Don't Just Trigger, But Trigger Smart

Figure 1: The runt pulse and non-monotonic edge anomalies
in this signal are not apparent with a simple edge trigger.

In an earlier post, we looked at some of the basics of oscilloscope triggering and noted that there are two broad classes of triggers: simple triggers that sense particular characteristics of the input signal (transition edges, pulse widths, and so on), and more complex triggers that let you zero in on more specific attributes of the signal based on timing and amplitude parameters.

Oscilloscope Basics: Triggering

At some point, it's likely you've had the experience of capturing a waveform on your oscilloscope only to see a wildly unstable trace displayed on the screen. Chances are that you hadn't adjusted the triggering correctly. Let's take a brief look at what triggering is and why it's important in an oscilloscope. Trigger modes determine when the oscilloscope acquires and what is displayed.