I've been trying to diagnose some issues using a picoscope 2405A, but keep seeing some strange intermittent signals. Attached is the data file. I've seen this same stepped signal at approximately 2MHz frequency in all my measurements, the attached data file was found when attached to a 18V wall dc power supply, however even if measuring across the ground line of the system under test I see a similar signal. The picoscope was connected to a laptop running on battery power, and I've tested with two different laptops and seen the exact same signal. Does this indicate that the picoscope is damaged? Or could it be some kind of issue with how I'm measuring? I've seen this signal on other channels on the scope as well.
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