Hitachi F 2500 Manual

							6 - 5 
6.3  Scale Change  
 
The X and Y-axis scales of data can be changed.   
Click the          (properties) button and select the Scale tab.     
Or right-click on the spectrum and select “Scale change.”   
 
 
 
Fig. 6-4  Scale Tab 
 
 
Enter values in the Maximum and Minimum columns for the X 
and Y axes.    The initial values are those that have been saved.   
The above window contains the following setting items.   
 
(1) X Axis  
Enter minimum and maximum values for the X axis.   
 
(2) Y Axis  
Enter minimum and maximum values for the Y axis.   
 
(3) Default Range  
System returns to initial values of X and Y axes.     
 
Scale can be expanded with the mouse.    Specify an area to be 
expanded.    Holding the mouse button held down, draw a 
rectangle, and then release the button.    Scale will be expanded.   
For returning to the original scale, click the Default Range button 
or the     button on the toolbar.  
6.3  
						

							6 - 6 
6.4    Change of Graph Axis   
 
The horizontal axis of a graph is changeable on a spectrum.   
Click the          (properties) button and select the Scale tab.     
 
 
 
Fig. 6-5  Scale Tab 
 
 
(1)  X Axis mode   
 
X-axis is indicated in either unit below. 
 
(a) nm  
Indicated in wavelength (nm). 
 
(b) Kcm-1  
Indicated in wavenumber (Kcm-1, K = 1000).   
x・λ = 10000 (x:    Kcm-1, λ:  nm)  
6.4    Change of Graph Axis  
						

							6 - 7 
6.5    Change of Spectral Line   
 
The line and color of a spectrum can be changed.    Select the 
Lines/Points tab of Spectrum Properties.    Upon clicking this tab, 
the window below appears.   
 
 
 
Fig. 6-6  Lines/Points Tab 
 
 
The following setting items are contained in this window.   
 
(1) Graph  
 
Select a spectrum for setting lines/points.   
 
(2) Display mode  
 
Data can be indicated in the following modes.   
• Lines 
• Points  
•  Lines & Points   
 
(3) Line pattern  
 
Specify the kind of line such as dotted line or solid line.     
 
(4) Point style  
 
Select the point style to be used in graph printing or display.   
 
6.5  
						

							6 - 8 
(5) Line color  
 
Use of the Color window enables you to change the color of 
spectral lines or points.    There are 48 basic colors.     
By clicking the Define Custom Colors button, a smaller 
window is added on the right side of the Color window as 
shown in Fig. 6-7.    And by clicking Define Custom Colors 
again, 16 colors are added.    These colors are usable or 
the spectral lines and points.    For defining the colors, 
entries can be made for Hue, Sat (saturation) and Lum 
(luminance), Red, Green and Blue.    When the definition is 
finished, click the Add to Custom Colors button.    Then, 
select the desired ones from the defined colors.   
 
 
 
Fig. 6-7 
6.5    Change of Spectral Line  
						

							6 - 9 
6.6    Detection of Spectral Peaks   
 
The spectral peaks and valleys are detectable automatically.   
Select the Find Peaks command from the Data menu or click   
          button, and a window as in Fig. 6-8 appears.     
Set Integration method, Threshold and Sensitivity.   
 
 
 
Fig. 6-8 
 
 
(1) Integration method  
 
The following three methods are available and any one may 
be selected for the peak wavelength.    But the area 
calculation result indicated in the peak table will vary with 
the selected method.   
• Rectangular  
• Trapezoid 
• Romberg 
 
For details of these methods, refer to APPENDIX D.     
 
(2) Threshold  
 
Set a detection limit for the photometric value axis of peaks 
and valleys.    Peaks and valleys below the set value will 
not be detected.   
Input range:    0.001 to 1000   
 
(3) Sensitivity  
 
Select the number of data points in X axis direction.     
For detection of sharp peaks, select a sensitivity level of 
“1,” and for broad peaks, select “8.”   
• 1  
• 2 
• 4 
• 8 
 6.6  
						

							6 - 10 
6.7    Indication of Peak Wavelength on Spectrum   
 
Select the Properties (O) command from the Edit (E) menu or 
click the     (properties) button on the Processing toolbar.   
The window in Fig. 6-9 will open.     
 
 
 
Fig. 6-9  Display Tab 
 
 
In the Comments under this tab, the following settings can be 
made.  
 
(1) None  
 
Only a spectrum is displayed.   
 
(2) Peak Number  
 
Peak No. is indicated on a spectrum.    This number is the 
one indicated in the peak table.   
 
(3) Peak Apex  
 
Peak wavelength is indicated on a spectrum.     
This wavelength is the one indicated in the peak table.     
It appears as shown in Fig. 5-9 and can be printed.   
 
(4) Valley No.  
 
Valley No. is indicated on a spectrum.    This number is the 
one indicated in the peak table.   
6.7    Indication of Peak Wavelength on Spectrum  
						

							6 - 11 
(5) Valley wavelength  
 
Valley wavelength is indicated on a spectrum.     
This wavelength is the one indicated in the peak table.     
It can be printed.   
 
(6)  Peak and Valley Number   
 
Peak and valley Nos. are indicated on a spectrum.     
These numbers are the ones indicated in the peak table.   
 
(7)  Peak and valley wavelength   
 
Peak and valley wavelengths are indicated on a spectrum.   
These wavelengths are the ones indicated in the peak table.   
They can be printed.   
 
 
 
Fig. 6-10 
6.7  
						

							6 - 12 
6.8  Smoothing of Spectrum  
 
Select the Smooth (S) command from the Data (D) menu or click 
the     button.  The window in Fig. 6-11 will open.  
 
 
 
Fig. 6-11 
 
 
Set the following parameters on this window.   
 
(1) Function type  
 
Select a smoothing method from the following three.   
• Savitsky-Golay  
• Mean 
• Median 
 
(2) Smoothing order  
 
Set a smoothing order.     
Input range:    2 to 4   
 
(3)  Number of points   
 
Set the number of points to be used in calculation.   
Input range:    5 to 101, Initial value:    7   
 
(4)  Number of times   
 
Set the number of smoothing operations.   
Input range:    1 to 100   
For returning to the original status (before calculation), click   
    .  
6.8  Smoothing of Spectrum  
						

							6 - 13 
6.9    Derivative Operation on Spectrum   
 
Select the Derivative (D) command from the Data (D) menu or 
click the     button.  The window in Fig. 6-12 will open.  
 
 
 
Fig. 6-12 
 
 
(1) Derivative order  
 
Set a derivative order.   
Input range:    1 to 4   
 
(2) Smoothing order  
 
Set a smoothing order.   
Input range:    2 to 4   
 
(3)  Number of points   
 
Set the number of points to be used in calculation.   
Input range:    5 to 101, Initial value:    15   
 
(4) Overlay derivative  
 
Spectra before and after derivative operation are overlaid 
for display.    Note that the value on Y axis is not the one 
after derivative operation.   
For returning to the original status (before calculation), click   
    .  
6.9  
						

							6 - 14 
6.10    Overlaid Display of Spectra   
 
This function is convenient for comparison of two or more 
spectra.   
There are 3 methods selectable for this function.   
 
(1)  Select the Overlay (O) command from the Data (D) menu.   
 
 
 
Fig. 6-13 
 
 
Click the Insert button and a list of files that allow overlay is 
displayed.    Select a file name and click the Open button.   
The selected sample name is added and displayed as in 
Fig. 6-14.    Now click the Close button.   
 
 
 
Fig. 6-14 
 
 
6.10    Overlaid Display of Spectra