How to capture abnormal signals among normal signals in the oscilloscope?

Capturing abnormal signals in an oscilloscope involves two aspects: the functional indicators and performance indicators of the oscilloscope:

1. The waveform capture rate index of a digital oscilloscope determines whether the oscilloscope can capture abnormal signals with a low probability of occurrence. The difference between a digital oscilloscope and an analog oscilloscope is that the analog oscilloscope collects and displays data in real time, while the digital oscilloscope needs to convert the analog signal into a digital signal before displaying it on the screen. In addition, the oscilloscope will not continue to capture waveforms during the signal processing process. This process is called dead time, which means that the digital oscilloscope will lose most of the waveforms. A digital oscilloscope with a high waveform capture rate index can greatly reduce the dead time and capture more waveforms in the same time, thus increasing the probability of capturing occasional abnormal signals.

2. A high waveform capture rate can only increase the probability of capturing abnormal signals. However, to stably display abnormal signals on the screen, an advanced oscilloscope function, namely, zone trigger, is also required. RIGOL's MSO5000/7000/8000 series oscilloscopes are all equipped with zone trigger function as standard. By marking the area where the abnormal signal appears and creating trigger rules, the abnormal signal can be stably triggered and displayed at the location where it appears, and its amplitude, pulse width and other important parameters can be measured.