Before CMS testing, it is necessary to confirm the provided equipment information and functions. The relevant parameters are as follows:
1. Mirror Class
Specify the product mirror class (I, II, III, IV, V, VI, VII) and whether the product is for the passenger side or driver side. 2. Regulatory Area Information
For a given mirror class, the regulations specify the minimum field of view that must be covered by mirrors of that class (GB15084-2022 6.5 Field of View Requirements). The manufacturer shall define an area (Monitor defined size) that covers and displays the statutory field of view (i.e., meets the field of view test requirements). The following shall be specified for this area:
a. The position of this area on the screen, and the area must be clearly identified.
b. Width and height information.
c. The horizontal field of view and vertical field of view of the camera relative to this area (this can be measured in the laboratory once the above two items are provided).
Otherwise, the entire screen area will be used for testing.
Recorded information is as follows:
Horizontal width of the defined area Wmonitor/hor (unit: m)
Vertical height of the defined area Hmonitor/ver (unit: m)
Horizontal field of view of the camera corresponding to the defined area αmonitor/hor (unit: m)
Vertical field of view of the camera corresponding to the defined area αmonitor/ver (unit: m)

Here, the horizontal field of view αmonitor/hor refers to the angle between the leftmost and rightmost rays of the field of view projected onto the x-y plane for a camera in the reference direction; the vertical field of view αmonitor/ver refers to the angle between the topmost and bottommost rays of the field of view projected onto the x-z plane for a camera in the reference direction.

3. Eye Point Information
The distance and spatial positional relationship between the eye point and the center of the regulatory area must be provided (ISO 16505-2019:3.4.2 monitor coordinate system); otherwise, the relevant items cannot be tested. The required information is as follows:
Designed horizontal viewing angle of the monitor θmonitor/hor/D (unit: °)
Designed vertical viewing angle of the monitor θmonitor/ver/D (unit: °)
Designed distance from the human eye to the center of the monitor amonitor/D (unit: m)

Or provide the following equivalent information:
Designed viewing tilt angle of the monitor θmonitor/D (unit: °)
Designed vertical viewing angle of the monitor φmonitor/D (unit: °)
Designed distance from the human eye to the center of the monitor amonitor/D (unit: m)

Here, 1 is θmonitor/ver; 2 is θmonitor/hor.

4. Screen Display Image
The screen must be able to display the following natively:
a. A 70% gray image; otherwise, the relevant items will be tested using captured images.
b. A black-to-white (0 to 255) and white-to-black (255 to 0) switching program or animation; otherwise, the imaging time cannot be tested.

5. Screen Brightness Adjustment
Instructions for the brightness adjustment function must be provided (manual and its adjustment method, or automatic); otherwise, the contrast test will be affected.