Not sure where you can find a standard one, but my bet is 90% is boilerplate stuff. If you don't mind, what doesn't feel right? Did you make him explain each paragraph and reasons for it, and answer questions for you? I use attorney's quite a bit and really push them onto the hot seat, I learned early on they were quick to try and control my meetings with them which is just unacceptable to me.
I did find this with some examples:
http://www.startupcompanylawyer.com/category/convertible-not...
and this:
http://www.docracy.com/2740/convertible-note-term-sheet-temp...
Obviously I am not an attorney and I don't have any convertible notes so I can't answer from first hand knowledge but hopefully those help some.