# UK EE 462G - Measuring Capacitance (6 pages)

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## Measuring Capacitance

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- Pages:
- 6
- School:
- University of Kentucky
- Course:
- Ee 462g - Electronic Circuits Lab

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EE 462G Laboratory 1 Measuring Capacitance By Drs A V Radun and K D Donohue 9 5 06 Department of Electrical and Computer Engineering University of Kentucky Lexington KY 40506 Laboratory 1 period Pre lab and data sheet due for Laboratory 1 at the end of the class I Instructional Objectives Introduce lab instrumentation with linear circuit elements Introduce lab report format Develop and analyze measurement procedures based on 2 theoretical models Introduce automated lab measurement and data analysis II Background A circuit design requires a capacitor The value of an available capacitor cannot be determined from its markings so the value must be measured however a capacitance meter is not available The only available resources are different valued resistors a variable frequency signal generator a digital multimeter DMM and an oscilloscope Two possible ways of measuring the capacitor s value are described in the following paragraphs For this experiment the student needs to select resistors and frequencies that are convenient or feasible for the required measurements and instrumentation Be sure to use the digital multimeter DMM to measure and record the actual resistance values used in each measurement procedure III Pre Laboratory Exercise Step Response Model 1 For a series voltage source v t resistor R and capacitor C derive the complete solution for the capacitor voltage when the source is a step with amplitude A and the capacitor voltage is 0 right before the step function turns on 2 Assume the source v t is a function generator where the source voltage can only be measured after the 50 internal resistance Find the step response with amplitude A in terms of R and C for the both vc t and voltage measured at the output of the function generator vm t as shown in Fig 1 Hint First find vc t as in the previous problem now total circuit resistance becomes R 50 and the rest is the same Then the loop current is Cdvc dt and vm t is the drop over the circuit resistor vc R 50 v

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