About the oscilloscope I posted a page back. I am not so sure right now whether it really is a truly isolated type. It does says it is but in some of the buyers comments elsewhere they complain that they are not isolated at all. So if you have that model in mind ask the seller for the information. Just to be sure.
The best would be to ask the Hantek Service team by writing them http://hantek.com/support i.e. what is the isolation impedance (resistance) between any two input channels BNC ground connections? The user manual is here http://www.hantek.com/Product/Hantek6000BX/HT6004BX_Manual.pdf and Hantek puts it in the Automotive Diagnostic Exuipment category series. I could not find a specification on the isolation resistance between the channel Grounds, only the usual input impedance is given for all the 4 channels (1 MOhm, 25 pF). EDIT: Just found this video on the scope and it turns out the channel grounds are not isolated from each other. under the video https://www.youtube.com/watch?v=IbnqMJW1z-0 there is this question Sukhdeo Singh (2 years ago (edited) Sir i want to know that wether the channels are isolated to each other. ie. The ground points of the probes are isolated to each other? sailorbob74133 (2 years ago (edited) No the channels on the scope share a common ground This means the Banggood or other sellers either cheat or mistranslate specifications for marketing purposes. Gyula
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