PMA 2133 Luminance Probe

The PMA2133 measures luminance according to photopic luminous efficiency curve.

U.S.Pat.5,946,641

U.S.Pat.5,790,432

Features:

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

> Detectors need to be used with a Radiometer

> Analog version of this detector can be used with any 0 to 5 VDC or 4 to 20mA recording device

Applications:

Quality control of CRTs
Inspection of monitors

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.

Figure 1: Photopic Efficiency and Detector Response

Specifications:

Spectral response Follows CIE photopic spectral luminous
efficiency curve (400-700nm) Figure 1
Field of View 13°
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)
Viewing Diameter 0.45" (11.4 mm)
Diameter 1.6" (40.6 mm)
Height 3.2" (81.3 mm)
Weight 3.9 oz. (110 grams)

> Return to Detector Selection Guide