Step by step introduction to the use of illuminance meters
① Turn on the power.
② Open the light detector cover and place the light detector horizontally in the measurement position.
③Select the appropriate measuring gear.
If only "1" is shown on the left end of the display, it means that the illuminance is too much and you need to press the range key (⑧ key) to adjust the measurement multiplier.
④ The illuminance meter starts working and shows the illuminance value on the display.
⑤ The data shown on the display changes constantly, when the display data is more stable, press the HOLD key to lock the data.
⑥ Read and record the observed value shown in the readout. The observed value is equal to the product of the number displayed in the readout and the range value.
For example: 500 is displayed on the screen, the lower right corner of the display status is "×2000", the illuminance measurement value is 1,000,000lx, i.e. (500 × 2000).
⑦ Press the lock switch again to cancel the reading value lock function.
⑧ Each observation, three consecutive readings and record.
⑨ After each measurement is completed, press the power switch button to cut off the power supply.
⑩Cover the lid of the light detector and put it back in the box.
Illuminance meter precautions
1, the photocell application of good linearity of selenium (Se) photocells or silicon (Si) photocells; long time work can still maintain good stability, and high sensitivity; high E when the choice of high internal resistance photocells, its low sensitivity and good linearity, by the bright light is not easy to damage.
2, paid within the V (λ) correction filter, suitable for different color temperature light source illuminance, error is small.
3, the photocell before adding a cosine angle compensator (opal glass or white plastic) because the incident angle is large, the photocell deviates from the cosine rule.
4, the illuminance meter should work at room temperature or near room temperature (photocell drift with the temperature change and change.
