How to ? Set up triggering from the Front Panel
1. Set the acquisition system to Run (the Run/Stop contro l is lighted), and set the vertical and h orizontal
controls appropriately for the signal you want to acquire.
2. Push the Edge button to select edge triggering. Pushing Advanced opens the Trigger control window
to set up other trigger types.
3. Push the Slope button to toggle between Positive and Negative:
Pos. Triggers on a rising edge (positive-going) signal.
Neg. Triggers on a falling edge (negative-going) signal.
Pos + Neg. Triggers on both edges of the signal.
You can als
o set the Polarity in the Trigger control window.
4. To manually change the trigger level for edge triggers (or certain threshold levels for logic or pulse
triggers
), turn the front-panel Level knob. You can also set the Level in the Trigger control window.
5. To quickly set the edge trigger level to 50% of the waveform voltage range, push the Level knob. The
instrum
ent sets the trigger level to the halfway point between the peaks of the trigger signal. This
function has no effect for the other trigger types.
You can
also click Set 50% in the Trigger control window.
6. Push the Trigger left and right arrow button to select a Source:
Ch 1 through Ch 4. These are the input channels. The channel you select as a trigger source
will function whether it is displayed or not.
Ext. This is a fifth, nondisplayable auxiliary (external) trigger source. To use the auxiliary trigger,
connect the source to the front-panel Auxiliary In connector.
Line. This is the AC line voltage. The oscilloscope is used to generate the trigger and you do not
have to input a signal. The trigger level is fixedatzerovolts.
7. From the Trig menu select Edge Setup to set the Coupling for an A or B Event main trigger:
DC. Passes both AC and DC components of the input signal.
AC. Passes only the AC components of an input signal.
HF Reject. Attenuates signals above 30 kHz.
LF Reject. attenuates signals below 80 kHz.
Noise Rej. Provides lower sensitivity, reducing the chance of falsely triggering on noise.
8. Push the front-panel Mode button to toggle between normal and automatic trigger modes:
Norm (Normal). Requires a valid trigger event to acquire a waveform.
Auto (Automatic). Acquires a waveform even if no valid trigger event occurs.
NOTE. Be aware that in Auto mode, the acquired waveforms may not be triggered.
638 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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