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Rigol DHO804 Test and Compare Thread

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gf:

--- Quote from: Martin72 on December 26, 2023, 03:40:17 pm ---Once with 50ohm termination, once blank 1Mohm, full bandwidth (200Mhz), 20Mhz limited.
Then once at 1µs/div, 1ms/div.

--- End quote ---

Hmmm... Why is there so much difference between 1.25GSa/s and 625MSa/s?

Randy222:
On the DHO804, why does the scope lose signal sync if the vertical scale is increased?
Example;
Ch1 on the internal 1kHz 3v peak signal, set trigger to 1v, but then dial up the scale to 10v/div. The trigger does not change, so why the scope lose sync on the square wave (dancing signal)?

2N3055:

--- Quote from: gf on December 26, 2023, 06:35:29 pm ---
--- Quote from: Martin72 on December 26, 2023, 03:40:17 pm ---Once with 50ohm termination, once blank 1Mohm, full bandwidth (200Mhz), 20Mhz limited.
Then once at 1µs/div, 1ms/div.

--- End quote ---

Hmmm... Why is there so much difference between 1.25GSa/s and 625MSa/s?

--- End quote ---
1µs/div as opposed to 1ms/div i would presume, not the sampling rate itself?

Martin72:

--- Quote from: gf on December 26, 2023, 06:35:29 pm ---Hmmm... Why is there so much difference between 1.25GSa/s and 625MSa/s?

--- End quote ---
If I reduce it from 1.25GSa/s  to 312MSa/s(by adding channels) at 1µs/div, nothing happens.
As the memory depth increases, so does the noise, see pictures (Auto, 10M, 50Mpts, 1Mohm termination, full bandwidth).
I'll take a closer look tomorrow or later.

gf:

--- Quote from: Martin72 on December 26, 2023, 07:46:53 pm ---As the memory depth increases, so does the noise, see pictures

--- End quote ---

Very strange. The standard deviation of noise samples should not depend significantly on the memory depth (except when the number of samples is very small).

Could this be related to the mapping of the samples to the screen?
Are the measurements taken directly from the captured samples or from the screen data?

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