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10-1
Chapter 10
Harmonics
Introduction
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, as a
percentage of all harmonics combined (rms value), or as 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 switched mode power supplies in computers, TV’s
and adjustable speed motor drives. Harmonics can cause transformers, conductors, and
motors to overheat.
Note: the number of harmonics is limited to DC and harmonics 1 … 13 for measurements
in 400 Hz power systems such as offered in Fluke 437-II. Measurement of
Interharmonics is disabled. The phase angle is not displayed. For further information
refer to the Specifications in Chapter 27.
Bar Graph Screen
To access to the Harmonics Bar Graph screen:
c
MENU
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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