Trigger
68
9.2.9
Pattern Trigger
The Pattern trigger identifies a trigger condition by looking for a specified pattern. The pattern trigger can be expanded
to incorporate delays.
Pattern durations are evaluated using a timer. The timer starts on the last edge that makes the pattern
“true”.
Potential
triggers occur on the first edge that makes the pattern false, provided that the time qualifier criterion has been met.
The oscilloscope provides 4 patterns: logical AND, OR, NAND and NOR combination of the channels. Each channel
can set to low, high or invalid.
Figure 9.21
Pattern Trigger
To select
Pattern Trigger
type:
1.
Press the Setup key or use the touchscreen controls to enter the
Trigger Menu
.
2.
Use the touchscreen to select
Type
.
3.
will appear.
–
Use the touchscreen to select
Pattern
.
4.
Use the touchscreen to select the
Logic
pattern.
5.
Press the
Source Setting
to assign one of the following to each channel:
Don’t
care
,
High
or
Low
.
–
When digital channels are turned on, the logic state of the digital channel can also be set in the source setting
dialog box.
