Tektronix CSA7404B, User Manual

Page: 169 / 438

Triggering
CSA7000B Series & TDS7000B Series Instruments User Manual
3- 101
Overview Control elements and resources To trigger on setup/hold time violations (Cont.)
Set the setup
and hold times
To set the setup time and the hold time relative to the clock:
8. Touch Setup Time and use the multipurpose knobs or
keypad to set the setup time.
9. Touch Hold Time, and use the multipurpose knobs or
keypad to set the hold time. See Figure 3--27 on
page 3--102
.
Positive setup time always leads the clock edge; positive
hold time always follows the clocking edge. Setup time
always leads the hold time by at least 2 ns (T
S
+ T
H
≥
2 ns).
Note . Attempting to set either time to reduce the 2 ns limit
adjusts the other time to maintain the limit.
In most cases, you will enter positive values for both setup
and hold time. Positive values set the instrument to trigger if
the data source is still settling inside the setup time before
the clock or if it switches inside the hold time after the clock.
You can skew this “setup/hold violation zone” that the setup
and hold times form by entering negative values. See
Figure 3--26 on page 3--82.
Logic qualify
the trigger
10. To logic qualify the trigger, see Logic Qualify a Trigger
on page 3--102.
To set mode
and holdoff
11. Mode and holdoff can be set for all standard trigger
types.
See To set holdoff on page 3--74 and To select the
trigger mode on page 3--71 for mode and holdoff
setup. To learn more about trigger mode and
holdoff, see Trigger Modes on page 3--65 and
Trigger Holdoff on page 3--66.