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My Rigol DS1054Z has noise and beam thickness dependency of the vertical offset

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BorisSS:

--- Quote ---Someone
Run a self-calibration, fixes many problems like this.
--- End quote ---
My thanks to your advise Someone. But I already wrote that I did it twice before I turned to you for help))

Someone:

--- Quote from: BorisSS on April 10, 2023, 12:02:39 am ---
--- Quote ---Someone
Run a self-calibration, fixes many problems like this.
--- End quote ---
My thanks to your advise Someone. But I already wrote that I did it twice before I turned to you for help))

--- End quote ---
You said lots of things, was the self calibration run after warm up? has the problem changed over temperature?

BorisSS:

--- Quote ---You said lots of things, was the self calibration run after warm up? has the problem changed over temperature?
--- End quote ---
How long do I have to wait to be sure that the problem does not disappear after warming up? Twenty minutes or more have passed before factory reset, calibration and measurements. Is that enough or not?

Miti:
Yeap, three at work and one at home, they all do that. maybe someone smarter than I can explain this behavior.

Miti

noisyee:

--- Quote from: BorisSS on April 09, 2023, 08:33:53 pm ---Then I zoomed beam that was at the bottom of the screen to 50mV/Div and 5ns/Div I saw that it's not a statistic noise but continuous wave with 125Mgz frequency (pict.5) (Attachment Link) .

--- End quote ---

Exact 125MHz indicates it may be the interleave spur of the ADC. The DS1000Z, if I remember correct, use HMCAD1511, which use 8 small ADCs internally interleaved to act as single 1GSPS, dual 500MSPS, or quad 250MSPS ADCs.
Maybe try different vertical scale to see if the noise is scale dependent.

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