125Expanded programs6.9.3 TimerUse this function to activate a timer at any time.1. In the toolbar, press Timer.2. Enter the required time and confirm with OK.The count-down starts automatically.3. Press Close to let the timer run in the background.Press Cancel to stop the timer.4. When the timer has finished a sound is emitted.6.9.4 AQAThe "AQA" menu contains the programs for testing the analyticalquality. For example, this controls the individual working methodwith standard solutions or the cross-sensitivities of the analysesidentified by addition solutions, multiple determinations anddilutions. For a detailed description, refer tosection 6.8.4,page 117.6.9.5 TrendsUse this function to call up a load curve of the storedmeasurement values for each parameter or sample location. Theconcentration of the corresponding parameter is showngraphically over time. For a detailed description, refer tosection 5.3.4.1, page 51.6.9.6 Link2SCLink2SC enables measurement values to be exchanged betweenon-line process probes and the DR 3900. In this way on-line datacan be verified and process probes can be corrected.The on-line data are sent to the DR 3900 in a "job file". After thelaboratory measurement values have been produced, the job fileis sent to the controller again for the corresponding probe to becorrected.
