User Manual

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5.2.3. SPECTRAL RESPONSE CURVE V(l),
The light we see is electromagnetic radiation having a wavelength between 380nm and 780nm.
The response curve of the eye as a function of wavelength has been determined by the IEC (International Electrotechnical
Commission). This is the V(l) curve, or relative spectral luminous efciency curve for photopic vision (daytime vision).
Relative luminous efciency
V(l) photopic vision
lm = 555 nm
The error on the spectral response of the sensor is equal to the area of the differences between the V(l) curve and the curve of
the sensor.
5.2.4. VARIATION ACCORDING TO THE TYPE OF LIGHT SOURCE
The C.A 1110 provides 3 measurement compensations:
 Illuminant A (default).
 LED at 4000°K
 Fluorescent of type F11
The LED compensation is provided for measurements on LEDs at 4000°K. The intrinsic uncertainty in this case is 4%. If this com-
pensation is used for other LEDs, the intrinsic error is increased as indicated in the table below.
The FLUO compensation is provided for measurements on type F11 uorescent sources. The intrinsic uncertainty in this case
is 4%. If this compensation is used for other uorescent sources, the intrinsic error is increased as indicated in the table below.
Quantities of inuence Range of inuence Quantity inuenced Inuence
Type of light source
LED
3,000 to 6,000K
Illumination
The intrinsic uncertainty is increased by 3%
(for a total of 6%)
The intrinsic uncertainty is increased by 6%
(for a total of 9%)
Fluorescents of types
F1 to F12
Refer to §8.1 for the curves of the illuminants.