Understanding Inter-Instrument Agreement

These Datacolor customers have benefited from an excellent inter-instrument agreement to improve their color processes. While the setting up of spherical spectrophotometers is basically the same for all instruments, small differences have a significant effect. Each modern ball instrument consists of a lamp that illuminates a ball dressed in white. This in turn illuminates a sample with diffuse light and a holographic grid that separates the light reflected by the sample into its spectral components, which are then processed and analyzed by a sensor. Nevertheless, we have done a lot of work to reach as close an intermodal agreement as possible between our aircraft. Our Ci6x and SP instruments are good examples. Although they are different instruments, they have a fairly narrow intermodal agreement. The two measurement principles ensure the alignment of the instruments, which can be achieved between two different instrument structures, because not only are they calibrated to the same standard, but they also eliminate errors caused by misrepresentation of samples, minimizing differences. The agreement between the instruments is the close-up reading of two or more spectrophotometers of a similar model of the same color. The closer the AI is to your fleet of instruments, the closer its readings will get. While IIA is less important if you only do one spectrophotometer in one place, it is important that you need your instruments to communicate throughout the supply chain. The closer the AI is, the more likely your colors are to be consistent across all products, materials or locations. Spectrophotometers are calibrated by default with the spectral refrivation of a white calibration tile.

To ensure reliable performance, the spectral reflection of the white calibration tiles is important. Each manufacturer must comply with international calibration standards, but the accuracy of the instrument itself and the inter-instrument agreement (comparing two or more units of the same model) depend directly on the accuracy of the calibration method. Only a few selected instrument models, now available worldwide, provide these exceptional results, without the need for adjustments based on instrument profiling. The Datacolor 800 family of spectrophotometers meets the requirements of a true close-tolerance instrument with excellent performance and an inter-instrument chord outside the box. Not if you take the right steps. Spectrophotometers need regular calibration and service to ensure their performance and accuracy, as well as their long-term repeatability.

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