Analyze the differences between utility model illuminance meters and ordinary illuminance meters
The utility model illuminance meter avoids the use of a photometric head, and only uses a 3V battery for DC power supply. The decoder, display driver and display are integrated on an integrated circuit card, making it simple in structure, small in size, easy to move, and responsive. Sensitivity and other advantages. Ordinary illuminance meters use photoresistor as a photoelectric conversion device, which contains a DC power supply, a voltage conversion circuit, a switch, a photoresistor, a test circuit, an A/D converter, a decoder, and a display driver that are connected in series to the output end of the DC power supply. and monitor.
Structural features of the utility model illuminance meter:
1. Accuracy Whether a light meter is good or bad is related to its accuracy. Of course, it is also closely related to its price. Therefore, it is necessary to buy a high-accuracy illuminance meter at a reasonable price. Generally, it is appropriate to have an error of no more than ±15%.
2. The types of color compensation light sources are all-encompassing. Some focus on red high-pressure lamps with longer wavelengths, or blue-violet lamps with shorter wavelengths such as Daylight fluorescent lamps. There are also evenly distributed ones such as incandescent light bulbs. The same illuminance meter measures different wavelengths. Sensitivity may vary slightly, so appropriate compensation is necessary.
3. Cosine compensation As we all know, the brightness of the illuminated surface is related to the incident angle of the light source. In the same way, when measuring with a light meter, the incident angle of the sensor (Sensor) and the light source will naturally affect the reading value of the light meter.
Therefore, whether a good illuminance meter has the function of cosine compensation cannot be ignored.
4. Volume and weight: Illuminance meters are widely used and often used in different places. Therefore, the most important prerequisite for a portable illumination meter is small size and light weight.
