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USB noise in 2204A

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USB noise in 2204A

Postby pkelecy » Mon Jan 12, 2015 4:16 pm

Hi,

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.
Pat
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Re: USB noise in 2204A

Postby Hitesh » Mon Jan 19, 2015 3:11 pm

Hi Pat,

Are you capturing signals from another piece of equipment that is also connected to an electrical power supply?

There may be a grounding issue.

Regards,
Hitesh

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