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2-26
IM 701210-05E
2.3 Setting the Trigger
• Wave Window Trigger
This trigger is used to monitor the power supply waveform. It detects abnormalities in
the power supply (disruption, sag, serge, frequency fluctuation, voltage drop, etc.).
A reference waveform (realtime template) is created by setting a tolerance (window width)
to a waveform derived by averaging 1 to 4 cycles of waveforms before a cycle the
current waveform. The current waveform is compared against the realtime template.
If the current waveform falls outside the realtime template, a trigger is activated.
4 cycles of the waveform immediately before
Target waveform
Power supply waveform
Averaged waveform
of 1, 2, and 4 cycles
Realtime template
Averaged waveform
+ tolerance width
Compare the target waveform against
the realtime template
Trigger activated when the current waveform
falls outside the realtime template
Trigger activated here
Wave window trigger example
Disruption
(Trigger)
Sag
(Trigger)
Sag
(Trigger)
Serge
(Trigger)
ON: Use as a trigger source
OFF: Not use as a trigger source
CH1 to CH16
Cycle Frequency: Power supply frequency of the measured item
Reference Cycle
Sync. Ch : Synchronization channel
1
for starting triggers
Level: Level of the synchronization channel
Hys: Hysteresis of the synchronization channel
1. Synchronization channel: Because waveform determination is performed per cycle in wave
window trigger, synchronization signal must be retrieved from the reference channel, and the
start and end points of comparison must be detected. This reference channel is called a
synchronization channel. Sync.Ch is used to specify the synchronization channel, and Level
is used to specify the start level of the synchronization channel. Normally, Sync.Ch is set to
Auto (the channel with the smallest number among the modules that can perform wave window
trigger). However, if the trigger is not activated adequately, specify an appropriate channel.