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.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM