Campbell Scientific TGA200A TGA Series Trace Gas Analzyers - Page 69
TGA Series Trace Gas Analyzers, Laser current parameter settings for TGA Windows
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TGA Series Trace Gas Analyzers CAUTION Current The Settings > Laser > Current window is slightly different for TGA Windows and TGA TEC. TGA Windows (FIGURE 7-10) supports a rapid warm-up function to bring the laser more quickly to room temperature. This is helpful for periodic (typically annual) evacuation of the LN2 dewar. TE-cooled lasers do not require this feature. Therefore the Laser > Current screen of the TGA TEC does not show the option to heat the laser (FIGURE 7-11). Both versions have a box to turn the laser on/off. Check this box for normal operation. Uncheck this box to disable the laser current. The laser DC, Mod (modulation), Zero, and High currents determine the laser scan sequence. They should be set and optimized for the individual laser. The DC, Mod, Zero, and High current parameters may also be set from the Laser window. See Appendix C, Optimizing Laser Parameters, for details on how to set the laser current parameters. This section also discusses the Line Lock and Auto buttons next to the DC, Mod, and Zero currents. The Maximum laser current (mA) provides a safety limit. The TGA software will not allow the DC, Mod, Zero, or High current to be set to a value that would apply a current through the laser greater than this limit. Set this limit for the individual laser. Setting the maximum laser current parameter above a laser's safe operation current greatly increases the risk of damaging the laser. FIGURE 7-10. Laser current parameter settings for TGA Windows 55