Lab3-SupplementalNotes

Lab3-SupplementalNotes - Electrical Measurement Laboratory...

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1 Electrical Measurement Laboratory Laboratory #3 Overview of experiment #3 1. Thevenin Equivalent circuits 2. Input/output resistance measurement 3. Wheatstone Bridge Applications 4. Opamp circuits
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2 Thevenin/Norton Equivalent + - i v Linear network with independent sources + - v N i i + - i v + - Î Can replace with: Norton Equivalent Thevenin Equivalent th v th N R R = th R Thevenin Resistance + - i v Linear network with independent sources How to find R th ? 1. Calculate v oc . 2. Calculate i sc . 3. sc oc th i v R = + - i v oc + - Thevenin Equivalent th v th R i sc + - oc v th R Theoretical Approach What happens if we short circuit a pratical circuit with low thevenin resistance? (don’t use in lab!!)
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3 Thevenin/Norton Equivalent + - th v th R L R L v + th L th L L v R R R v + = L L L th th R v v v R = oc th v v = Linear network with independent sources L R Thev. equiv 1. Measure open circuit voltage to find v th . 2. Connect load resistor R L 3. Calculate R th . Value of R L ? Too small Æ too much current (may cause equipem Thevenin/Norton Equivalent + - th v th R L R L v + L L L th th R v v v R = Linear network with independent sources L R Thev. equiv Value of R L ? Too small Æ too much current (may cause equipment damage) Too large Æ numerical error in computation
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4 Input / Output resistance + - th v o R in R L v + Electrical circuit with independent sources Thev. equiv Electrical circuit R in R o Measuring Input Resistance + - in R L v + Device Under Test DUT + - i v s R L v + i v s L i L in R v v v R = s R
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This note was uploaded on 12/22/2010 for the course ECSE ECSE 291 taught by Professor Khazaka during the Winter '03 term at McGill.

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Lab3-SupplementalNotes - Electrical Measurement Laboratory...

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