NIEAF SMITT NI L204 Digital Light Meter User Manual

Table of Contents

Measures light from visible luminaries equipped with fluorescent, metal halide, high-pressure sodium and incandescent sources.

CAUTION
Take extreme care for the following conditions while measuring

Do not operate the meter under the environment with explosive gas (material), combustible gas (material) steam or filled with dust.
In order to avoid reading incorrect data, please replace the battery immediately when the symbol ” appears on the LCD.
In order to avoid the damage caused by contamination or static electricity, do not touch the circuit board before you take any adequate action.
Operating Environment: Indoors use. This instrument has been designed for being used in an environment of pollution degree 2.
Operation Altitude: Up to 2000M.
Operating Temperature & Humidity: -10℃ ~ 50℃, 0%~ 80%RH.
Storage Temperature & Humidity: -10℃ ~ 50℃, 0%~ 70%RH.
EMC:EN61326(1997)+A1(1998)+A2(2001)

An square area received the flux of light is known as illumination. In both United Kingdom and America the illumination’s unit is known as foot candles light, but in Europe it is known as meter candlelight.
1 foot candles light is the illumination falls on a squre area that 1 foot long vertically away from a 1 candlelight light source. It is written as 1 Fc=1 Lm/ft.
1 meter-candlelight is the illumination falls on a squre area that 1 meter long vertically away from a 1 candlelight light source. It is called Lux, i.e. a 1 square meter area receive the flux of light is called 1 lumen.
1 foo tcandle=10.764 Lux, therefore, foot (meter) candlelight =

Display	2000 count, large LCD display, easier to read.
Sensor	Silicon photodiode and filter
Measuring Range	200,2000,20000,200000 Lux
Accuracy	±3% (Calibrated to standard incandescent lamp 2856oK)

±8% (other visible light source)

Open the carrying case.
Press the “☉” button.
Remove the cover of the light sensor, Put the light sensor at the position where the testing of source of light is to be conducted, auto testing will then be conducted by the meter, read the testing value after the reading indicated becomes stable.
When “OL” is shown at the highest position at the left lateral side, overload is indicated, then please choose another range that is located at a comparatively higher position.
If you want to keep the reading value on the LCD permanently after testing, press the “D-H” Key whereby the reading value will be locked permanently up. Press the “D-H” Key once again when you want to remove the previous locking.
After testing, put the cover of the light sensor back to its former position, and turn off the switch.
After testing is completed, the indication value should be 000 no matter what its range would be after putting the cover of the light receiver back to its former position. Please adjust 0 ADJ to enable LCD to indicate 000 if zero cannot be recover. If zero still cannot be recovered, it means that the meter should be calibrated or could be defective.

Peak sensitivity wavelength:550nm

The mark set for referencing the testing of source of light is located at the right top end (0 degree) of the light sensor ball plane.
When the meter is not in use, please keep the cover of the light sensor in its place to avoid the photo diode from wearing out.
When it is not in use for a long time, please take the batteries away. And avoid keeping it in a place of high temperature and humidity.