Products illuminometer (or lux meter) is a special measure luminosity, brightness instrumentation. Is to measure the light intensity (illuminance) of the extent of the object to be illuminated, i.e. the ratio of the luminous flux obtained by the object surface area to be illuminated. Illuminometer is usually caused by a selenium cell or a silicon photocell and microammeter. The product attributes multifunction illuminometer / Model of illuminometer: HAD-MS6612 31/2 digit LCD display, maximum reading of 1999 with analog bar display · range of automatic and manual switching · Data Hold / Peak measurement function, relative value measurement / zero calibration function · Maximum, minimum value query function · unit conversion function Fc / Lux Over range indication * Low battery indication · key tones mute function, automatic shutdown function · high precision, wide measuring range (0.00 to 200000Lux) · measuring spectral range : 320 ~ 730nm · Measuring range: 20/200/2000/20000/200000 Lux 20/200/2000/20000 FC · Operating Temperature: of of -10 ~~ 50 ° C, 80% relative humidity (non-condensing) · Storage temperature: -10 ~ 50 ℃, 80% relative humidity (non-condensing) (removing the battery) * Accuracy: ± 3% in accordance with the ordinary incandescent calibration in 2854K ± 6% other visible light source · cosine angle deviation characteristics of the cosine of the angle error of 30 ° ± 2% 60 ° ± 6% use ① Turn on the power. ② Open the cover of the photodetector, and the level of the photodetector on the measurement position. (3) Select the appropriate measurement stalls. If the display left end only display "1", indicating that excessive illumination, need to press the range button (⑧ keys) to adjust the measurement multiples. The ④ illuminometer work, and illuminance values ??on the display. ⑤ display data on the display constantly changes, when the display data is relatively stable, the HOLD key (⑧ key) is pressed, the lock data. ⑥ read and record observations reader. Observations equal to the the digital scale value multiplied reader. For example: is displayed on the screen 500, the lower right corner of the display state of "× 2000", the illuminance measurement value 1000000lx, i.e., (500 × 2000). ⑦ lock switch click Cancel reading lock function. ⑧ every observation, continuous readings three times and recorded. ⑨ every survey work is completed, press the power key, and cut off the power. ⑩ covered with a the photodetector lid, and put back in the box. The main uses a photovoltaic cell is a photovoltaic element that convert sunlight directly into electricity. When the light strikes the surface of the selenium cell, incident light through the metal thin film 4 reaches the boundary surface of the semiconductor selenium layer 2 and the metal thin film 4 to produce the photoelectric effect, at the interface. Generate a potential difference of the size of the photocell by a certain ratio between the illuminance on the light-receiving surface. Then if connected to the external circuit, there will be a current through, out of the current value in lux (Lx) as indicated on the scale microammeter. The optical size of the current depends on the incident light intensity and the resistance in the circuit. The luxmeter shifting device, the altimeter illumination, can also detect low light. Note ① light battery applications straight good selenium (Se) the photocell or silicon (Si) photovoltaic cell; long working can still maintain good stability and high sensitivity; selection of the high internal resistance of the photovoltaic cell when the high E, its low sensitivity good linearity, and easily damaged by strong light ② paid within V (λ) correction filter, suitable for different color temperature light source for illumination, the error is small (3) photocell plus a cosine angle compensator (opal glass or white plastic) The reason is the angle of incidence is large, the photovoltaic cell deviation cosine given then ④ illuminometer should work at or near room temperature (photocell drift change with temperature change) Others 1. visual illuminometer: inconvenient to use, the accuracy is not high, it is least 2. the photoelectric illuminometer: the composition and use of the commonly used selenium photocell illuminometer and the silicon photocell illuminometer photocell illuminometer requirements: 1. Composition: microammeter, shift knob, zero adjustment, terminal, photovoltaic cells, V ( λ) correction filter. Commonly used selenium (Se) the photocell or silicon (Si) photovoltaic cells illuminometer, also known as the lux table transaction 1, Model size determine the pay mode of transport, installation testing 4 qualified acceptance