It is advisable to place a clean and bright white paper beneath the heating grid during the Uniformity calibration process.
Please find below a case where the paper and or glass plate was found to be not clean, leading to the failure of the Uniformity calibration:
According to the Uniformity calibration report, the Parameter (Delta Wrt Parabolic Illumination) value (0.172) exceeds the maximum required value of 0.040. Additionally, upon reviewing the images provided, it is evident that there there is a dark spot on the paper or glass plate (please refer below image). Ideally, the paper should be clear & bright white, and placed beneath the heating grid.
Note: If after using a clean piece of white paper and cleaning the glass plate the problem is not solved, the camera might be dirty (dust particle). Please ask a dsm-firmenich representative for help.