Konica Minolta T-10A - DIN Cosine Correction Analysis

53
[Conforms to DIN]
Ideally, the relative spectral responsivity of the illuminance meter should match V (λ)
the spectral luminous efficiency of the human eye for photopic vision.
As shown in the graph above, the relative spectral responsivity of Konica Minolta Illuminance
Meters T-10A/T-10MA is within 6% (f’1) of the DIN spectral luminous efficiency V (λ).
Class L A B C
f’
1 (%) 1.5 3 6 9
DIN ; Deutsche Industrie Normen
f’1 (DIN’s symbol) ; The degree to which the relative spectral responsivity matches
V (λ) is characterized by means of the error f’
1.
Note : The contant has the dimension nm
-1
S
*
rel
(λ) Normalized relative spectral responsivity
S
A
(λ) Spectral distribution of the illuminant used in the calibration
S
rel
(λ) Relative spectral responsivity with arbitrary reference
V(λ) Spectral luminous efficiency of the human eye for photopic vision
S* ( )rel =
SA(λ)Srel(λ)dλ
S
A(λ)V(λ)dλ

• Srel(λ)
λ
0
00
ʃ
0
00
ʃ
f′1 =
0
00
S* (λ)rel -V(λ) dλ
V(λ) dλ
×100(%)
ʃ
0
00
ʃ