Fluke 125 Fluke 125 Users Manual - Page 53

Reading the Harmonics Screen, Table 3-1. Harmonics Readings cursor OFF, K-factor, Relative value

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Reading the Harmonics Screen Depending on the test tool settings the readings show different measurement units. Table 3-1 shows the readings for VOLT/AMP/WATT and CURSOR OFF . Table 3-2 shows the readings for VOLT/AMP/WATT and CURSOR ON . Table 3-1. Harmonics Readings cursor OFF Mode Main A Secondary A Main B Secondary B Volt Amp Watt V rms Hz W rms THD K-Factor THD Hz A rms Hz THD K-Factor Table 3-2. Harmonics Readings Cursor ON Mode Volt Amp Watt Main A V Hz W rms Secondary A Main B Relative value Hz (%r or %f) Angle (°) A Relative value Hz (%r or %f) Secondary B Angle (°) Relative value (%r or %f) Angle (°) 3 Harmonics Measuring Harmonics Figure 3-3. Reading the Harmonics Screen THD : total harmonic distortion is the amount of harmonics in a signal as a percentage of the total rms value (%r) or as a percentage of the fundamental (%f). K-factor : indicates the losses in transformers due to harmonic currents. Relative value : value of the bar marked by the cursor, %f as a percentage of the fundamental VOLT/AMP/WATT value, %r as a percentage of the total rms VOLT/AMP/WATT value. Angle°: the phase angle between the harmonic component and the fundamental voltage or current. 3-5

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Harmonics
Measuring Harmonics
3
3-5
Reading the Harmonics Screen
Depending on the test tool settings the readings show
different measurement units.
Table 3-1 shows the readings for VOLT/AMP/WATT and
CURSOR
OFF
.
Table 3-2 shows the readings for VOLT/AMP/WATT and
CURSOR
ON
.
Table 3-1. Harmonics Readings cursor OFF
Mode
Main A
Secondary A
Main B
Secondary B
Volt
V rms
THD
Hz
Amp
Hz
K-Factor
A rms
THD
Watt
W rms
THD
Hz
K-Factor
Table 3-2. Harmonics Readings Cursor ON
Mode
Main A
Secondary A
Main B
Secondary B
Volt
V
Relative value
(%r or %f)
Hz
Angle (
°
)
Amp
Hz
Angle (
°
)
A
Relative value
(%r or %f)
Watt
W rms
Relative value
(%r or %f)
Hz
Angle (
°
)
Figure 3-3. Reading the Harmonics Screen
THD
: total harmonic distortion is the amount of harmonics
in a signal as a percentage of the total rms value (%r) or
as a percentage of the fundamental (%f).
K-factor
: indicates the losses in transformers due to
harmonic currents.
Relative value
: value of the bar marked by the cursor,
%f
as a percentage of the fundamental
VOLT/AMP/WATT value,
%r
as a percentage of the total rms VOLT/AMP/WATT
value.
Angle
°
: the phase angle between the harmonic
component and the fundamental voltage or current.