Fluke 125 Fluke 125 Users Manual - Page 49

Harmonics, Introduction, Measuring Harmonics

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Chapter 3 Harmonics Introduction In the Harmonics function the test tool measures harmonics to the 33rd (for 400 Hz up to 25th). 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. Harmonics power distribution systems are often caused by non-linear loads such as switched mode DC power supplies in computers, TV's and adjustable speed motor drives. Harmonics can cause transformers, conductors, and motors to overheat. Measuring Harmonics You can display harmonics of: • Voltage measurements on Input A • Current measurements on Input B • Power measurements calculated from Voltage measurements on Input A and Current measurements on Input B. In the Harmonics mode the test tool always uses the AUTO mode. The vertical sensitivity range and the time base range are automatically adjusted to the most suitable range for the applied input signal. The ranging keys (mV V and s TIME ns) and the AUTO key are locked. Input A is forced to measure voltage, input B is forced to measure current. 3-1

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3-1
Chapter 3
Harmonics
Introduction
In the Harmonics function the test tool measures
harmonics to the 33
rd
(for 400 Hz up to 25
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.
Harmonics power distribution systems are often caused by
non-linear loads such as switched mode
DC power
supplies in computers, TV’s and adjustable speed motor
drives. Harmonics can cause transformers, conductors,
and motors to overheat.
Measuring Harmonics
You can display harmonics of:
•
Voltage measurements on Input A
•
Current measurements on Input B
•
Power measurements calculated from Voltage
measurements on Input A and Current measurements
on Input B.
In the Harmonics mode the test tool always uses the
AUTO mode. The vertical sensitivity range and the time
base range are automatically adjusted to the most suitable
range for the applied input signal. The ranging keys
(
mV
V
and
s TIME ns
) and the
AUTO
key are locked.
Input A is forced to measure voltage, input B is forced to
measure current.