Agilent Technologies 7000B Series User Manual page 101

7000b series

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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.

InfiniiVision 7000B Series Oscilloscopes User's Guide