2-15
IM 701310-01E
Explanation of Functions
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App
Index
Trigger
Hysteresis ►For the procedure, see section 6.5
If there is insufficient trigger level width and noise is present in the trigger source, the trigger
point fluctuates each time a trigger is activated. This causes the displayed waveforms to
be unstable. Again, even with a slope of the polarity opposite to that specified, noise near
the threshold value can cause the trigger to be activated. To prevent this from happening,
a certain width (hysteresis) is assigned to the specified trigger level.
The DL9000 provides a selection between
(narrow hysteresis) and
(wide
hysteresis). When
is selected, the hysteresis is increased, and fluctuation in the
trigger point due to noise can be reduced, giving a more stable waveform display.
However, this setting can make the trigger point less precise, reducing the trigger
sensitivity, so that a trigger source of low amplitude may fail to activate. With a stable
signal free of noise, or a low amplitude trigger signal, set the hysteresis to
.
Window Comparator ►For the procedure, see section 6.5
This determines whether a trigger condition based on a waveform rising edge or falling
edge, or High/Low, or a Qualify or State condition falls within (IN) or outside (OUT) a
specified range (Window).
The Window comparator can be enabled or disabled for each channel separately. The
trigger condition changes according to the Window comparator setting for the channel
set for a trigger source and so on.
For example, if the source channel of an Edge trigger has the Window comparator
enabled, the trigger can be activated according as the source channel waveform is within
or outside the specified area.
2.4 Triggers
