Document ID: chunk:federal_register_of_legislation:F2024C00147:body:0:p46
Version: federal_register_of_legislation:F2024C00147
Segment Type: other
Provision Reference: 
Character Range: 160261–163202

displayed object size

       1.  Camera monitor device for indirect vision

       1.1.  General

       Determination of the displayed object size considers the possible appearance of smear. The impact on the monitors image and consequence is the occultation of the field of view and therefore of the object. The following differentiation is made:

       1.2. Case A: Smear appears

       1.2.1. Step 1: Under the condition described in paragraph 6.2.2.2.1.2. of this Regulation, measure the width (s) of the vertical bar displayed on the monitor e.g. with a measurement microscope.

       1.2.2. Step 2: Place the object at a defined distance from the camera. Measure the width of the object displayed on the monitor (b) in a situation without real sun light condition e.g. with a measurement microscope.

       1.2.3. Step 3: Calculate the residual object width () according to the following equation:

       Where:

       : residual width of the object displayed on the monitor (with smear) (minutes of arc)

       b: width of the object displayed on the monitor (without smear) (mm)

       s: width of the smear (mm)

       r: viewing distance (mm)

       1.3. Case B: Smear does not appear

       1.3.1. Step 1: Place the object at a defined distance from the camera. Measure the width of the object displayed on the monitor (b) in a situation without real sun light condition e.g. with a measurement microscope.

       1.3.2. Step 2: Calculate the object width () according to the following equation:

       Where:

       : width of the object displayed on the monitor (without smear) (minutes of arc)

       b: width of the object displayed on the monitor (without smear) (mm)

       r: viewing distance (mm)

       1.4. Data supplied by the instructions for use

       In case of Classes V and VI camera monitor devices the instructions for use shall include a table that shows the minimum and maximum mounting height of the camera above ground under consideration of different viewing distances. The camera shall be mounted within the applicable height range. The viewing distances shall be selected from the intended context of use. The following table shows an example.

Viewing distance         0.5 m         1.0 m         1.5 m         2.0 m         2.5 m

Minimum mounting height  Para. 1.4.1.  Para. 1.4.1.  Para. 1.4.1.  Para. 1.4.1.  Para. 1.4.1.

Maximum mounting height  Para. 1.4.2.  Para. 1.4.2.  Para. 1.4.2.  Para. 1.4.2.  Para. 1.2.2.

       1.4.1. The value of the minimum mounting height is the same for all viewing distances as it is independent of the viewing distance. It is determined by the dimensions of the field of vision and the field of view of the camera. Use the following working steps for determination of the minimum mounting height.

       1.4.1.1. Step 1: Draw the intended field of vision on ground.

       1.4.1.2 Step 2: Place the camera above the field of vision in