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Triggering on Waveforms
Using Trigger Delay or Pre-trigger
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Using Trigger Delay or Pre-trigger
You can begin to display the waveform some time before
or after the trigger point has been detected. Initially, you
have a half screen (6 divisions) of pre-trigger view
(negative delay).
To set the trigger delay, do the following:
5
MOVE
Hold down to adjust the trigger
delay.
Observe that the trigger icon on the screen moves to
show the new trigger position. When the trigger position
moves left off of the screen, the trigger icon changes into
to indicate that you have selected a trigger delay.
Moving the trigger icon to the right on the display gives
you a pre-trigger view. This allows you to see what
happened before the trigger event, or what caused the
trigger.
In case of a trigger delay, the status at the bottom of the
screen will change. For example:
This means that input A is used as the trigger source with
a positive slope. The 500.0 ms indicates the (positive)
delay between trigger point and waveform display.
When a valid trigger signal is found, the trigger key will be
lit and the trigger parameters appear in black.
When no trigger is found, the trigger parameters appear in
gray, ands the key light will be off.
Figure 29. Trigger Delay or Pre-trigger View
Figure 29 shows an example of a trigger delay of 500 ms
(top) and an example of pre-trigger view of 8 divisions
(bottom).
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