Waters 2489, Operator'S Manual

Page: 117 / 234

Scanning spectra 3-49
Zero scan
To program a zero scan:
1. Press SCAN, then 1, New scan, and press 2, Zero scan.
2. Press Next to advance to the second Zero scan parameter screen.
3. Enter the starting wavelength for the zero scan, then press Enter.
4. Enter the ending wavelength for the zero scan, then press Enter.
5. Enter a value in the Pace field for the rate at which the detector scans
the specified wavelength range. The default is 100 nm/min. The
allowable range is from 30 to 1000 nm. Refer to the figure on
page 3-45 ,
which shows two scans of anthracene overlaid, one at 100 nm/min and
one at 1000 nm/min.
Tip: The higher the number you enter in the Pace field, the lower the
resolution of the scan.
6. Press Next to advance to the third Zero scan parameter screen.
7. Enter the AUFS value, then press Enter.
Sample and zero scan parameters
Parameter Screen Scan Type Units Range or Default
Type 1 Sample and
zero
n/a Sample scan: 1
Zero scan: 2
Default: 1
λ
range 2 Zero scan only nm Range: 190 to 700 nm
Default: 190 to 700 nm
Pace 2 Zero scan only nm/min Range: 30 to 1000
nm/min
Default: 100 nm/min
AUFS 2 or 3 Sample and
zero AU Range: 0.0001 to 4.0000
Default: Last number
entered
Tickmark
(Mark each
nm) 2 or 3 Sample and
zero nm Range: 10 to 100
Default: Last number
entered