Tektronix, Inc. P6240, User Manual

Page: 219 / 321

Triggering on Patterns
TLS 216 User Manual
3–137
To Trigger Immediately on a Pattern
If you want to trigger as soon as possible after a pattern goes TRUE (as defined
by the logic selected), you must set the minimum time qualification possible by
doing the following steps.
1. Define the pattern, Boolean requirements, thresholds, mode and holdoff
using the methods outlined in To Trigger on a Pattern on page 3–134.
2. Press TRIGGER MENU
➞
Type (main)
➞
Pattern (pop-up)
➞
Time
Qual (main)
➞
Limit (pop-up).
3. Press Pattern Trig When (main)
➞
Time Out (side). Press Time (side).
Use the general purpose knob or the keypad to set the time limit to its
minimum value.
NOTE . The minimum time qualification of 2 ns is a value the logic scope can
typically achieve. For warranted values, consult the TLS 216 Performance
Verification and Specifications manual shipped with the logic scope.
Triggering will occur when the inputs compare TRUE and the minimum time
limit expires. Figure 3-64 shows a pattern comprising four inputs that is time
qualified to trigger as soon as possible after the pattern is recognized. (Compare
with Figure 3-65 on page 3–138 which shows >Time time qualification.)
Logic Function (AND) Becomes TRUE (HHHH)
Triggering occurs 2 ns later
Time Limit Set to Minimum
Figure 3-64: Triggering on a Pattern: Time Out Qualified