Galvanic Applied Sciences 943-TGX-CE, Руководство по эксплуатации

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Revision 4 84 April 2020
Figure 53: Absorbance Page
The Absorbance Curve , or absorbance spectrum, shown on this page shows the
absorbance of the gas in the measurement cell, in absorbance units (AU) across the range
of 530 spectrometer pixels that are used by the analyzer for analysis. The exact X (pixel
number) and Y (AU) coordinates of each data point on the curve can be determined by
placing the mouse cursor over the data point of interest. The Y-axis scale can be adjusted
by clicking on the
Change Absorbance Curve Display Y Axis button. The Y-Axis
Maximum Value dialog box shown in Figure 54 will then appear.
Figure 54: Absorbance Curve Y-Axis Maximum Value Dialog Box
Enter in the desired minimum and maximum values for the Y-Axis scale and click on Save.
Note that the normal absorbance curve will rarely go above 1.5 AU or drop below 0 AU. The
displayed spectrum is updated once per second; to change to a static spectrum simply place
a checkbox into the
Stop Polling checkbox. Once changed to a static spectrum, a specific
section of the X-axis can be zoomed into by left clicking and holding on the desired starting
pixel then dragging the green highlight that appears to the desired end pixel. After releasing
the left mouse button, the selected pixel range will expand to fill the whole graph field. The
zoomed in section will also be shown in green the
Panorama View field, which shows an
overview of the entire collected spectrum. To return to the full spectrum, left click and hold
at the left side of the Panorama View field and drag the green area all the way the right side,
and the
Absorbance Curve view will return to the full absorbance spectrum.
The absorbance spectrum is calculated by subtracting the current transmission spectrum
from the transmission spectrum that was obtained the last time the analyzer carried out a
zero calibration cycle OR when the New Reference button was pressed on the Spectrum
panel, whichever was most recent. The y-axis of this spectrum is absorbance units (AU).