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Beware of bad power supplies
Sometimes, aftermarket power supplies, mostly for laptops, but also for LED lights, or any other power brick, can cause a lot of line noise - try individually turning off equipment to isolate the offending one.
Also, the supplied wall wart is not great at rejecting line noise - if 60Hz is a president issue, its worth trying powering the acquisition system from a high quality bench DC supply (5V) - this can significantly reduce noise in some cases.
Avoiding ground loops
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