136 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
10 Triggers
• Mode — Select Auto to automatically trigger when the specified trigger
condition has not occurred for some period of time. Select Trig'd to turn off
automatic triggering.
When triggers are not occurring, you can use the [Force] key to trigger on
anything, acquire, and display captured data.
• Conditioning... — These options include coupling (similar to analog input channel
coupling but affecting the trigger input only), holdoff, and external
(AUX TRIG IN) input options.
See
Chapter 11, “Trigger Mode and Conditioning,” starting on page 153 for more
information on these options.
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 47).
Adjusting the Trigger Level
The position of the trigger level for an analog channel is indicated by the trigger
level icon at the far left side of the display (if the analog channel is on). The
value of the analog channel trigger level is displayed in the trigger badge.
To adjust the trigger level, you can do any of these:
• Turn the Trigger Level knob.
You can also push the Trigger Level knob to set the level of all displayed analog
channels to the waveform's 50% value. If AC coupling is used, pushing the
Trigger Level knob sets the trigger level to about 0 V.
Pre-Trigger Buffer
Post-Trigger Buffer
Acquisition Memory
Trigger Event
To Next Page
Loading...
