Trigger
67
9.2.8
Runt Trigger
The runt trigger detects a pulse that crosses the first threshold but not the second. It can occur when a logic driver has
insufficient slew rate to reach a valid logic level in the time available.
Figure 9.20
Runt Trigger
•
A positive runt pulse crosses through a lower threshold but not an upper threshold.
•
A negative runt pulse crosses through an upper threshold but not a lower threshold.
To select
Runt 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
Runt
.
4.
Use the touchscreen to toggle the
Polarity
between
Positive
and
Negative
.
5.
Use the touchscreen to select the
Limit Range
.
•
<= (less than a time value)
: Trigger when the positive or negative slope time of the input signal is lower than
the specified time value.
•
>= (greater than a time value)
: Trigger when the positive or negative slope time of the input signal is greater
than the specified time value.
•
[- - . - -] (within a range of time value)
:Trigger when the positive or negative slope time of the input signal
is greater than the specified lower limit of time and lower than the specified upper limit of time value.
•
- -][- - (outside a range of time value)
: Trigger when the positive or negative slope time of the input signal is
greater than the specified upper limit of time and lower than the specified lower limit of time value.
Holdoff, coupling, and noise reject can be set in edge trigger, see the sections
for more details.
