Tektronix J1806 Radiance Light Measurement Head

Tektronix J1806 Radiance Light Measurement Head
Manufacturer: Tektronix
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Tektronix J1806 Radiance Light Measurement Head

 

Tektronix J1806 Radiance Light Measurement Head

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 For the Tektronix J17 Series Light Meters

   The Tektronix J1806 Radiance Head is designed for quickly verifying or resetting the color balance of a display. The display should first be color characterized using either a J17 with a J1820 chromaticity color head,  or using a J18 with a J1810 chromaticity head. The J1806 has a flat spectral response 8% from 450 nm to 750 nm due to its stable multi-element laminated glass photopic filters. Readings taken are measured in watts/meter /steradian. Readings taken are measured in watts/meter /steradian.

   For surface radiance and display measurements, the J1806 field of view must be completely and uniformly filled. The J1806 has an acceptance angle (or cone of acceptance) of approximately eight degrees. This corresponds to a 1.7-inch (4.3 cm) diameter circle at a distance of one foot from the sensor. The diameter measured is proportionally greater as distance increases; for example it is approximately 17 inches at 10 feet (43 cm at 3 m) from the sensor.

   As long as the entire acceptance angle is uniformly filled by the light source, the sensor-to-surface distance is not critical, and the reading source will be the same regardless of distance. The area viewed increases proportionally with the square of the distance, thus compensating exactly for the decrease of light that occurs proportionally with the square of the distance. The minimum viewing diameter of the J1806, using the suction cup in contact with the surface to be measured, is approximately 0.5 inches (1.27 cm). 0.5 inches (1.27 cm).

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