Waters 2489, Overview And Maintenance Manual

Page: 87 / 150

June 11, 2015, 715004752 Rev. A
Page 87
Figure 3–32: Storage slot number box
3. In the slot number box, enter a number from 1 to 3.
4. Press Enter to store the last sample scan, paired with its zero scan.
To obtain information about a stored spectrum:
1. Press SCAN (Shift Chart-mark) to view the Scan choice list.
2. Press 3, Get scan info.
Result:
A slot number box appears with a default of “Last” (the most recently
stored spectrum).
3. Press Enter to get information about the last stored spectrum, or type the
number (1 to 3) of the stored spectrum for which you want information, and
then press Enter.
Result:
A screen containing the following information appears:
• Storage slot number of the selected scan (or “Last scan”)
• λ range – Displays the wavelength range for the selected spectrum
• Pace – Displays the pace for the selected spectrum
4. Press Enter to exit the information screen and return to the Scan choice list.
3.3.4 Reviewing a stored spectrum
Once you store a spectrum, you can retrieve it for review from one of the three
available storage slots by selecting the Review option from the Scan choice list.
To review a spectrum:
1. Press SCAN (Shift Chart-mark) to view the Scan choice list.
2. Press 4, Review.
Tip:
When you select Review, you actually are retrieving the zero scan and the
sample scan that were stored as a pair.
3. Enter the storage slot number (1 to 3) of the spectrum you want to review.
4. Press Enter. The message “Retrieving spectrum
n ” appears.
Once you retrieve a spectrum for review, you can view it graphically and adjust the
wavelength and AU ranges, if necessary. You can also run a new sample scan based
on the retrieved zero scan.
3.3.5 Subtracting a spectrum
Once you store more than one spectrum, you can create a difference spectrum.