8. Prompt for low battery
9. Prompt for relative value measurement mode
10. Prompt for max and min values inquiry
11. Select light source.
12. Light source code.
2 Measurement methods
Notices prior to measurement
Warning
1: Do not use the light meter in environments full of dusts or
having gas substances and flammable steam substances!
2: Do not use the light meter for measurement in the place
with high temperature and high humidity.
3: Do not use the light meter in environments with intense infrared or
ultraviolet rays!
Tips
1: 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.
2: The opto-sensor is calibrated by common electric incandescent lamp
required by CIE under the color temperature of 2854°K; the provided
reading number may be different for the spectrum of other lamps.
3: The reference level of light source test is at the top of the spherical
surface illuminated.
4: The optical detector should be exposed to light for 2 minutes before
measurement.
5: Influence of tester's shadow and other factors on the optical detector
should be avoided.
Action principles
Concepts of illuminance scales
One lux indicates the illuminance from a surface of one square meter,
all points of which are one meter from a uniform source of one candela.
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