70Standard programs.Timer 1, Timer 2, Timer 3 and Timer 4:The timers are activated or deactivated with the control boxes onthe left of the display. In the next column, a selection can bemade from a list of names that describe the corresponding workstep. In the third column, the times for each active timer areentered.3. When finished programming, press Store and then Cancelto return to the "User Programs" menu.4. Press Start to begin the test with the new data.5.5.5.3 Manual check/revision of test dataIf an incorrect entry was made during the data update and is notrecognized via the barcode of the cuvette/sample cell (e. g. anincorrect measuring range), another option is available forchecking and if necessary revising, the test data.1. Insert the light shield in cell compartment #2.The instrument needs to be at the "Main Menu". Alternatively,selectBarcode Programs in the Main Menu.2. Insert the zero cell or sample cell (corresponding to theprocess specification) into cell compartment (1).3. Press Options>More>Edit.A data overview is displayed, with the specifications of thetest that is to be revised.4. Compare the displayed data with the data in the processspecification and edit the displayed data in accordance withthe process specification.5.5.5.4 Update via the InternetUpdate via USB memory stickTo obtain the software for the update from the Internet atwww.hach-lange.com:1. Go to http://www.hach-lange.com.2. Select the country and go to Download>Software.3. Enter DR 3900 in "Search for documents".4. Navigate to the corresponding file for download.5. Open the ZIP file and save the files to the USB storagedevice or PC. The files must be unpacked before they aresaved on the USB storage device or PC.6. Press Instrument Update in the "System Check" menu.
