10 - 46
HAPSITE ER Operating Manual
Min. Purity . . . . . . . . . . . . . . . . . . . . This compares the purity level of the
detected peak to the mass peak in the library.
Reasonable values depend the selectivity of
the calibration, but typically 0.5 to 0.9 is used.
A higher Min. Purity number is more
discriminative.
Noise Level Mult . . . . . . . . . . . . . . . The peak intensity must be greater than the
product of the Noise Level Mult number
multiplied by the baseline noise in order to be
identified as an analyte.
Precedence Level . . . . . . . . . . . . . . Determines if the search uses the global
parameters to use or compound-specific
parameters. Leaving this set to zero allows
for the use of specific search parameters for
individual compounds as discussed in
Chapter 11.
Min. Area . . . . . . . . . . . . . . . . . . . . . This number discriminates against low
responses which are usually attributed to
noise rather than analyte detection. Increase
this number to 10,000 or more if false
positives are encountered.
Max Width . . . . . . . . . . . . . . . . . . . . The peak must contain less scans than the
setpoint number.
Low Mass . . . . . . . . . . . . . . . . . . . . NIST will only use masses above this
setpoint to make an identification.
High Mass . . . . . . . . . . . . . . . . . . . . NIST will only use masses below this
setpoint to make an identification.
Minimum Match Factor . . . . . . . . . The net fit in AMDIS must be above this
number.
The Reset button resets the entered values to the default settings in the Peak
Search window. See Figure 10-51.
Figure 10-51 Resetting Default Search Parameters
To Next Page
Loading...
