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Unformatted text preview: 8/21/2007 METR 3613  Lecture 3 METR 3613: Meteorological Measurement Systems Fall 2007 Dr. Petra Klein Lecture 2: Basic Electronics and Surface Observation Systems Copyright © 2004, Board of Regents of the University of Oklahoma. All Rights Reserved. 8/21/2007 METR 3613  Lecture 3 Outline ¡ A Quick Review of Basic Electronics ¡ Surface Observation Systems ¢ Introduction ¢ Oklahoma Mesonet ¡ Technical Overview ¢ ASOS 8/21/2007 METR 3613  Lecture 3 Ohm’s Law ¡ The voltage V across a resistor is related to the resistance R and current I as follows: ¡ Units: ¢ Resistance: Ohm, Ω ¢ Current: Ampere, A ¢ Voltage: Volt, V R V I I R V I V R = ⇔ ⋅ = ⇔ = 8/21/2007 METR 3613  Lecture 3 Kirchhoff Laws ¡ 1. Law: Junction Rule: For any given junction or node in a circuit the sum of the currents entering the node equals the sum of currents leaving the node ¢ Statement of charge conservation ¢ I 1 =I 2 +I 3 I 1 I 3 I 2 8/21/2007 METR 3613  Lecture 3 Kirchhoff Laws ¡ 2. Law: Loop Rule: Around any closed loop in a circuit the sum of the voltage drops is zero ¢ Statement of energy conservation 8/21/2007 METR 3613  Lecture 3 Resistors in Series 2 1 2 1 2 1 2 1 : Law s Ohm' : Law Kirchhoff 2. : Law Kirchhoff 1. R R R I R I R I R I R V V V V I I I tot tot tot + = ⋅ + ⋅ = ⋅ ⋅ = + = ≡ = 1 R 2 R 2 V tot V 1 V 8/21/2007 METR 3613  Lecture 3 Resistors in Parallel 2 1 2 1 2 1 2 1 2 1 1 2 1 1 1 / / / / : Law s Ohm' : Law Kirchhoff 1. : Law Kirchhoff 2. 2 , 1 R R R R R /R /R /R R V R V R V R V I I I I V V V V tot tot tot R + = ⇔ + = + = = = + − = ≡ 1 R 2 R 2 V 1 V 1 I 2 I I I 8/21/2007 METR 3613  Lecture 3 Voltage Divider 2 1 2 2 1 2 2 : Law s Ohm' R R R V V R R V R V I I R V R V I I R V I V R R T R tot R + = ⎪ ⎭ ⎪ ⎬ ⎫ + = = = = ⇔ ⋅ = ⇔ = 1 R 2 R 2 V R V 8/21/2007 METR 3613  Lecture 3 Bridge Circuit ( ) ( ) ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + = − = Δ = = + = ≡ = ≡ = = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + − + = − = Δ + = + = 2 : datalogger for signal input is difference Voltage 2 2 , ) ( and : n applicatio Typical : difference Voltage , 2 1 2 1 2 4 3 1 4 3 4 2 1 2 2 1 4 3 4 2 2 1 2 1 R T T R R R T T R T R R R R V R R R V V V V V R R V V R R R V V...
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This note was uploaded on 04/08/2008 for the course METR 3613 taught by Professor Klien during the Fall '07 term at The University of Oklahoma.
 Fall '07
 KLIEN

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