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Idiomas disponibles
Idiomas disponibles
KPS-LX20 • Digital light meter
(10) Prompt for relative value measurement mode
(11) (12) Prompt for max and min values inquiry
4.
MEASUREMENT METHODS
4.1 Notices prior to measurement
Do not use the light meter in environments full of dusts or having gas sub-
stances and flammable steam substances! Do not use the light meter for
measurement in the place with high temperature and high humidity. Do not
use the light meter in environments with intense infrared or ultraviolet rays.
• The opto-sensor of this meter is designed by simulating the sensitive curve
of light obtained through human eyes. The spectral coverage is between
320mm and 730mm. When it is used for measurement within the infrared
range, there will be a large data deviation.
• The opto-sensor is calibrated by common electric incandescent lamp re-
quired by CIE under the color temperature of 2854°K; the provided reading
number may be different for the spectrum of other lamps.
• The reference level of light source test is at the top of the spherical surface
illuminated.
• The optical detector should expose to light for 2 minutes before measure-
ment.
• Influence of tester's shadow and other factors on the optical detector should
be avoided.
4.2 Action principles
4.2.1 Concepts of illuminance scales
One lux (lumen) indicates the illuminance got on a surface of one square me-
ter, all points of which are one meter from a uniform source of one candela.
One foot-candle (Fc) indicates the illuminance got on a surface of one square
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