External Power

I am probably not looking hard enough, but I cannot find any discussion of using M2K with external power. I did some experiments over the weekend that required more power than M2K could produce when only powered from my computer USB. The voltages produced by the signal generator were not as high as I specified and Scopy crashed a few times. When I redesigned my circuit to require less power, everything worked fine. I have now added a wall wart for additional power, but I cannot find any discussion of additional capabilities that this might enable. Can anyone point me in the right direction? Thanks.