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report_circuit_exp3

# report_circuit_exp3 - BERZEIT UNIVERSITY FACULTY OF...

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BERZEIT UNIVERSITY FACULTY OF ENGINEERING ELECTRICAL ENGINEERING DEPARTMENT Circuits & Electronics lab enee213 Experiment number 3 First and second order circuits Prepared by Muawiya Asali 1080369 Jihad Bessomi 1080332 Yasser Abu Qtesh 1081108 Supervised by Dr. Naser Ismael Assistant. Mohammad Daghra Section -1- Objective 1. To use the Oscilloscope to measure electric values. 2. To test and analyze the time responses of RL and RC circuits. 3. To test and analyze the time response of the second order RLC circuit. 4. To test the effect of the initial state of the dynamic elements on the time response. 5. To determine the first and second order circuits parameters from the circuit response. Equipment Used

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1. Digital Multi-meter. 2. Oscilloscope (TDS-2002B). 3. Power supply. 4. Signal generator. 5. KL-24002 and KL-24001 Basic Electricity Module. Theory this experiment has many concepts that we should be aware of before starting the real practical work . let’s introduce a brief explanation of each one of these terms: RC & RL circuits: Time Constant (τ): A measure of time required for certain changes in voltages and currents in RC and RL circuits. Generally, when the elapsed time exceeds five time constants (5τ) after switching has occurred, the currents and voltages have reached their final value, which is also called steady-state response. Mathematical formula: RC circuit τ = RC (0.63% of the max value) RL circuit τ = L / R We can determine the steady state voltage across the capacitor by observing the value of the voltage across it after a long time the input voltage has switched. VC(t) =V( 1- e^-t/RC) charging on the capacitor. In an RL circuit: The expression for the current build-up across the Inductor is given by : iL(t) = V/R( 1 – e-(R/L)t ) RLC circuit: First of all, there is a feature of RLC circuit that we should be aware of, which is called the damping factor:
According to the value of this factor we can evaluate the nature of the response. Another feature called attenuation factor alfa and its mathematical expression is: Other mathematical expression that we will need: - OS% (overshoot) = (Vm-Vf)/Vf *100% - Wd = ln(Vm) – ln(V2) / t2 – tm - Attenuation factor = 1/ t2 – tm Procedure For simplicity, let’s divide the procedure into parts as stated in the lab manual.

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report_circuit_exp3 - BERZEIT UNIVERSITY FACULTY OF...

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