The use steps and precautions of the illuminance meter
Luxmeter usage requirements
1. Photocells should use selenium (Se) photocells or silicon (Si) photocells with good linearity; they can still maintain good stability and high sensitivity after working for a long time; when E is high, photocells with high internal resistance are used, and their sensitivity is low and linear Well, it is not easily damaged by strong light.
2. There is a V (λ) correction filter inside, which is suitable for the illumination of light sources with different color temperatures, and the error is small.
3. Add a cosine angle compensator (opalescent glass or white plastic) in front of the photocell because the photocell deviates from the cosine rule when the incident angle is large.
4. The illuminance meter should work at or near room temperature (photocell drift changes with temperature).
Steps to use the illuminance meter
①Turn on the power.
②Open the cover of the photodetector and place the photodetector horizontally at the measuring position.
③Select the appropriate measurement gear.
If only "1" is displayed at the left end of the display, it means that the illumination is too much, and you need to press the range key (⑧ key) to adjust the measurement multiple.
④The illuminance meter starts to work and displays the illuminance value on the display.
⑤ The data displayed on the display screen is constantly changing. When the displayed data is relatively stable, press the HOLD key to lock the data.
⑥Read and record the observed value displayed in the reader. The observed value is equal to the product of the number displayed on the readout and the span value.
For example: 500 is displayed on the screen, the status displayed in the lower right corner is "×2000", and the illuminance measurement value is 1000000lx, that is (500×2000).
⑦Press the lock switch again to cancel the reading lock function.
⑧ For each observation, take three consecutive readings and record them.
⑨ After each measurement is completed, press the power switch key to cut off the power.
⑩Close the photodetector cover and put it back into the box.
Precautions for use of illuminance meter
① It is necessary to check whether the battery and the qualified label are within the validity period.
②The light receiver of the illuminance meter must be clean and dust-free.
③Cover and check the zero point.
④ The measurement starts 5 minutes after the incandescent lamp is turned on, and the measurement starts 30 minutes after the gas discharge lamp is turned on. The unit of illuminance is lux
⑤ After each operation is completed, fill in the record sheet and put away the instrument.
