Products > Test Equipment
My Rigol DS1054Z has noise and beam thickness dependency of the vertical offset
BorisSS:
I recently purchased a Rigol DS1054Z to replace my unpretentious Hantek DSO2C10. Model and Version are at the attached screenshot (pict.1). When I tried to calibrate the 10X probe, my Rigol showed a very strange effect (pict.2). The upper and lower shelves of the test meander differ significantly in thickness. I did factory reset, reset to default, auto-calibration, but nothing helped. To exclude the influence of the built-in test signal generator, I connected Rigol to an external sawtooth wave generator and saw that the beam thickness gradually changes from the top to the bottom of the screen (pict.3).
Then I disconnected probe and step by step made vertical offset from top to the bottom of the screen by using Vertical Position knob. The thickness of the beam and the noise changed from min 20mV at the top to max 180-200mV at the bottom of the screen (pict.4).
The conditions of the measurements were:
- Nothing was connected to the inputs;
- The First channel was ON only;
- Channel menu: Scale – 500mV/Div; Coupling – AC; BW Limit – OFF; Probe – 10X; Invert – OFF; Volts/Div Coarse; Unit – [V].
- Horizontal: Scale – 100us/Div; Dalayed – OFF; Time Base – YT.
- Acquire menu: Mode – Normal; MemDepth – Auto; Anti-aliasing - OFF.
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).
All of four channels have the same effect. But it appears if only one of any channel is enabled. Switching between AC -DC in the channels menu doesn't change anything. But if choose GND in the channel menu, the beam thickness and noise voltage becomes min (20mV) and not depend on the vertical offset. I guess that the problem is in the all four input amplifiers circuit of DS1054Z.
Is this a defect of my oscilloscope only, or are all DS1054Z like this? If anyone has the same DS1054Z, could you please check how it looks on your oscilloscope?
Thanks in advance,
Boris.
PS: Link to video, but the sound is in Russian language: https://cloud.mail.ru/public/V893/WAqkPGPP1
PSS: Sorry for mistakes. English is not my native language))
Martin72:
Hi,
Concerns the signal comparisons between rigol and hantek:
The rigol has much more memory depth and sample rate than the hantek, as can be seen in the pictures.
If I remember correctly, you can set the memory on the rigol to manual.
Set it to the smallest value, then the signal should look "thinner".
BorisSS:
--- Quote ---Concerns the signal comparisons between rigol and hantek:
The rigol has much more memory depth and sample rate than the hantek, as can be seen in the pictures.
If I remember correctly, you can set the memory on the rigol to manual.
Set it to the smallest value, then the signal should look "thinner".
--- End quote ---
Thank you Martin72. You are exactly right. But the goal of my topic was not to compare Rigol vs Hantek)) I want to understand, is it specifically my Rigol that has such a defect, or does DS1000 model range have beam thickness and noise dependces on the beam position on the screen?
2N3055:
--- Quote from: BorisSS on April 09, 2023, 09:14:22 pm ---
--- Quote ---Concerns the signal comparisons between rigol and hantek:
The rigol has much more memory depth and sample rate than the hantek, as can be seen in the pictures.
If I remember correctly, you can set the memory on the rigol to manual.
Set it to the smallest value, then the signal should look "thinner".
--- End quote ---
Thank you Martin72. You are exactly right. But the goal of my topic was not to compare Rigol vs Hantek)) I want to understand, is it specifically my Rigol that has such a defect, or does DS1000 model range have beam thickness and noise dependces on the beam position on the screen?
--- End quote ---
No, there should not be difference in trace "thickness" with more negative value (difference between trace at bottom and top of the screen). If you bought it as new and if there is any chance to return it for warranty repair/replacement I would try that first.
If not, then try a factory reset and self cal again.. Just in case..
Martin72:
--- Quote --- or does DS1000 model range have beam thickness and noise dependces on the beam position on the screen?
--- End quote ---
Ah, I overlooked this.
Navigation
[0] Message Index
[#] Next page
Go to full version