BS 7522-1:1992
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Low vision aids Specification for hand and stand magnifiers, including magnifiers with an integral source of illumination
Hardcopy
15-11-2000
English
28-02-1992
Committees responsible
Foreword
Specification
1. Scope
2. Definitions
3. Classification
4. Testing requirements
5. Optical characteristics
6. Mechanical characteristics
7. Electrical characteristics
8. Ignitability resistance
9. Marking, packaging and instructions for use
Appendices
A. Derivation of trade magnification
B. Recommendations regarding subjective
characteristics of hand and stand magnifiers
C. Determination of equivalent power
D. Determination of distortion
E. Determination of diffusion
F. Determination of transmittance
G. Impact resistance test
H. Determination of ignitability (heated rod test)
Table
1. Permissible levels of distortion
Figures
1. Derivation of trade magnification
2. Recommended system for visually inspecting for
defects
3. Distortion assessment charts
4. Arrangement for the determination of distortion
5. Diffusion angles
6. Arrangement of apparatus for measurement of
diffusion
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