: Function to DCV, Red lead to Volt ohm, Black lead to common

The correct method to measure AC voltage on a Digital Multimeter involves setting the function to VAC, which specifically calibrates the meter to measure alternating current voltage. The red lead should be connected to the Volt ohm terminal, while the black lead connects to the common terminal. This configuration is essential because it ensures that the multimeter can accurately read and display AC voltage, which differs from options that suggest using DC voltage settings or resistance measurements. Understanding the significance of measuring AC versus DC voltage is crucial in electrical work, particularly in applications related to elevators, where alternating current is commonly used. Hence, recognizing the proper settings and connections on the multimeter is vital for safety and accuracy while performing electrical diagnostics.