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10-1 

Harmonics measures and records harmonics and interharmonics up to the 50

th

. Related 

data such as DC components, THD (Total Harmonic Distortion), and K-factor are 

measured. Harmonics are periodic distortions of voltage, current, or power sinewaves. A 

waveform can be considered as a combination of various sinewaves with different 

frequencies and magnitudes. The contribution of each of these components to the full 

signal is measured. Readings can be given as a percentage of the fundamental, or as a 

percentage of all harmonics combined (rms value). Results may be viewed in a Bar 

Graph display, a Meter screen, or a Trend display. Harmonics are often caused by non-

linear loads such as DC power supplies in computers, TV’s and adjustable speed motor 

drives. Harmonics can cause transformers, conductors, and motors to overheat. 

To access to the Harmonics Bar Graph screen: 

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