Hach-Lange DR 3900 User Manual - Manual (Page 110)

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Expanded programs
• Select Mark to mark the next data point collected. This mark
is not used by the instrument, but is available for the user and
may indicate a significant event, such as the addition of a
sample or other reagent. The mark is also shown in the table.
• Select Stop to stop taking sample readings.
6.7.3 Analysis of time course data
After the Time Course data has been collected, the following
manipulations can be done on the graphic data:
The Time Course Program is complete, if
• the instruments beeps after completion of the overall time
• the graph is shown full-size,
• the scaling of the x-axis occurs automatically,
• the Cursor functions in the vertical navigation bar are
highlighted.
6.7.3.1 Navigation of a time scan or a time scan analysis
After a time scan has been completed, the time and the
absorbance/transmittance data is displayed as a curve.
Where the cursor is positioned on the curve, the elapsed time up
to this point and the corresponding absorbance are highlighted.
Table 17 Navigating the time scan
Cursor function/
Zoom function
Description
Curve Icon
(Choice of Cursor Mode)
Delta mode: A second cursor is highlighted. The position of the fixed cursor was previously
defined in Cursor mode Single. Use the active cursor to select any point on the reading curve.
The difference to the fixed cursor is shown on the curve. The delta values are correspondingly
highlighted and displayed on the x and y axes.
The gradient of the curve and the correlation coefficient (r
2 ) between the cursor points in the
Delta mode are shown under the curve.
Cursor mode, single: The cursor moves to each selected measuring point of the scan.
Arrow keys
The arrow keys (right/left) are used to move the cursor (depending on the selected mode) to the
next data point. The data of the data point (wavelength, absorbance or transmittance value) are
highlighted on the x and y axes.
Note: Press any point on the curve to display the associated data.
Zoom Icon
This function is used to magnify the section of the curve in the vicinity of the cursor. The original
curve size can be restored by pressing the zoom icon again.