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10-1
Chapter 10
Harmonics
Introduction
Harmonics measures and records harmonics and interharmonics (Fluke 434) 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. Results may be viewed in a Bar Graph
display, a table, 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.
Bar Graph Screen
To access to the Harmonics Bar Graph screen:
c
MENU
d