6.7 IEC Flicker
106
Quick Start Manual
(2) Check the occurrence of IEC flicker (Pst, Plt).
GRAPH
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.
The short-term flicker indicator “Pst” indicates the degree of percepti-
bility (severity) of flicker measured over a 10-minute period.
The long-term flicker indicator “Plt” indicates the degree of perceptibil-
ity (severity) of flicker determined from successive Pst measurements
over a 2-hour period.
Plt is calculated from moving averages of Pst.
The Pst, Plt flicker value is calculated once a minute without gaps,
regardless of the set interval time.
You can confirm the contents of settings (SYSTEM-DF2) and wave-
form display (VIEW-DF1/2/3/4) during recording, but you cannot
change them.
When you want to change the settings, you must stop recording first.
Recording start time
Shows the Pst, Plt val-
ues every 10 minutes.
8.
Ending the recording interval
Use the same method as when measuring power fluctuation. (page 68)
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