I have 2204A PicoScope (my first PicoScope) which I'm generally happy with. However, I'm using it with a laptop (for portability) and am seeing a significant amount of noise coming the laptops AC adapter (the noise goes away if I operate on the battery). But operating strictly on battery is not very convenient, as the battery only lasts several hours (then takes several more to recharge). I would really like to use it all day. I have the option of trading up to a 4224, but was wondering if I would see the same noise issue, given that it's also powered off the USB port. Being significantly more expensive, I thought it might filter the USB power better. Any thoughts? Any other work arounds I should consider?
Thanks for any help with this.