FIU CHM 4130 - Key_for Chapters 1 and 5 (4 pages)

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Key_for Chapters 1 and 5



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CHAPTER 1 Key 1 A transducer is a device that converts chemical or physical information into an electrical signal or the reverse The most common input transducers convert chemical or physical information into a current voltage or charge and the most common output transducers convert electrical signals into some numerical form 3 The detector in a spectrograph is a photographic film or plate 5 A data domain is one of the modes in which data may be encoded Examples of data domain classes are the analog digital and time domains Examples of data domains are voltage current charge frequency period number 7 0 1 2 1 3 4 5 Output Transducer Use 6 78 961 LCD display Alphanumeric information Computer monitor Alphanumeric information text graphics 85 u 8 0 u 8 AB C D E8 u C Laser printercx B8EF 8 0 G 8 0 H Alphanumeric and graphical information F 85 u 8 0 H Motor Rotates to change position of attached elements I 8 J6 1 6 K 6 17 6 L K8 10 a Slope m 0 0701 intercept b 0 0083 F1H M 4 m D 8 B 4 4 b D 8 A FLH N 0 OPMJ 4 MQ 4 sm D 8 B4 MQ 4 sb D 8 F H E R 9 m m r t m K6 t 6 M 7 t S1 E R L1L 3 1 7 N 1 b c d From LINEST results SD slope sm 0 0007 SD intercept sb 0 0040 95 CI for slope m is m tsm where t is the Student t value for 95 probability and N 1 5 degrees of freedom 2 57 95 CI for m 0 0701 2 57 0 0007 0 0701 0 0018 or 0 070 0 002 For intercept 95 CI b tsb 0 0083 2 57 0 004 0 0083 0 010 or 0 08 0 01 cu 4 87 0 086 mM or 4 87 0 09 mM 2 c Thermal andshot noise 5 3 103 to 105 Hz and 106 to 107 Hz Enviromental noise is at a minimum in these regions see Figure 5 3 5 4 At the high CHAPTER 5 impedance Key of a glass electrode shielding is vital to minimize induced currents from power lines which can be amplified and can disturb the output 1 Frequency dependent noise sources flicker and environmental noise Frequency independent sources thermal and shot 5 5 a High pass filters are used to remove lownoise frequency flicker noise from higher 2 a Thermal noise frequency analytical signals b



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