How to calibrate the DSO Quad

Hi,

I am just about to order the DSO Quad, but, daft question guys, how can I make a regulated power supply for the required 250-300mv.

I am not an electronic wizard by any means, & I must say this part of the set up is holding me back from purchasing it.

I was just after any input on how I can set this thing up without access to any specialist power supplies etc.

Cheers, Shane