The screen illumination values mentioned in paragraphs 6.2.4. to 6.2.6. and 6.3. above shall be measured by means of a photo receptor, the effective area of which shall be contained within a square of 65 mm side.
The screen illumination values mentioned in paragraphs 6.2.4. to 6.2.6. and 6.3. above shall be measured by means of a photo receptor, the effective area of which shall be contained within a square of 65 mm side.