What does a digital multimeter measure in HVAC systems?

A digital multimeter is an essential tool in HVAC systems because it measures voltage, current, and resistance, which are critical parameters for diagnosing and troubleshooting electrical components within heating, ventilation, and air conditioning systems.

Measuring voltage allows technicians to verify that electrical supply levels are correct, ensuring that components like compressors, motors, and controls receive the proper power to operate effectively. Current measurements are also crucial, as they help determine if components are drawing the expected amount of electrical current, which can indicate potential issues such as overloads or faults. Additionally, resistance measurements are useful when checking for continuity in circuits, assessing the condition of insulation, and testing the winding of motors or transformers.

These measurements facilitate a thorough understanding of the electrical health of HVAC systems, enabling technicians to pinpoint problems accurately and perform necessary repairs or adjustments. In contrast, other choices, like measuring temperature, flow rate, and power consumption, involve different tools or methodologies and do not fall within the direct function of a multimeter.