Hach-Lange DR 3900 User Manual - Manual (Page 117)

117
Expanded programs
7. Place the analysis cell in the cell compartment.
8. Close the cell compartment cover.
9. Press Read.
10. Remove the analysis cell.
11. Close the cell compartment cover.
12. Press Zero.
13. Place the analysis cell in the cell compartment.
14. Close the cell compartment cover.
15. Press Read.
16. Repeat this procedure until 5 comparison measurements
have been obtained.
The result will be displayed.
17. Compare the result with the analysis cell required values.
18. Press Cancel to return to Optical Checks.
6.8.4 AQA - Analytical Quality Assurance
1. Press AQA in the System Checks menu to configure AQA
measurement or AQA in the toolbar to the right of the
display, to carry out AQA measurement.
The AQA menu in System Checks contains the program for
checking the analytical quality. Configuration is done here,
for example the individual working method being controlled by
standard solutions or the cross-sensitivities of the analyses
identified by standard additon solutions, multiple determinations
and dilutions.
As optional accessories for full individual control, standard and
top-up solutions are available (
Section 9, page 137 ).