7
LIGHT MEASUREMENT
1) Set the function switch to the desired “Lux” or “x10 Lux” range.
2) Remove the meter and face the photo detector to the light source in a
horizontal position.
3) Read the illuminance nominal from the LCD display.
4) Over-range: If the instrument displays “1” in the M.S.D. the input
signal is too strong, and a higher range should be selected.
5) When the measurement is completed, turn the function switch to the
OFF position and remove it from the light source.
6) Spectral sensitivity characteristic: To the detector, the applied photo
diode with filters makes the spectral sensitivity characteristic almost
meet C.I.E (International Commission on Illumination) photopia curve
V () as the following chart describes.
6 in 1 Digital Multimeter User Manual
14
100%(Relative Sensitivity) Spectral Sensitivity
Wavelength(nm)
•Recommended Illumination:
Locations
Office
*
Conference, Reception room.
Clerical work
Typing drafting
Factory
*
Packing work, Entrance passage
Visual work at production line
Inspection work
Electronic parts assembly line
Hotel
*
Public room, Cloakroom
Reception, Cashier
Store
*
Indoors Stairs Corridor
Show window, Packing table
Forefront of show window
Hospital
*
Sickroom, Warehouse
Medical Examination room
Operating room
Emergency Treatment
School
*
Auditorium, Indoor Gymnasium
Class room
Laboratory Library Drafting room
80%
60%
40%
20%
0
V(
λ
)
400 500 600 700
Lux
200 to 750
700 to 1,500
1000 to 2,000
150 to 300
300 to 750
750 to 1,500
1500 to 3,000
100 to 200
200 to 1,000
150 to 200
750 to 1,500
1500 to 3,000
100 to 200
300 to 750
750 to 1,500
100 to 300
200 to 750
500 to 1,500
