The interval recording feature was discontinued on the "B" model, so there's no way to do it in camera. That being said, there's still many ways to achieve a stop motion...
I know some editing programs will let you capture using a "stop motion" effect. What NLE are you using?
I use DV Rack with my DVXs for most of my shooting. As of 2.0 it has both stop frame animation mode, complete with onion skin view, plus time lapse mode with any interval your heart desires.
It's a great site on all things animation, especially for the DIY'er.
Also, they have a great page on various software options for capturing to a computer (which you're going to have to do with your DVX, or any other camera if you want to do a decent job):
If you mean stop motion for animation then whenever I've done it I've just let the camera run, move the figures slightly, take my hands out of frame for a brief moment, and so on and so on.
just as long as you get one frame for each frame that you need then you're fine and you can extract those frames you need from a video that has hands here and there sometimes or whatever
this can take a while though, extracting all the frames for my lego film was very long and borring, but i didn't have time to work out a better way, even though that may sound silly
if i were to do it again i would try out using the still feature you get on most cams, if you've got a whole load of stills and they're in order then you can make video out of them in QT pro, i think there is a way to do it in FCP but i haven't quite figured it out yet
just play around doing different things and work out what works best for you
btw, why the hell did they take the time lapse feature off the dvx100b!? GRRRRR!!!