FAQ: How to compare readings from Aeros to D25NC. Here are the things to check when you have 2 instruments that read differently.
Answer:
1) Standardize and read the green check tile on both instruments. If they pass, then the sensors are operating correctly.
2) Check that you have selected the same color scale and illuminant/observer for both instruments. This is typically CIE Lab or Hunter Lab and D65/10 or C/2. They must match on both instruments.
3) Make sure you are presenting the samples at the correct distance from the top of the sample. Aeros will automatically move to the correct distance (82.5 mm). The D25NC can be adjusted using the vertical height adjustment arm until it reads 89 mm (+/- 10 mm) to the top of the sample. The distance is given with the reading, or you can go to DIAGNOSTICS > DISTANCE SENSOR to read the distance from the sensor to the sample being measured. Incorrectly setting the distance to the sample can affect the D25NC measurements.
4) Make sure that the samples are arranged the same way, whether poured, stacked, or crushed.
5) Check that the measurements are at the same location on the samples. This is determined by the location of the sensor over the sample. Use the horizontal arm to adjust the white spot from the center to the outside of the sample pan and set it is the same position for both. The white spot is the measurement area, and the red spot is the height measurement.
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