GENESIS SPECTRUM USER MANUAL

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Chapter 4Setup and Calibration18 GENESIS Spectrum - User’s Manual
Chapter 5 Spectrum Basics5 SPECTRUM BASICSThis chapter describes the various spectrum features such as data collection, saving,printing, scale adjustment, and editing or resetting view and printing options.5.1 Setting The Count Rate and Dead TimeSelect a count rate that is appropriate for the sample and the desired analysis. Forspectrum analysis it is often desired to use the best resolution possible. With the longercollection times in spectrum analysis, using a fast throughput is less of a priority than it isin mapping, where short dwell times require the maximization of throughput.Use the microscope condenser lens setting (typically known as spot size) that yields thedesired count rate. For spectrum collection, count rates often range from 1000 to 50,000counts per second.Select the Amp time that yields a dead time between 20 and 40 percent. The Amp time isselected from the drop down menu on the right hand side of the toolbar. For lower countrates longer processing times can be used. These provide the maximum resolution. As thecount rate increases the faster amp times should be selected to maintain an appropriatedead time. The fast time constants provide for the maximum throughput. The dead timecan be monitored in the status bar at the bottom of the screen.5.2 Auto AmpTimeThe last possible selection in the Amp Time drop down list is “Auto”.This selection will automatically select the Amp Time that is closest to a 30% dead timefor the current count rate. The selection of the Amp Time in this automatic mode will beinitiated by pressing the collect spectrum button or the “Collect Maps” button. The datacollection will start just after the selection of the amp time. The Amp Time selected will beshown in the status bar near the right side of the display. In order to effectively use thischoice, all Amp Times should be calibrated on a regular basis. This selection is onlypossible in the Spectrum & the Maps/Line tabs of Genesis.GENESIS Spectrum - User’s Manual19
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Page 8 and 9: Chapter 1Introduction to Genesis Sp
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Page 12 and 13: Chapter 2 Quick Start6 GENESIS Spec
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Page 26 and 27: Chapter 5Spectrum Basics5.3 Spectru
Page 28 and 29: Chapter 5Spectrum BasicsThe Home En
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Page 42 and 43: Chapter 6 Peak Identification and Q
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Page 68 and 69: Chapter 7Quantification7.2.6 Backgr
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Chapter 8 Auto Spectrum Processing8
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Chapter 9 TEM Materials Option9 TEM
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Chapter 9TEM Materials OptionEditin
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Chapter 9TEM Materials OptionCalcul
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Chapter 9TEM Materials Option9.1.5
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Chapter 9TEM Materials OptionSaveTh
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