Analyze the difference between the utility model illuminance meter and the ordinary illuminance meter
The utility model illuminance meter avoids the use of a photometric head, and the DC power supply only uses a 3V battery. The decoder, display driver and display are integrated on an integrated circuit card, which makes it simple in structure, small in size, easy to move, and has a responsive Sensitivity and other advantages. Ordinary illuminance meters 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.
Structural features of the utility model illuminance meter:
1. Accuracy Whether a lux meter is good or bad depends on its accuracy. Of course, it is also closely related to its price, so it is necessary to buy a lux meter with high accuracy at a reasonable price. Generally, the error should not exceed ±15%.
2. The types of color compensation light sources are all-encompassing. Some focus on red high-pressure lamps with longer wavelengths, or blue-purple lights with shorter wavelengths such as Daylight fluorescent lamps; there are also more evenly distributed ones such as incandescent bulb series. Sensitivity may vary slightly, so moderate compensation is necessary.
3. Cosine compensation Everyone knows that 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 between 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. In terms of volume and weight, the illuminance meter can be used in a wide range of places, and the timing of use is often in different places. Therefore, a portable illuminance meter with small size and light weight is the absolute prerequisite for the illuminance meter.
Article link: Instrument Equipment Network
