Yes you can, IF you have a GOOD multimeter, a cheap Harbor Freight POS isn't going to do the job. Most people don't have good accurate test equipment (and don't know the difference) unless they have been in the electronics business for many years. I still prefer a scope, I'll see not only ripple but any distortion and harmonics on the output as well. Your multimeter isn't going to show you all that. But then again, most people don't have a scope either, I guess. :(
