Here - PMOD/WRC

Current in Photometer / A
3,675E-07
3,670E-07
Estability of the Luminance Standard
feeding by a stabilized DC source
The light emitted
by the surface of the
standard is not polarised.
3,665E-07
3,660E-07
A FOTI standard
photometer was used in a
photometric
3,655E-07
bank to
calibrate the luminance of
3,650E-07
0 100 200 300 400 500 600 700 800 the surface of the standard
Time (min)
in cd m -2 , measuring the
Fig. 2.- Time Stability of the Luminance Standard.
illuminance on the
Measured with the Photometer FOTI along 12
hours
photometer produced by
the luminous surface at
different distances. The FOTI photometer was previously calibrated against standard
luminous intensity lamps.
The luminance of the luminous surface of the luminance standard was measured
with a final expanded uncertainly (k=2) of ± 0.7%.
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