Tektronix CSA7404B User Manual page 168

Triggering
Overview To trigger on setup/hold time violations (Cont.)
Define the data 3. To select the channel that is to contain the data signal,
source
touch Data Source, and select the source from the list.
Note. Do not select the same channel for both the data
and clock sources.
Define the clock 4. To select the channel that is to contain the clock signal
source and
and the edge to use to clock, touch Clock Source, and
edge
select the source from the list.
Do not select the same channel for both the data and
clock sources.
5. To select the edge to use to clock, select either Pos or
Neg from the Clock Edge window.
Set the data and To set the transition levels that the clock and data must cross
clock levels to be recognized by the instrument:
6. Touch Data Level and use the multipurpose knobs or
keypad to set the data level.
7. Touch Clock Level and use the multipurpose knobs or
keypad to set the clock level.
Note. You can set the levels to a value appropriate to
either TTL or ECL logic families. To do so, touch either
the Data Level or Clock Level, and select the keypad;
touch either TTL or ECL.
The instrument uses the clock level that you set to
determine when a clock edge occurs. The instrument
uses the point the clock crosses the clock level as the
reference point from which it measures setup and hold
time settings.
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Control elements and resources
CSA7000B Series & TDS7000B Series Instruments User Manual