9: Non-destructive Examination

Keywords:
• eye within 6 in. – 24 in. (150 mm – 600 mm)
• angle not less than 30 degrees
• Visual aid instruments have a resolution at least equivalent to that which is
attained by direct visual examination.
• the illumination should be sufficient to allow resolution of fine detail.
• These illumination requirements are to be addressed in a written
procedure.
Hint: No specific requirement on the amount of illuminances in Lux/ Foot
Candle.