What does the lux meter's verification entail?
The random measurement errors in the verification process of the illuminance meter mainly include external light interference, changes in temperature and humidity, voltage fluctuations of the regulated DC power supply, vibration during the movement of the standard lamp, and personnel readings.
Some of these random measurement errors are unavoidable, and measures need to be taken to minimize the impact of the errors.
The illuminometer verification environment should be in a dark room with constant temperature and humidity to reduce the influence of external light, temperature and humidity. The illuminometer should be installed on a stable workbench (there should be no strong magnetic field around it to prevent electromagnetic interference);
The indoor temperature should be kept at (20±5)°C (photocell drift changes with temperature).
The room should be dry and the humidity should be less than 85%RH. Because the humidity is also affected by the contrast meter;
For this reason, the light probe of the illuminance meter is required to have better sealing performance, and the illuminance meter that has not been used for a long time should be powered on once at a certain interval.
In order to reduce the impact of vibration caused by the movement of the standard lamp, the light track and the trolley are selected, and slide slowly during the measurement process to reduce the impact of vibration.
As for the problem of personnel reading, it is necessary for the verification personnel to have considerable knowledge of illuminance meter verification and skilled operation skills, and be responsible in the process of lux meter verification.
The specific operation steps of the illuminance meter, the illuminance meter (or called lux meter) is a kind of instrument and meter specially measuring luminosity and brightness.
It is to measure the light intensity (illuminance) is the degree to which the object is illuminated, that is, the ratio of the luminous flux obtained on the surface of the object to the illuminated area.
An illuminance meter is usually composed of a selenium photocell or a silicon photocell and a microammeter.
So, what are the specific operation steps of the illuminance meter? Now for everyone to explain in detail:
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.
