JJF 1292-2024Program of Pattern Evaluation of Focimeters (English PDF)

National Standard of the People's Republic of China

Classification

A 55

Issued by: State Administration for Market Regulation

Contents

• 1 Scope(1)
• 2 References(1)
• 3 Overview(1)
• 3.1 Purpose(1)
• 3.2 Measurement principle (1)
• 4 Legal management requirements (1)
• 4.1 Requirements for measurement units (1)
• 4.2 Logo(1)
• 5 Measurement requirements (2)
• 5.1 Zero indication error (2)
• 5.2 Spherical power indication error (2)
• 5.3 Cylindrical power indication error (2)
• 5.4 Nonlinear error (2)
• 5.5 Prism indication error (2)
• 5.6 Center error (3)
• 5.7 Axis marking deviation (3)
• 5.8 Deviation of lens optical center mark (3)
• 5.9 Parallelism deviation of adjustable baffle (3)
• 6 General technical requirements (3)
• 6.1 Appearance(3)
• 6.2 Mechanical structure (3)
• 6.3 Measuring range(4)
• 6.4 Printing Marks(4)
• 6.5 Parallax(4)
• 6.6 Support structure (4)
• 6.7 Climate and environmental adaptability (4)
• 6.8 Power supply environment adaptability (5)
• 7 Type Evaluation Items Table (5)