Also now for some strange reason, I can detect the waveform of the main transformer of the PSU with a probe next to the PSU vents with back cover on. I think that this wasn't the case before, but I don't really remember holding the probe to the back of the PSU.
A simple one that I'll probably try first is a belly strap.
What does term "belly strap" mean in this context?
I''ll do a trial to a test Nickel painted plastic, with a mix of HCL (conc. 7%) and H2O2 (conc. 35%).
From wikipedia read that the Nitric oxid is very well to Nickel dissolution, populate product about this is the "aqua forte".
...
I painted with Nickel spray a small plastic and I try to removed today by a mix of HCL (conc. 7%) and H2O2 (conc. 35%). This solution is usual for cooper removed from my diy pcb's.
Unfortunately, nothing! I leaved it 4 hours and nothing! Nickel seems not to react with this solution. Perhaps it needs to warm but it is very complex for now.
Now, I am looking about Nitric oxid.
I didn't get nitric oxide, yet. I am looking for.
I found a super market product (tuboflo) that contains nitric oxide but contains and NaOH also.
Hello, last time I was here this thread had like 50-60 pages, now it is 135!
Wanted to ask has anyone fixed their SDS 7102 noise problems? Did Owon make a new PSU board which was touted to be the route? Any other ideas?
Hello, last time I was here this thread had like 50-60 pages, now it is 135!
Wanted to ask has anyone fixed their SDS 7102 noise problems? Did Owon make a new PSU board which was touted to be the route? Any other ideas?
Today there is new PSU and adapter board. (have been some time)
Also there is solutions for these manufacturing versions what show extra high ground RF noise.
It need also here remember that IF signal is clean in oscilloscope BNC input there have not been any noise issue related to this "noisy GND" issue.
Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions.
The new PSU & Adapter board that rf-loop said is the Adapter Ver. 3.2 or 3.3 (the only difference is a smd bypass capacitor) and the PSU with unkonwn mark that Owon produce after PSU PCB-T115-J Rev.3.
Owon sends a kit that including the new psu board and one smd capacitor (https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg257623/#msg257623), but this is OK if you have adapter version 3.2, if you had an older version than 3.2 you need a new adapter version or to modificate it.
For that the best solution is to communicate with your Owon dealer.
Here are the photos of these new boards: https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg273905/#msg273905
https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg274030/#msg274030
If you had the adapter version 3.2, there is no need to take the 3.3 version, you can put the smd alone.
With these boards and a flat ferrite to flat tft display cable, the noise decrease to 25-35mV (10X).
Member like rf-loop and Siri have presented some modifications to older adapters with success. Have these wonderfull projects to my mind, I had doing some trials to decrease my gnd-noise and I had success.
Look the following links.
PSU PCB-T113-J Rev.6 (through-hole components) : https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/?action=dlattach;attach=57753;image
Suggestion to PCB-T115-J rev4 PSU board = https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg276411/#msg276411
Adapter Version 3.0, first modifications = https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg271798/#msg271798
Adapter Version 3.0, last modifications = https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg290177/#msg290177
https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg289496/#msg289496
There are many adapter versions, I think older than 3.0.
Right, if you have adapter version 3.2 there is no need to change it to 3.3
When you have bought the SDS7102 or what serial number without 3 last digits have you?
Please do it this test and tell us how many mV: https://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg255469/#msg255469
There isn't the flat ferrite in Owon kit. In early versions of Owon this ferrite including, there isn't to the older versions.
Here is a picture:
"Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions."
It need also here remember that IF signal is clean in oscilloscope BNC input there have not been any noise issue related to this "noisy GND" issue.
Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions.
"Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions."
My original text:QuoteIt need also here remember that IF signal is clean in oscilloscope BNC input there have not been any noise issue related to this "noisy GND" issue.
Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions.
And I can stay behind these my word.
"Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions."
My original text:QuoteIt need also here remember that IF signal is clean in oscilloscope BNC input there have not been any noise issue related to this "noisy GND" issue.
Owon have extremely low noise front end. There is available lot of tests about it. Even with these "noisy GND" versions.
And I can stay behind these my word.
Are you trying to see that I am doing something wrong? What do you mean by "if signal is clean ..." ? Are you saying that I am doing something to pollute the signal? If yes then please please show me how to "unpollute" it. I only want it to work after all
Here is a picture: