Triggering 4
InfiniiVision 7000B Series Oscilloscopes User’s Guide 101
In either Auto or Normal mode, the trigger may be missed completely
under certain conditions. This is because the oscilloscope will not
recognize a trigger event until the pre- trigger buffer is full. Suppose you
set the Time/Div knob to a slow sweep speed, such as 500 ms/div. If the
trigger condition occurs before the oscilloscope has filled the pre- trigger
buffer, the trigger will not be found. If you use Normal mode and wait for
the trigger condition indicator to flash before causing the action in the
circuit, the oscilloscope will always find the trigger condition.
Some measurements you want to make will require you to take some
action in the device under test to cause the trigger event. Usually, these
are single- shot acquisitions, where you will use the [Single] key.
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