Measures luminance according to photopic luminous efficiency curve.
The PMA2133 is a portable luminance detector with spectral response following the CIE photopic action spectrum.  This detector is designed to have a spectral response like that of the human eye's visual response in the photopic region.

The photopic spectral luminous efficiency curve peaks at 555nm and it is normalized to 1 at that wavelength.

Luminance is the luminous intensity per unit area projected in a given direction.  The standard unit for luminance is cd/m2 (candela per square meter, sometimes referred to as nit).  Another common unit of luminance is fL (footlambert) where 1 fL = 3.426 cd/m2.  Luminance is essentially the amount of visible light leaving a point on a surface in a particular direction.  The light that leaves the surface can be due to emission, reflection, or transmission.

Features
  • High sensitivity
  • Wide dynamic range
  • Excellent long-term stability
  • Cosine corrected
  • NIST traceable calibration

 

Applications
  • Quality control of CRTs
  • Inspection of monitors

2130resp.gif (5659 bytes)

Figure 1: Photopic Efficiency and Detector Response 

Specifications

Spectral response Follows CIE photopic spectral luminous efficiency curve (400-700nm) Figure 1
Field of View 8°
Range 0 - 6,800 cd/m2 
0 - 2,000 fL
Display resolution 0.01 cd/m2 or  
0.01 fL
Operating environment 32 to 120 °F (0 to +50 °C)
Cable 5'.(1.5 m)
Diameter 1.6" (40.6 mm)
Height 3.2" (81.3 mm)
Weight 3.9 oz. (110 grams)

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