Hello,
I am in an apprenticeship for an electrical job, and on the office we have Oscilloscopes, which are galvanic seperated form ground.
I didn't knew that not all oscilloscopes are galvanic seperatet, so I connected the ground of my Hantek6022BL to an output of an full bridge rectifier and in these moment (positive probe wasn't connectet) the oscilloscope, the messured rectifier, my tower computer and the hole rest of my room went out.
After resetting my Fuse, which was an B16 Fuse (16A overload and 3 to 5 times overload current for immediate shutoff) my room had electricity again but my computer and oscilloscope and also the rectifier didn't worked. The computer came back to live after 5 minutes being sad about blowing up my expensive Computer, but the oscilloscope didn't came back to live.
The Oscilloscope have an internal short circout, atleast the computer is telling me that there is an large overcurrent on the USB port when plug in the oscilloscope.
So basically I have 4 questions:
1. does sb. know how to repair the oscilloscope, i read about someone in this forum, who had the same problem, but I can't remember, where i read it. I think th wrote sth. short about that he replaced the part D1, which I think is a kind of speccial diode directly on the Probe connectors, is this the right Part?
2. I read about some "Upgrades" which you can make to your hantek scopes th have more samples etc. are these upgrades also available for my Scope (building them in when i have opened my scope for repairing it)?
3. Am i overlooking sth., or are these grounded scopes verry dangerous, because you can kind of never know if a Power supply is properly galvanic seperatet? Is it maybe a smart idea to try to never use the ground Probe and only if there is no current shown, then messure your potential messuring Point for the ground clip first by connecting the positive messuring clip to it and look if the scope is showing something and only if it shows always 0v then connect the ground probe to the point and then the positive probe back to the point you want to messure?
4. What Protective class does such a scope have? because class it has no real grounding on the metall chassis because if you use an Laptop the chassis of the Laptop and the scope is the potential of your ground Probe which could be mains power and so be deadly, it also is not insolated (metall chassis) and it is not only low voltage because you can stick the ground probe to theoretical evvery voltage level if you don't know what you are doing (kind of what I did...)
Thanks for your Support, and yes, now i have seen the video about the dangers of an scope without propper galvanic seperation.