Oscilloscope Practice Special 5: The Difference Between Persistence Display and Freeze Display

　　In the freeze display mode, what you observe on the screen is the superposition effect of all waveforms acquired within the total capture time of one screen, and the details of each frame of the waveform are displayed on the screen.

　　Assuming that the total capture time of a screen waveform is 50ms, in the freeze display mode, the waveform displayed on the screen is the result of the superposition of all waveforms captured within 50ms. The persistence display can control the display of waveform persistence by setting the persistence time in the [Display] menu. When the persistence time is set to 200ms, the result displayed on the screen is the result of the superposition of 4 screen waveforms.

　　In addition, the frozen display has grayscale, while the afterglow display has no grayscale. The frozen display can judge the probability of the waveform according to the brightness of the waveform. When you are observing an unstable waveform, in normal mode, if you press the [Stop] button, the result is only the latest frame of the waveform. But when you turn on the frozen display and press the [Stop] button, the waveform displayed on the screen is the waveform you see in the running state. At this time, you can clearly see every detail and can judge the probability of the waveform according to the brightness. At this time, if there are other button operations, the latest frame of the waveform will be displayed on the screen. The afterglow display has no grayscale, it is just a superposition of the historical waveform trajectory, which is used to observe the small probability of abnormal waveforms.