ALTANA LCM IV - Manual (Page 78)

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Standard programs
5.7.4 Wavelength Scan mode – recording of absorbance and transmission spectrums
In the Wavelength Scan mode, the absorbance of the light in a
solution over a defined wavelength spectrum is measured. While
the scan is taking place, the cell compartment cover must be
closed. Therefore, a scan of the round cell compartment is not
possible.
The reading results can be displayed as a curve, as percentage
transmittance (%T) or as Absorbance (Abs). The collected data
can be printed as a table or a curve.
The data is available for formatting changes. These include
automatic scaling and zoom functions. Maximum and minimum
values are determined and shown as a table.
The cursor can be moved to any point on the curve for the
purpose of reading off the absorbance or transmittance value and
the wavelength. The data for each data point can also be
displayed as a table.
Table 10 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.