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Lower peak of wave form much thicker than the upper one in Rigol DS1104Z Plus

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7AudioBB:
Can someone tell me why the bottom part of this square wave much thicker than the top? I'm using the built in 1kHz square wave source with a probe set to 10x. The wave is captured with the 'Auto' button. In YouTube other people don't seem to have this issue with the same type of oscilloscope when 'Auto' is pressed.  For some reason at a lower position all waves have a thicker line at the bottom. If I move the position to 0Volts, it looks normal. Why is this happening? Is it normal, or my (new) Oscilloscope has a problem? Please see the screenshot below:



RoGeorge:

--- Quote from: 7AudioBB on March 17, 2024, 03:02:36 am --- If I move the position to 0Volts, it looks normal. Why is this happening? Is it normal, or my (new) Oscilloscope has a problem?
--- End quote ---

Not normal.  Try a self calibration, then test again.  If that doesn't fix it, return the oscilloscope and ask for a replacement or for a refund.

To run the self calibration, unplug all the probes from the front panel of the oscilloscope, leave the oscilloscope running like that for half an our (to get to thermal equilibrium), then press Utility -> Down arrow -> Self-Cal -> Start in order to start the self calibration.  Let it finish the procedure, it will take about 10-15 minutes or so, don't interact with the oscilloscope during self-calibration.

After it finishes (it will write a calibration complete message at the end), turn the oscilloscope off (from the power button), and on again.  Plug the probes, and check the square wave signal again.

Aldo22:
Is this also the case on other channels?


--- Quote from: 7AudioBB on March 17, 2024, 03:02:36 am ---For some reason at a lower position all waves have a thicker line at the bottom. If I move the position to 0Volts, it looks normal.

--- End quote ---
You mean when you move the 0V position to the vertical center of the graticule? Because 0V is where the yellow arrow (on the left) is.

To be on the safe side, you could also reset the settings (I don't have a Rigol, I'm just guessing).

Function Inspection
1. Press Storage -> Default to restore the oscilloscope to its default configuration.

Anthocyanina:
this happened before to another person. try getting a replacement. that's defective behaviour.

here's a link to the other person's thread

https://www.eevblog.com/forum/testgear/my-rigol-ds1054z-has-noise-and-beam-thickness-dependency-of-the-vertical-offset/

Njk:

--- Quote from: 7AudioBB on March 17, 2024, 03:02:36 am ---Can someone tell me why the bottom part of this square wave much thicker than the top?
--- End quote ---

Seems you're not alone
https://www.eevblog.com/forum/testgear/my-rigol-ds1054z-has-noise-and-beam-thickness-dependency-of-the-vertical-offset/msg4805633/#msg4805633

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