GB/T 20968-2007 (English Version) PDF

Standard No.: GB/T 20968-2007
Language: Chinese, Available in English version
Release Date: 2007
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 20968-2007

Scope: 1.1 This standard specifies the characteristics of the following types of low power magnifiers and recommends their selection for surface inspection. - Monocle mirror magnifying glass, typical magnification up to 4 times (Type A). —Multi-lens magnifying glass with a typical magnification of 10 times (type B). - dual-system magnifiers, typically with a magnification of 15 times (type C), of the following two types: a) binoculars, usually with a long working distance (type C.1); b) binoculars, equipped with narrow Adjustment or other accessories for stereo viewing (Type C.2). - Concave lens magnifying glass with front surface mirror, typical magnification up to 6 times (type D). 1.2 This standard does not deal with: - small magnifying glasses and spectacles that the watchmaker puts on the eye sockets; - monocle magnifying glasses, spherical or cylindrical lens magnifying glasses (including magnifying glasses with useful magnifying glass for various graduated scales used for measurement); - liquid-filled, plastic lens capsule; - magnifying glass for internal surface inspection.

GB/T 20968-2007 history

2007 GB/T 20968-2007 Non-destructive testing.Aids to visual inspection.Selection of low-power magnifiers