How to Measure Distorted AC Waveforms Accurately

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Measure Distorted AC Signals

AC waveforms produced by nonlinear electrical loads can differ significantly from ideal sinusoidal waveforms. Electronic controls and other nonlinear loads can distort the waveform, affecting AC voltage measurements. Average-responding measurement techniques are calibrated to provide the expected result for sinusoidal inputs, but they can produce substantial errors when applied to other waveform shapes.

Accurate evaluation of distorted AC waveforms requires a measurement method that accounts for waveform shape rather than assuming a pure sine wave. Obtaining a representative effective AC voltage value helps engineers and technicians evaluate electrical conditions more confidently when testing equipment with nonlinear loads.

True RMS Measurement Solution

Accurately measuring distorted AC waveforms requires a measurement method that calculates the effective value of the entire waveform regardless of its shape. Unlike average-responding techniques, True RMS measurements account for waveform distortion and provide values that more accurately represent the power delivered to a resistive load. This approach is particularly important when testing circuits that contain electronic controls or other nonlinear loads. Keysight handheld digital multimeters provide True RMS measurement capabilities that help engineers and technicians obtain reliable AC voltage and current measurements across a broad range of waveform shapes. Depending on the product family, additional capabilities such as non-contact voltage detection (Vsense), low-impedance measurement (ZLOW), Smart Ω, and industrial safety ratings further support electrical troubleshooting, maintenance, and verification tasks in demanding field environments.

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