Hach-Lange DR 3900 User Manual - Manual (Page 116)

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Expanded programs
1. Press Stray Light Check in the "Optical Checks" menu.
2. Remove any cuvettes/analysis cuvettes from the cell
compartment.
3. Place the cell adapter (A) for 10-mm rectangular cells in the
cell compartment (2).
4. Close the cell compartment cover.
5. Press Zero.
6. Insert the analysis cell into the cell compartment (2).
7. Close the cell compartment cover.
8. Press Start.
The mean value is calculated from three consecutive
absorbance measurements.
The result will be displayed.
9. Compare the result with the required value from the analysis
cell.
10. Press Cancel to return to Optical Checks.
6.8.3.5 Absorbance check
The Absorbance Check test is used to test the photometric
accuracy and repeatability of the instrument.
1. Press Absorbance Check in the "Optical Checks" menu.
2. Press λ to enter the wavelength.
3. Press OK to confirm.
4. Remove any cells from the cell compartment.
5. Close the cell compartment cover.
6. Press Zero.