Hach DR 5000, User Manual

Page: 99 / 136

99
Advanced Operations
6.6.3 Work with reference scans
There are two options to work with Reference Scan :
Option 1:
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: After selecting a reference scan 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. A reference curve can only be
displayed with another active curve. Two previously stored scans
cannot be overlaid.
2. The reference curve is shown in gray. The absorbance or
transmittance value and the associated wavelength are
highlighted in gray.
Note: A black and an gray box are shown in the left corner of the
display. The gray box relates to the reference scan and the black one
relates to the current wavelength scan.
3. To complete the wavelength scan reading, see section 6.6.2 on
page 97 .
• The newly plotted wavelength scan curves are shown in
black.
• The absorbance or transmittance value and the associated
wavelength are highlighted in black.
• In addition, the display shows the difference between the
wavelength scan curve and the reference curve against the
wavelength.
4. Press the black or gray small box in the left upper corner on the
screen to switch between the actual wavelength scan and
reference scan.