Campbell Scientific TGA200A TGA Series Trace Gas Analzyers - Page 70
TGA Series Trace Gas Analyzers, Laser current parameter settings for TGA TEC, Settings
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TGA Series Trace Gas Analyzers FIGURE 7-11. Laser current parameter settings for TGA TEC Line Lock The Settings > Laser > Line Lock window sets limits used to temporarily disable the line lock function during an error condition. The line-lock function locks the absorption line to the center of the spectral scan, by automatically adjusting the DC current. Line locking must be active for normal operation (see Section 7.2.4, Laser Window, for information on making line lock active, and see Section 7.2.2, Status Window, for details on viewing the TGA line-lock status). The TGA monitors three conditions: • sample cell pressure • reference detector signal • reference detector transmittance The TGA will disable the line lock function if it detects a problem with any of these values. This prevents the line lock algorithm from misadjusting the DC current when the position of the absorption line cannot be determined reliably. In this case, the line locking algorithm is disabled temporarily. When the error condition no longer exists, the line locking is automatically re-enabled. The state of the line lock function is shown by three different icons on the button on the Settings > Laser > Current window and the Laser window. The appearance and function of those icons is shown in TABLE 7-1. 56
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