Tektronix MDO3012, User Manual

Page: 115 / 243

Trigger Setup
Selecting Triggers
Trigger Type Trigger Conditions
Edge Trigger on a rising edge, a falling edge, or both edges,
as de
fi ned by the slope control. Coupling choices are
DC, LF Reject, HF Reject, and Noise Reject.
Edge triggers are the simplest and most commonly
used trigger type, with both analog and digital signals.
An edge trigger event occurs when the trigger source
passes through a speci
fi ed voltage level in the speci fi ed
direction.
Sequence
(B Trigger) (not
available with an
edge slope of
Both )
Combine an edge A Event (Main) trigger with the B
Event (Delayed) trigger to capture more complex signals.
(See page 65,
Act on Event .)
Time. After the A Event occurs, the trigger system waits
the speci fi ed amount of time, and then looks for the B
Event before triggering and displaying the waveform.
Events. After the A Event occurs, the trigger system
looks for a speci fi ed number of B Events before
triggering and displaying the waveform.
Pulse Width Trigger on pulses that are less than, greater than, equal
to, or not equal to a speci
fi ed time. Additionally, you can
trigger when a pulse width is within or outside a range of
two different speci
fi ed times. You can trigger on positive
or negative pulses. Pulse width triggers are primarily
used on digital signals.
Timeout Trigger when no pulse is detected within a speci fi ed
time. The signal stays above or below (or either above
or below) a set value for a set amount of time.
Runt Trigger on a pulse amplitude that crosses one threshold
but fails to cross a second threshold before recrossing
the
fi rst. You can detect positive or negative (or either)
runts, or only those wider than, less than, greater than,
equal to, or not equal to a speci
fi ed width. Runt triggers
are primarily used on digital signals.
MDO3000 Series Oscilloscopes User Manual 93