Tektronix, Inc. P6240, User Manual

Page: 239 / 321

Triggering on a Sequence
TLS 216 User Manual
3–157
H
The end pattern becomes TRUE. (Had the end pattern became TRUE before
the timer had expired, the logic scope would have rearmed its trigger system
and waited for a new start pattern to occur.)
In contrast to Time Out, all other trigger qualifiers (> Time, < Time, In Range,
and Out of Range) would trigger at the time the second pattern compares TRUE.
For instance in the example above, switching time qualification to:
H
> Time would cause the trigger point to occur at the point the end pattern
becomes TRUE in Figure 3-71, since the 500
m
s between start and end
patterns is greater than the 400
m
s set.
H
< Time would also cause the trigger point to occur at the point the end
pattern becomes TRUE, if you increase the time limit set in side menu so the
500
m
s between start and end patterns is less than the time qualification.
To Trigger on a Time-Range Qualified Sequence
To trigger on a sequence of two TRUE patterns where the second (end) pattern
becomes TRUE (relative to the first pattern) at a time that falls inside or outside
a time range (window) you specify, do the following steps:
1. Define the start and end pattern levels, logic functions, and thresholds, and
the trigger mode and holdoff using the methods outlined in To Trigger on a
Sequence on page 3–150.
2. Press TRIGGER MENU
➞
Type (main)
➞
Sequence (pop-up)
➞
Time
Qual (main)
➞
Range (pop-up)
3. Press Sequence Trigger When (main)
➞
Lower Limit (side).
4. Use the general purpose knob or keypad to set the lower time limit from
when the pattern becomes TRUE in the side menu.
5. Press Upper Limit (side).
6. Use the general purpose knob or keypad to set the upper time limit from
when the pattern becomes TRUE in the side menu.
7. Press In Range or Out of Range (side). See Table 3–10 on page 3–148 to
select the time qualifier that is appropriate to your application.
Triggering occurs at the point the end pattern becomes TRUE at a time that
meets the In Range or Out of Range time constraint. See the discussion
immediately preceding this procedure for more information.