Agilent Technologies 2000 X, User Manual

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114 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
9
Triggers
You can save trigger setups along with the oscilloscope setup (see
Chapter 17 , “Save/Recall (Setups, Screens, Data),” starting on page 217).
Triggers - General
Information
A triggered waveform is one in which the oscilloscope begins tracing
(displaying) the waveform, from the left side of the display to the right,
each time a particular trigger condition is met. This provides stable
display of periodic signals such as sine waves and square waves, as well
as nonperiodic signals such as serial data streams.
The figure below shows the conceptual representation of acquisition
memory. You can think of the trigger event as dividing acquisition memory
into a pre- trigger and post- trigger buffer. The position of the trigger event
in acquisition memory is defined by the time reference point and the
delay (horizontal position) setting (see
"To adjust the horizontal delay
(position)" on page 45).
Adjusting the Trigger Level
You can adjust the trigger level for a selected analog channel by turning
the Trigger Level knob.
You can push the Trigger Level knob to set the level to the waveform's
50% value. If AC coupling is used, pushing the Trigger Level knob sets the
trigger level to about 0 V.
The position of the trigger level for the analog channel is indicated by the
trigger level icon (if the analog channel is on) at the far left side of the
display. The value of the analog channel trigger level is displayed in the
upper- right corner of the display.
Pre-Trigger Buffer
Post-Trigger Buffer
Acquisition Memory
Trigger Event
T