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New bench scope - Fnirsi 1014D, 7", 1GSa/s

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tunk:
Another review:

Crjbroker:
Hello every body,

I have bought a unit of the 1014D and it has come up with a problem that channel 1 does not measure DC voltage. It's funny because if it's a waveform signal it works fine.
When measuring a DC signal it makes a voltage spike and then returns to zero.
If you then touch the dough with the tip, it makes a negative peak and returns to zero again. It is as if it has a condenser effect.

Does anyone think of what the problem could be?
This only happens on channel 1. Channel 2 works perfectly.

Fungus:

--- Quote from: Crjbroker on June 01, 2021, 12:16:34 pm ---Does anyone think of what the problem could be?

--- End quote ---

You have AC coupling mode selected on that channel, it should be DC.

tunk:
Second part of learnelectronics video above, including a teardown: https://youtu.be/T_W1ozehOpg
And a Q&A session from TechCornerTV: https://youtu.be/6ACe_F2poLw

tunk:
A repair video, including close up of the front end (at 3:28)(use autogenerated English subtitles if you don't understand Portuguese):

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