lab 3 handout

lab 3 handout - Electrical Measurement Laboratory...

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Electrical Measurement Laboratory Laboratory #3
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Overview of experiment #3 1. Thevenin Equivalent circuits 2. Input/output resistance measurement 3. Wheatstone Bridge Applications pamp circuits 4. Opamp circuits
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Thevenin/Norton Equivalent + i Linear network v with independent sources - an replace with: + i i Can replace with: th R - v N i + v + - th v th N R R - Norton Equivalent Thevenin Equivalent
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Thevenin Resistance + i Linear network i Thevenin Equivalent th R v with independent sources + v oc + - How to find R th ? - - th v th R Theoretical Approach (don’t use in lab!!) 1. Calculate v oc . 2. Calculate i sc . i sc + - oc v 3. sc oc th i v R What happens if we short circuit a pratical circuit with low thevenin resistance?
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Thevenin/Norton Equivalent th R Linear network ith dependent + - th v L R L v with independent sources L R oc th v v Thev. equiv th L th L L v R R R v 1. Measure open circuit voltage to find v th . 2. Connect load resistor R L L L L th th R v v v R 3. Calculate R th . Value of R L ?
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Thevenin/Norton Equivalent th R Linear network ith dependent + - th v L R L v with independent sources L R v v Thev. equiv L L L th th R v R Value of R L ? Too small too much current (may cause equipment damage) Too large numerical error in computation
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Input / Output resistance Electrical circuit ith dependent Electrical circuit with independent sources R in R o o R + - th v in R L v Thev. equiv
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Measuring Input Resistance Device Under Test s R DUT + - i v L v s R + - in R L v i v s L i L in R v v v R
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lab 3 handout - Electrical Measurement Laboratory...

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