Thanks for all your help, I will add it to my programs to keep them USB version independent.

Paul

Hi Karunen: Found the problem: USB cable!!! The scope came with blue USB cable with PICO sticker saying that it is certified for high speed (and two computer end plugs for more power). However, the computer controller (or is it the scope?) does not perceive it as USB 3.0 and reverts to USB 2.0. I us...

Hi Karunen: Thank you for posting ps4000a_x64.xls. I have tried (in 32 bit mode) on my computer and the 4824 initializes ok from what I can see. The problem appears to be that it does not return any data: the IsReady(handle) keeps returning 0 so the program remains in the while IsReady(handle) loop....

I understand that 4824 requires a set of libraries that show "a" after "PD4000" (such as ps4000a.dll). I tried to modify the excel example to include the a in libraries and functions but I get "Bad DLL calling convention". Can you post a version of excel macro working with 4824? Thanks in advance.