Tektronix 4000 Series, User Manual

Page: 146 / 326

Trigger Setup
Trigger Type Trigger Conditions
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.
Logic Trigger when a selected set of channels transition to a
selected state. Use the Clock control side-bezel button to
select unclocked (pattern) triggering, or to select a clock
channel (state triggering).
Use the Select control and the State control side-bezel
buttons to set each channel to High, Low, or Don’t Care (X).
If you have selected Clock triggering, you can set the clock
edge to rising or falling.
For unclocked triggering, by default, triggering occurs when
the selected condition goes true. You can also select
triggering when the condition goes false, or time-quali
fi ed
triggering.
You can use up to 20 channels for a logic trigger (4 analog
and 16 digital) with MSO4000 series oscilloscopes.
NOTE. Optimum Logic trigger performance is achieved by
using only analog channels or only digital channels.
128 Tektronix 4000 Series Oscilloscopes User Manual