Hach-Lange DR 3900 User Manual - Manual (Page 113)

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Expanded programs
5. Press Verification.
6. Insert cell adapter A ( Figure 3, page 19 ) in cell compartment
(2).
7. Remove any remaining cells from the cell compartment.
8. Close the cell compartment cover.
9. Press Start.
10. Follow the directions on the display and set various filters
one after another in the order displayed.
11. Press Next after inserting a filter.
After the last reading the results are displayed.
12. Press PC & Printer icon to send the data to a USB memory
stick, PC or to a printer.
The files will be stored automatically as CSV files (Comma
Separated Value). The file name will be formatted as
"Verification.csv".
6.8.3.2 Test solution
The test solution (refer to Section 9, page 137 ) serves as a
regular quality control for the photometric accuracy of or the
relevant spectral photometer.
When results exceed allowable tolerances (given in the quality
control certificate to the test record), contact the manufacturer.