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Dithering on 8-bit scope?
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David Hess:

--- Quote from: Circlotron on August 19, 2023, 10:27:13 pm ---And by dithered, I mean add a high frequency triangular signal of exactly 1 LSB peak to peak to the incoming waveform and then measure the duty cycle of the resulting LSB as it jiggles between two adjacent values to see where it lies between those two LSB values.
--- End quote ---

The noise level at the input of the ADC is usually high enough by itself that no additional dithering signal is necessary.

Some old DSOs, like the Tektronix 2232 series, have a low enough noise that the quantization noise of the ADC shows up in the output, but this is not the common case.
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