Woo I didn't know that! Thanks!
And another question if I can, I need a new function fenerator, I don' t need of tons of settings and other things like this, my budget is 160€, what can I take? I have check an HP 3314 and it seem pretty advanced, and really good for his price (150 to 350 on ebay, there are many good deal) 20MHz is massive for me, is good for me? I have to make audio test, and to test alternate circuit, nothing for now that need arb and other thing like that.