Using a camera to compare them:
Based on the X-Y music plotting, I wouldn't be surprised if my DSO was not slower than the Rigol shown in this video.
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I have no idea how he has these two scopes configured. Maybe it's not a good comparison. Searching EEVBLOG, seems the topic has come up before:
https://www.eevblog.com/forum/testgear/dso-waveform-update-rate-importance-in-practice/***
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Chapters and Articles
Test Equipment Principles
Morgan Jones, in Building Valve Amplifiers (Second Edition), 2014
Refresh rate
The screen’s refresh rate has to be fast enough (>80 Hz) for flicker not to be visible, but if the oscilloscope’s memory was only refreshed at this rate we might miss momentary glitches. Ideally, we would like every waveform capture to be followed by another at the first occurrence of the user’s trigger conditions being satisfied, and for all of this data to be written to display memory. In practice, some triggers and subsequent acquisitions may be missed because the oscilloscope’s memory system is not ready to accept data. Although refresh rate can be measured easily enough in terms of waveforms per second, it is hard to specify on a data sheet because it depends on time base setting, record length, triggering, and waveform shape, so vague descriptions like “up to” and “typical” are used. It is rare for an oscilloscope to reveal its refresh rate in use, which is a shame because indication allows the user to iteratively adjust settings to maximise it if necessary. Be assured that a cheaper oscilloscope is likely to save cost by having slower memory and busses that degrade its refresh rate.
Although difficult to specify, a good subjective assessment of a basic oscilloscope’s refresh rate may be quickly made using orchestral music recorded in stereo without data compression. Using analogue audio, connect L to Ch1 and R to Ch2 (or vice versa), select XY mode, select AC auto-triggering, and observe the resulting Lissajous figure. A perfect display would be identical to that produced by an analogue oscilloscope, resembling a continuous ball of wool smoothly pulsing in size and intensity without any jumps, glitches, or discontinuities. Unlike an analogue oscilloscope, a digital oscilloscope is forced to trigger and capture input waveforms before displaying them sequentially as discrete Lissajous figures, and because music is essentially random to an oscilloscope, really basic oscilloscopes fare very badly on this test due to their poor refresh rate.