Product Code:SAE J2331 Title:Operators Field of View--Engineering Evaluation Issuing Committee:Hftc1, Controls, Visibility, Anthropometrics, Accessiblty Scope: This SAE Standard specifies a stationary test method for determining and documenting the masking effect caused by parts of the base machine with equipment as specified by the manufacturer within a visibility test circle around the eye position of a seated operator. It applies to earthmoving machinery which has a specific seated operators position. Rationale: This SAE Standard specifies a stationary test method for determining and documenting the masking effect caused by parts of the base machine with equipment as specified by the manufacturer within a visibility test circle around the eye position of a seated operator. It applies to earthmoving machinery which has a specific seated operators position.