Previous Next

*   Force Mass Tolerance
Use the Force Mass Tolerance feature to change mass tolerance values for scans that you select. When processing spectra with different mass tolerance settings of different origins, you might want to force tolerance values to create comparable data. The Mass Frontier application uses tolerance values when comparing two m/z values.
Note  Use the Force Mass Tolerance feature to check the correctness of search and calculation procedures by creating unit resolution from high accuracy/resolution data. You cannot improve accuracy using this feature.
v
To run the Force Mass Tolerance process
1.
If you select Force Tolerance Only to Current Filter in the Force Tolerance dialog box, the software processes only visible scans.
2.
Click the Chromatogram Processing Utilities button, , and choose Force Mass Tolerance.
The Force Tolerance dialog box opens. See Force Tolerance dialog box.
3.
If you select Force Tolerance Only to Current Filter, the software processes only visible scans.
4.
Click Calculate.
5.
Force Tolerance dialog box
Force Tolerance Only to Current Filter
ppm 1 000 000 x ΔM/M
Mass Accuracy (ΔM in AMU or ΔM in MMU)
M = m/z (mass-to-charge ratio)
ΔM = M2 – M1 (M1, M2 are two adjacent peaks)
Peaks (m/z values) that fall into the ΔM band are merged into a single peak (m/z value).
Opens the Save Force Tolerance Parameters File dialog box where you can save your current parameters to a Force Tolerance parameters file (.tolerance.par).
Opens the Open Force Tolerance Parameters File dialog box where you can choose a Force Tolerance parameters file (.tolerance.par) to load.


Previous Next
Related Topics:
  Fragment Ion Search (FISh)
  Matrix Conversion
  Thresholding
  Baseline Correction and Noise Elimination
  Smoothing
  Base Peak Chromatogram
  Background Subtraction
Copyright 1998 - 2013 HighChem Ltd., Slovakia