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
=
S
A
(
λ
) S
rel
(
λ
)
d
λ
S
A
(
λ
) V(
λ
)
d
λ
•
S
rel
(
λ
)
λ
0
00
ʃ
0
00
ʃ
f
′
1
=
0
00
S* (
λ
)
rel
-V(
λ
)
d
λ
V(
λ
)
d
λ
×
100(%)
ʃ
0
00
ʃ
Summary of Contents for T-10A
Page 9: ...7 Basic Operations...
Page 28: ...26...
Page 29: ...27 Advanced Operations...
Page 47: ...45 Accessories...
Page 51: ...49 Explanation...
Page 60: ...9222 A58U 11 BHJFKK Printed in Japan 2012 KONICA MINOLTA INC...
