Hach-Lange DR 3900 User Manual - Manual (Page 106)

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Expanded programs
The Wavelength Scan is complete, if
• the graph is shown full-size,
• the scaling of the x-axis occurs automatically,
• the Cursor functions in the vertical navigation bar are
highlighted.
• a signal sounds
6.6.2.1 Navigation of the wavelength scan graph or a wavelength scan analysis
6.6.3 Work with reference scans
There are two options to work with Reference Scan:
First option:
1. Press Reference: Off in the "Options" menu to select
another scan to display on the same screen with the current
scan. Highlight the required scan number and press
Highlight reference.
Note: Once a reference scan has been selected, the Reference:
Off key in the "Options" menu turns into Reference: On.
Note: Only scans that have the same wavelength range and step
can be displayed using the overlay option. This process can be
repeated until all matching scans are displayed.
2. The reference curve is shown in orange. The absorbance or
transmittance value and the associated wavelength are
highlighted in grey.
Note: A black and an orange box are shown in the top left corner of
the display. The orange box relates to the reference scan and the
black one relates to the current wavelength scan.
Table 15 Navigating the wavelength scan
Cursor function/
Zoom function
Description
Curve Icon
(Choice of Cursor mode) Choice of Cursor mode Peak/Valley (cursor moves between minimum/maximum absorbance
values) or Cursor mode Tracking (cursor moves over each data 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.