Medical ScopeMeter
Waveform Triggers
45
Missing Pulses
The next example is about how to find missing pulses in a train of positive pulses. In this
example, it is assumed that the pulses have a 100 ms distance between the rising edges. If the
time accidentally increases to 200 ms, a pulse is missing.
To set the test tool to trigger on such missing pulses, let it trigger on gaps bigger than 110 ms:
1. Press
T
to show the TRIGGER key labels.
2. Press
4
to open the TRIGGER OPTIONS menu.
3. Use the cursor and
E
to select
Pulse Width on A
and open the TRIGGER ON PULSE
WIDTH menu.
4. Use the cursor and
E
to select the positive pulse icon to trigger on a positive pulse, then
jump to
Condition
.
5. Use the cursor and
E
to select
>t
and jump to
Update
.
6. Use the cursor and
E
to select On Trigger and exit the menu.
The test tool is now prepared to trigger on pulses that are more than a selectable time in
duration. Observe that the trigger menu at the bottom of the screen has been adapted to set the
pulse condition. See
.
To set the pulse width to 400
μ
s:
7. Press
1
to enable the cursor and adjust the pulse width.
8. Use
h i
to select
400
μ
s
.
Figure 30. Trigger on Missing Pulses
