weird noise

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wy's picture
weird noise

I'm struggling to reduce all noises from patch-clamp set.but I still see wiered wave form as like below.
when I use a model-cell, this one was disappeared, so I think this are from pipette holder part or ground
So, I've changed Ag/AgCl pellet and done silver wire cloriding again but still don't see flat base line.

Would you please tell me why this happened and what should i do to get rid of it ?

Thanks in advance.