ok. i'll try to grab my hands on such oscillospes then (rumour is : "everyone wants one", so you guys are probably right anyway ;))
here is some info i found in the documentation regarding the usb device
USB Low Layer Protocol
The integrated USB driver of the xxxxxxxxxxx device emulates a RS232 serial port.
The xxxxxxxxxxx device is processed as a Communication Device Class (CDC), in accordance with the "USB Device Class Specifications, version 2.0" available from the http://www.usb.org/ web site, in "developers, document" section.
The xxxxxxxxxxx device use the full speed transfer rate 12 Mbits/s, and is compatible with USB 1.1 and USB 2.0 Host Systems or hubs.
thanks madworm for the rule of thumb, it makes the picture much clearer now.
so if the transfer is 12Mbits/s i need about 120 "capture per second"
assuming this is the Msps unit mentioned there
then i need the USBee RX as it's the only one offering 100 Msps sampling rate. that's a 1945 USD
however, it seems the Beagle 12 made by totalphase Beagle USB 12 Protocol Analyzer - Total Phase would do the job for 475 USD
i have also seen the
You can get a Saleae Logic clone for $50, I'm talking about the Mini Logic on iTead Studio
on the other post
is it this ? ==> http://iteadstudio.com/produce/seleae-logic-usbee-ax-usb-blaster/
sorry if i sound stupid, but this is some sort of a "3 in 1" cheap chinese copy, right ? (no offense to chinese ppl)
and it seems the highest sample rate is 24 msps which not enough, so buying this would just be a waste of money
so the Beagle 12 is the best option here then, right ? anyone ever tried it ?