People's needs/wants are different. Personally, I'll forego the analog scope because, overall, I like digital scopes better for my needs. If I really need one I'll get out the Phillips scope I bought in the 70's.I don't know why people don't buy an old analog oscilloscope.
Most I2C I use is 400kHz, which would round the corners off a lot; you wouldn't be able to see potential rise time issues (the scope would be creating its own, you might think you have a problem that isn't there.)I'm only really starting out so this will do me just fine. I like the hackability of the tool as well as the fact that source code and schematics are available. If there's a simple bug I can fix it myself without having to resort to posting it off.
Also, why couldn't I analyse I2C? Its data rate is only in the 100s of kbps. Sure, the corners might be rounded but I'd certainly see the fundamental frequencies with 1MHz
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