The steps of using the illuminance meter and the introduction of illuminance calibration
Steps for usage
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.
Illumination calibration
Calibration principle:
Let Ls irradiate the photocell vertically → E=I/r2, change r to get the photocurrent value under different illuminance, and convert the current scale into the illuminance scale according to the corresponding relationship between E and i.
Calibration method:
Using the light intensity standard lamp, under the working distance of the approximate point light source, change the distance l between the photocell and the standard lamp, record the readings of the ammeter at each distance, and calculate the illuminance E by the inverse square law of distance E=I/r2, and then calculate the illuminance E by This can get a series of photocurrent values i with different illuminance, and make the change curve of photocurrent i and illuminance E, which is the calibration curve of the illuminance meter. From this, the calibration of the illuminance meter can be done by dividing the dial of the illuminance meter.
Factors affecting the calibration curve:
Recalibration is required when the photocell and ammeter are replaced; after the illuminance meter has been used for a period of time, the illuminance meter should be recalibrated (generally 1-2 times within a year); high-precision illuminance meters can be calibrated with light intensity standard lamps; expand The calibration range of the illuminance meter can change the distance r, or choose different standard lamps, and choose a small-range galvanometer
