What is the calibration of the illuminance meter like?
Random measurement errors during the calibration 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, which requires measures to reduce the impact of the errors as much as possible.
The calibration environment of the illuminance meter should be in a dark room with constant temperature and humidity to reduce the influence of external light, temperature and humidity. The illuminance meter 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 maintained at (20±5)℃ (photocell drift changes with temperature changes).
The room should be dry and the humidity should be less than 85%RH. Since humidity also affects the light meter;
For this reason, the light probe of the illuminance meter is required to have good sealing performance. If the illuminance meter is not used for a long time, it is best to be powered on at intervals.
In order to reduce the impact of vibration caused by the movement of the standard lamp, a light track and a trolley are selected, and they slide slowly during the measurement process to reduce the impact of vibration.
As for the issue of personnel readings, the calibration personnel need to have considerable knowledge and proficient operating skills in illuminance meter calibration, and be serious and responsible during the illuminance meter calibration process.
Specific operating steps of an illuminometer. An illuminometer (or lux meter) is an instrument that specializes in measuring photometry and brightness.
It measures the light intensity (illuminance), which is the degree to which an 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 usually consists of a selenium photovoltaic cell or a silicon photovoltaic cell and a microammeter.
