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Full set of Notes with Fill-Ins - San Jose State University

Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 10 Page 192 <strong>of</strong> 316Single vs. double-beam instruments:Single-beam design: Measure blank signal (Po),digitize and record the number, replace blank<strong>with</strong> sample cuvette, measure P, calculate A.Advantages <strong>of</strong> single beam designs:Simple design, relatively inexpensive.Disadvantages <strong>of</strong> single beam designs:P and Po are measured at different times so aparticular noise source is prominent:i.e. slow change in:o source intensityo detector sensitivitygivesPage 192 <strong>of</strong> 316driftabsorbance error.

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