Which of the following is a function of a digital multi-meter?

A digital multi-meter (DMM) is a vital tool for electrical technicians and engineers, offering a variety of measurement capabilities. High input impedance is a principal function of a digital multi-meter, allowing it to measure voltages without drawing significant current from the circuit. This characteristic is crucial when measuring sensitive components or small signals, as it ensures accuracy by minimizing the impact of the measuring device on the circuit itself.

By having a high input impedance, the digital multi-meter can effectively measure voltages across components without significantly altering their behavior, which is especially important in electronic circuits. This capability enables technicians to accurately diagnose issues, perform maintenance, and ensure the reliability of electrical systems.

While other functions such as low impedance, fast meter reaction time, and go or no-go indications are present in various types of meters, the hallmark feature of a digital multi-meter that distinguishes it in the context of electrical measurements is its high input impedance. This functionality is what makes the DMM an essential tool for both diagnostics and routine measurement tasks in electrical work.