ALTANA LCS III - Manual (Page 44)

43
Standard Operations
The .
ΔL*,.Δa*and .Δb* values are the numerical differences
between the L*,a* and b* values of the sample and those of the
displayed PHARMA color solution. The measurements can be
carried out with cuvettes/sample cells with path lengths of
10 mm,11 mm or 50 mm. The CIE L*a*b*values depend on the path
length and are always related to the type of cuvette/sample cell
employed. The longer the path length, the better the measuring
accuracy.
1. Press Pharm.Eur. Color No.
2. Insert the sample cuvette/cell.
3. The result of the color calculation is displayed.
4. Press Auto BY3 (touch-sensitive area 8).
5. Select Auto.
6. Press Graph.
The additional color matching result of the Pharm. Eur. Color is
displayed.
The upper value shows the actual option for the color matching
calculation which can be Auto for matching in all 5 Pharm. Eur.
Scales or B, BY, Y, GY or R for matching only inside of the selected
color scale.
The lower entry shows the result of the color matching, e.g.
brownish-yellow 3 (BY3) in this example.
The
ΔLab* - values shows the color difference of the measured
sample in relation to the Pharm. Eur. Color No. BY3.
The
ΔE* - value shows the three dimensional color difference of the
measured sample in relation to the Pharm. Eur. Color No. BY3.
7. Press Return to change the option for the color matching
function.
8. Select Scale is displayed.
9. The option for color matching to a special scale can be
changed.