Products > Test Equipment
My Rigol DS1054Z has noise and beam thickness dependency of the vertical offset
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Miti:
A don’t know exact conditions it does that, what I know is that the trace goes thinner and thicker as I move it up and down.

Edit: Attaching some screen shots.
Fungus:
Doesn't seem normal to me. Send it back.
Njk:
Did not notice the phenomenon with mine
Miti:
And the triangle wave. I think yours is an extreme case of something they all do. I agree, you should return it.
BorisSS:

--- Quote from: noisyee on April 10, 2023, 01:13:01 am ---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.

--- End quote ---
When I set Coupling – GND in the channel menu, the beam becomes thin and does not depend on the position on the screen. So I assumed the problem is in the input amplifier. But may be you're right, not me. I don't have a schematic diagram so I don't know where the input closes to GND. May be at the ADC input.

Thanks again to everyone who is trying to help me figure out the problem. It is very important to set exactly my measurement conditions when you simulating my case on your devices. It is important that:
- Only one channel is involved.
- Acquire menu: Mode – Normal; MemDepth – Auto or 24.0M pts; Anti-aliasing - OFF.
- Channel menu: Scale – 500mV/Div; BW Limit – OFF; Probe – 10X.
- Slider on the probe must necessarily be set to 10X.
Some of you have attached screenshots in which the probe was set to 1X. But noise is lower in such case and test meander and ramp signals looks more symmetrical on my Rigol (see my screenshots). Please see how test meander will look if the probe is switched to 10X.
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