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NI-210SU, China VI curve tracer with LCD-screen, noisy input B

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eev_fan:
Bought this tracer from AliExpress.
As seen in the videos below channel B is noisy, both open and shorted to ground.
Are they all like this?

https://youtu.be/YOFYb0VQqDU
https://youtu.be/wewnjm7-cPg

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