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ISO 3059-2012 pdf free download
ISO 3059-2012 pdf free download.Non-destructive testing Penetrant testing and magnetic particle testing Viewing conditions
Essais non destructits — Contrôles par ressuage et contróles par magnétoscopie — Moyens de verification des conditions d’observation.
Lighting conditions affect detection capability. The best conditions are when the surrounding area has some background light. Light reaching the inspector’s eyes directly or indirectly from the light source or as a result of the limited screening of other sources should be avoided.
Sources may not reach a steady state immediately and shall be allowed to stabilize before use. The light output can vary, e.g. due to ageing of the light source or deterioration of the reflector.
The test surface shall be illuminated evenly. Glare and reflections shall be avoided. NOTE Failure of a single LED within an array can cause uneven illumination.
The illuminance at the test surface shall be determined by means of an illuminance meter under working conditions. The response of the meter shall be similar to the photopic response of the human eye (as specified in IEC 60050-845).
NOTE CIE 0691’J provides further Information on evaluation of light meters.
The level of illuminance for removal of excess penetrant shall be at least 350 lx.
For inspection, the illuminance at the test surface shall be 500 Ix or greater.
In some cases, a minimum of 1 000 lx may be required.
Permanently tinted spectacles, neutral density glasses or those which darken under inspection conditions shall not be worn, except for techniques involving white background and very high levels of daylight (generally above 20 000 lx) which can reduce indication detectability. In this case, the use of neutral density glasses are permitted. Care shall be taken under such conditions.
6 Fluorescent techniques
6.1 Ultraviolet radiation
Testing shall be carried out with UV-A radiation using a source with a maximum intensity at (365 ± 5) nm and a full width at half maximum (FWHM) of 30 nm. It is important to minimize visible background light incident upon the component or light reaching the inspector’s eyes directly or indirectly from the UV-A source or as a result of the limited screening of other sources. Sources may not reach a steady state immediately and shall be allowed to stabilize before use. The UV-A irradiance can vary, e.g. due to ageing of the light source or deterioration of the reflector or filter.ISO 3059-2012 pdf free download.
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