The utility model illuminometer avoids the use of optical head, the DC power supply only needs a 3V battery, and the decoder, the display driver and the display are integrated on an integrated circuit card, which makes the structure simple, small in size, easy to move, and has a response Sensitive and other advantages. Ordinary illuminometers use photoresistors as photoelectric conversion devices, which contain a DC power supply, and are sequentially connected in series with the voltage conversion circuit, switch, photoresistor, test circuit, A/D converter, decoder, and display driver at the output end of the DC power supply. and display.
The structural characteristics of the utility model illuminometer:
1. The accuracy of the illuminance meter is related to its accuracy. Of course, it is also closely related to its price. Therefore, it is necessary to buy a high-accuracy illuminometer at a reasonable price. Generally, the error should not exceed ±15%.
2. The types of color compensation light sources are all-encompassing. Some emphasize red high-pressure lamps with longer wavelengths, or blue-violet lamps with shorter wavelengths such as Daylight fluorescent lamps; there are also more evenly distributed series such as incandescent bulbs. The same illuminance meter has different wavelengths. Sensitivity may vary slightly, so moderate compensation is necessary.
3. Cosine compensation We all know that the brightness of the illuminated surface is related to the incident angle of the light source. In the same way, when measuring with an illuminometer, the sensor (Sensor) and the incident angle of the light source will naturally affect the reading value of the illuminometer.
So whether a good illuminance meter has the function of cosine compensation cannot be ignored.
4. In terms of volume and weight, the illuminance meter has a very wide range of opportunities, and the opportunity to use it is often in different places, so portable small size and light weight are the prerequisites for the illuminance meter.
