Measured EV is the exposure value that the camera measured at the time of shooting. It is the value that the camera "thinks" it would give you a "correct" exposure. For example, at the time of shooting, the camera says F8, 1/125s and ISO 100 is the correct exposure (this is the measured EV), but you decide to increase the exposure to 1 stop. So you change the value to F8 1/125 ISO200 (this is the captured EV). I'm not sure about the value, maybe someone else can help you with that.
