- 25 -
//////////////////////////////////////////////////////////////////
View -> Zoom: ON/OFF
Allows a selected region to be expanded to a full graph.
This option will work for any view mode. You are prompted
for X-axis left and right wavelength and Y-axis top and
bottom. Selecting a bottom as a negative value allows
proper viewing for differential displays. The Y zoom also
can enabled by by right clicking on the Z button for mouse
XY zoom described below.
The status panel on bottom right of graph will show a "Z"
when zoom is in effect. This reminds you that the X axis
has been zoomed. You must re-select View -> Zoom to perform
an "unZOOM" or click the Z button on the toolbar or click
to the left side of the graph.
You may also use the mouse to zoom by clicking on the left
region and holding the button down while dragging (a box
will appear to be expanding as you move) to the right side
of the region of interest. When you lift the left mouse
button the selected region will appear as the full graph.
This process can be repeated several times, each time
refining the area of interest smaller and smaller.
//////////////////////////////////////////////////////////////////
View -> Graph Trace as: Overlay or 1st/2nd Derivative
These options apply to any SpectraWiz view mode. Overlay
allows the graph trace to continuously plot without erasing
the previous scan.
Using spectral derivatives eliminate problems with offset
differences in samples. The spectral data is converted to a
spectral reference of itself similar to measuring rate of
change or accelaration. It is common practice to use
spectral derivatives when generating Neural Network training
sets or performing PLS calibrations to determine spiecies
concentrations.
In order to display derivatives properly, the graph needs
to be centered about zero. This can be performed by
selecting the View -> Zoom and entering a negative number
for the ZYBOT value of the Y zoom parameter.
//////////////////////////////////////////////////////////////////
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels