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Electronic Instrumentation Experiment 1 * Part A: Circuit Basics, Equipment, Sound Waves * Part B: Resistors, Circuit Analysis, Voltage Dividers * Part C: Capture/PSpice Part A Circuit Basics Equipment Sound Waves Automobile Electronics Previously all mechanical systems have become increasingly electronic Over the past few years, for example, the automobile has begun to use more computers (microcontrollers) How many microcontrollers are typically found in a modern automobile? Automobile Electronics Physical Model for a DC circuit Physical Model for Resistance Physics vs. Electronics Ohm’s Law Alternating Current Generators http://micro.magnet.fsu.edu/electromag/java/generator/ac.html AC Circuits Review of Sinusoids General form of the Sinusoid DC Source E3631A ADJUST VOLTAGE LEVEL TOGGLE OUTPUT ON/OFF -25 to 0 VOLTS 0 to 6 VOLTS GROUND GROUND 0 to 25 VOLTS Do Not Use Function Generator 33120A Digital Multimeter 34401A Oscilloscope 54600B Impedance Definition: a general measure of how a circuit affects the current through it. Impedance = resistance + reactance Impedance is used to refer to the behavior of circuits with resistors, capacitors and other components. In a resistive circuit, impedance=resistance. Equipment Impedances Each measuring device changes the circuit when you use it. The impedance of the device helps you understand how much. Device Impedances • • • • • Function Generator: 50 ohms ‘Scope: 1Meg ohms DMM (DC voltage): 10Meg ohms DMM (AC voltage): 1Meg ohms DMM (DC current): 5 ohms (negligible) Effect of Impedance on Circuit What to do How Ears Work http://members.aol.com/tonyjeffs/text/dia.htm Part B Resistors Circuit Analysis Voltage Dividers Combining Resistors in Series Combining Resistors in Parallel Reading Resistors http://www.dannyg.com/javascript/res/resload.htm Measuring Voltage Voltage Dividers More on Voltage Dividers Kirchoff’s Laws Circuit Analysis (Kirchoff Method) Circuit Analysis (Combination Method) Protoboards Part C Capture/PSpice • Circuit Analysis Software Capture Simulations PSpice Cursors Adding Traces