User Manual

68
Pulse Trigger
This trigger is used to trigger on a positive or negative pulse with a specified width.
To set the Pulse Trigger:
1. Press the Setup button to enter the TRIGGER menu.
2. Press the Type softkey. Turn the Universal Knob to select Pulse and push the knob to confirm.
3. Press the Source softkey. Turn the Universal Knob to choose which analog channel to use for
the trigger source.
4. Turn the Trigger Level Knob to adjust the trigger level. The pulse width will be measured at
this voltage on the waveform.
5. Press the Polarity softkey to trigger on a Positive or Negative pulse. The current trigger
polarity is displayed at the upper right corner of the screen.
6. Press the Limit Range softkey. Turn the Universal Knob to select the desired condition.
 < (Less than specified time): Trigger when the measured pulse width is less than the
specified time.
For example, for a positive pulse, if you set the pulse width < 100 ns, the oscilloscope will trigger
on the following waveform:
Note: The lower trigger level cannot be larger than the upper trigger level. In the trigger state
message box, L1 means the upper trigger lever while L2 means the lower trigger level.
Positive Pulse Width
Negative Pulse Width
Trigger Level
Figure 52 - Pulse Trigger