That's the Saleae Logic, I've got one and they are great, no analog though.
Correct, but the original question was for a logic analyzer to monitor USB data exchanges so the Saleae logic would be his cheapest option.
as long as it gets the job done quickly without days of scratching my head not understanding what is going on
==> i guess that's enough.
once i'm used to logic analysis then i will know what i need / want / dont want ==> then i may target something more professional.
for now "cheap that works" is exactly what i am looking for.
so will Saleae be able to understand/capture/decode raw usb frames ? (it is digital signal indeed, sorry if i wasn't clear on that)
Important: i have never read the hundreds pages long of official low level USB norm/protocol definition (what i will call here the "transport protocol"). However i am expert with the targeted peripheral "application-level protocol" i want to see on the device under test while it is operating.