User`s guide

Obtaining Good Spectra in Continuous Extraction Mode
Voyager
™
Biospectrometry
™
Workstation User’s Guide H-15
H
Fine-tuning
threshold
When you determine the high and low setting for the sample
class/matrix you are analyzing, you can fine-tune the threshold
by setting the laser intensity midway between the high
setting and low setting determined above.
If signal is present when you decrease the laser, assume
that this is the new high setting. If signal is not present
when you decrease the laser, assume that this is the new
low setting.
Continue adjusting until the difference between high and
low settings is less than 10 laser counts.
NOTE: If the difference between the high and low setting is
equal to the laser step size, decrease the laser step size in
the Hardware Configuration by a factor of 2.
Figure H-6 shows a spectrum generated with an acceptable
laser intensity.
Figure H-6 Spectrum at Lower Laser Setting