This article mainly talks about the " calibration method of the Colorimeter ", and explains from several dimensions: why the Colorimeter needs to be calibrated, how to calibrate the Colorimeter, what are the operation steps, and what are the methods of calibrating the Colorimeter.
Why do you need to calibrate the Colorimeter?
During the use of the Colorimeter, the damage and aging of the instrument components will bring unexpected errors to the test. For a set of color difference testing equipment, the fewer movable components, the fewer problems caused by wear and component placement errors. During the test, sufficient attention should be paid to some occasional and abnormal changes in the measured value, and a careful inspection of the Colorimeter is required, because this means that a certain component of the Colorimeter may have an error, such as: Abnormal changes in the range may be due to improper calibration using the black standard plate; reflectance measurements at a certain wavelength are obviously inconsistent with reality, and there may be a problem somewhere in the monochromator. For the Colorimeter, the measurement accuracy is closely related to the spectral sensitivity of the light source and photoelectric tube. Changes in the color temperature of the light source and changes in the spectral sensitivity of the photocell will affect the measurement accuracy, and the Detector of the light source should be replaced if necessary.
Calibration of the Colorimeter is very important. It needs to be calibrated with a standard blackboard or whiteboard every time it is turned on. If it is used continuously for a long time, the number of calibrations should not be less than twice. And regularly check the instrument with the standard color plate to determine its test accuracy. The standard plate should be maintained carefully to prevent the standard parameters from being inconsistent with the measured values due to damage or pollution. For each inspection and use, especially some problems that arise, it should be recorded in the special file of the Colorimeter to facilitate future maintenance.
Therefore, we need to calibrate the Colorimeter regularly. And compare with the value of the standard plate. The regular calibration of the Colorimeter includes two aspects. One is to calibrate the Colorimeter itself regularly to ensure the accuracy of the instrument’s measured values; the other is to regularly calibrate all Colorimeters with the standard plates kept by the quality department, so as to ensure that the standards of all Colorimeters are basically uniform. Of course, you can also use a Colorimeter to measure a standard value, and other Colorimeters use this value. If conditions permit, all Colorimeters will be concentrated at the service point of the Colorimeter supplier for regular maintenance and adjustment of the difference between Colorimeters
How to calibrate the Colorimeter?
The calibration steps of the Colorimeter vary with the Colorimeter produced by different manufacturers. But it was originally called Xintong. Taking the familiar Japanese Minolta Colorimeter as an example, the general calibration steps are as follows:
Step 1: Determine the measurement environment of the surrounding space (mainly light), align the measurement hole of the Colorimeter with the air, and keep it within a certain distance without causing isolation of other objects. After the automatic calibration is completed, perform standard color calibration. As mentioned here, the Colorimeter should be calibrated in a standard measurement environment as much as possible.
Step 2: Select the standard sample, align the measuring hole of the Colorimeter in parallel with the surface of the object to be tested, be careful not to leak light, then press the test button for about 5 seconds, and the display screen of the Colorimeter will display the current L , A, B color data, store the standard color data.
Step 3: Calibration Comparison
Use the color standard color data of the standard sample to compare with the color data tested in the second step, and calibrate by comparison.
It should be pointed out that the calibration of Colorimeters is different for different brands, even different series and different production batches of the same brand, but it is certain that with the development of technology, the calibration of Colorimeters will become easier and simpler.
The above is the calibration method of the Colorimeter . I don’t know if I understand it.
