Campbell Scientific TGA100 Trace Gas Analyzer Manual - Manual (Page 16)

1.5 User Interface
The TGA100 includes a computer that provides the user interface. It displays the data in real time, allows the user to
modify control parameters, and saves data to the hard disk. The real time graphics screen is presented in
. In
the upper left corner is a box which displays the TGA software version, the laser and detector temperatures, and the
time. Beneath the time and temperature display is a blank area used for information and error message display. The rest
of the top of the screen has five menu columns: run mode, dynamic parameters, detector video, special function
enable/disable, and graph selections.
Figure 1-4
Figure 1-4. Real Time Graphics Screen
In the middle of the screen are graph 1 and graph 2, used to display certain user-selectable variables. This example
shows N
2
O concentration in graph 2 and laser temperature in graph 2.
Graph 3 is located at the bottom-center of the screen, and is also used to display user-selected variables. In this example
graph 3 shows the sample cell pressure.
At the bottom left corner of the screen are two high speed graphic windows that show the raw reference (REF) detector
signal and the raw sample (SMP) detector signal, scaled to match the analog-to-digital converter (ADC) input range.
At the bottom right corner of the screen are two more high speed graphic windows that display processed reference and
sample signals. The user may select the type of data to display in these windows using the Detector Video menu or the
Quick Keys. The number displayed at the top of these windows is either the transmittance or the absorbance of the
center of the spectral scan, depending on the display mode selected. All four of the high-speed graphic windows have
three vertical dashed lines. These lines show the center of the spectral scan and the range of data actually used to
calculate concentration.
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