Teardown & Repair of the Siglent SHS810 100MHz 1GS/s Portable Oscilloscope & Multimeter

In this episode Shahriar examines the failure of a Siglent SHS810 100MHz 1GS/s portable oscilloscope and multimeter. The instrument’s multimeter inputs are functional, however the neither of the oscilloscope inputs display the correct waveform. The displayed signal varied largely as soon as a coax cable is connected and the instrument is powered from an external signal source. This hints to a grounding problem. Further examination of the probes also shows large damage to the ground pads from a possible high-voltage short circuits through the shared ground between the scope inputs.

The disassembly of the unit reveals heavy damage to the ground PCB traces of the input channels. After thorough cleanup of the PCB, the ground traces are repaired using copper tape. The new ground plane corrects the problem and the scope can now be used to measure RF signals correctly.

5 comments

  1. Thanos says:

    I noticed that you did not clean the soot between smd passive components and traces in both sides. Since soot is conductive this may later lead to inaccuracies from leakage and maybe to flashover, in case that a high voltage (within the instrument highest range) is presented at the inputs. I assume the damage was caused by a high voltage at ground lead of the probes. Thanks for the video.

  2. tasweet says:

    thank you for the putting these videos together. i truly appreciate the sharing of insights and techniques. you giving to the community is a blessing.

  3. Russell says:

    What happened to the Fluke 196B teardown?

  4. Steve says:

    Excellent video as always, Shahriar.
    As a note, the Siglent SHS1000 family of portable copes (orange case instead of blue) do have isolated grounds. So if the original owner had used one of those models instead, they would still own it 🙂

  5. Alexey says:

    Very nice! Thanks for the video 😉

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