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Measurement Method
6.7 IEC Flicker
105
7.
Viewing measurement data
Checking recording conditions with the fluctuation graph
(1) Investigate the degree of fluctuation in instantaneous flicker
value S(t), which is a measure of perceived instantaneous
flicker.
VOLTAGE
The vertical and horizontal scales of the fluctuation graph change auto
matically during recording.
If you want to change the vertical scale, you can do so while recording
is in progress; however, you must first stop recording if you want to
change the horizontal scale.
Instantaneous flicker values (S(t)) are sampled at 256 points per cycle,
and are calculated without any gaps for one wave shifted over half a
wave. You can record MAX and MIN values from RMS voltage data
every half wave over the set interval.
Example: When the interval is set to 1 s:
The MAX and MIN values are recorded from 100 points of half wave
voltage data. (At 50 Hz.)
Recording start time
Shows the MAX and MIN
real-time values.
The MAX and MIN values
are recorded together.
When 3P3W3M setting:
Red: CH1
Yellow: CH2
Blue: CH3
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