Kami Export - Lab 11 Pre-Lab

Page 1 of 3 Date: ____________________ Bench #: ____________ Lab Section: _____________ Student Names (Print): ________________________________ CaseID: _____________ Student Names (Print): ________________________________ CaseID: _____________ Student Names (Print): ________________________________ CaseID: _____________ The pre-­‐lab assignment is used to check your preparedness for the lab. Complete 1 pre-­‐lab per group. To receive credit, a Lab TA must approve your pre-­‐lab. Problem 1 Fill in the blanks. “An inductor acts as a ___________________ at DC and a ____________________ at high frequency.” “A capacitor acts as a ____________________ at DC and a ____________________ at high frequency.” Problem 2 Write the equation for and draw a graph of the impedance of a resistor, capacitor, and inductor. Z R = Z C = Z L = ω Z C ω Z L ω Z R Fall 20 2 3 Version 2.0 ENGR 210 Pre-Labs Lab 11 RC and RL Filters

ENGR 210 Page 2 of 3 Note: In addition to showing the results on page 2 and 3, you must verify them by demonstrating the Multisim file to your lab TA. Have the Multisim file (.ms14) saved into your own USB stick and bring it in. Alternatively, save it on your CWRU Active Directory and use the lab desktop. (a) (b) Problem 3: Figure 1 This Multisim problem aims to observing the magnitude of the voltage-gain as the AC frequency source is swept. The analysis we will use in this problem is Single Frequency AC , which simulates the magnitude and phase of the circuit component(s) at a preset single frequency. For this problem, we will be interested in the magnitude only. i. Build both of the two circuits shown in Figure 1a and 1b . As in Prelab 8, the AC source component is AC_VOLTAGE. For each of V1 and V2 source, set the peak voltage, V pk =0.5V. ii. Go to Simulate >> Analyses and simulation. Under Active Analysis , select Single Frequency AC . Click on the Output tab. Add the following two expressions: V(2)/V(1) and V(4)/V(3) . These are the voltage gains for circuit a and b , respectively. iii. Now click on the Frequency parameters tab. Set the frequency at 10 Hz. Under the Output section, select the Complex number format : Magnitude/Phase . Click Run. iv. In each run, the Grapher View will display the voltage gains of the circuit a and b simultaneously. Record their magnitude values in 3 decimal places into Table 1 below. (N.B . The letter m indicates milli (or 10 -3 ) in the Grapher View results). v. Re-run the simulation for the next frequency value in the table 1. Repeat this until you fill out the entire table. Table 1: Single Frequency AC Analysis Results Frequency 10 Hz 100 Hz 250 Hz 500 Hz 1 kHz 2.5 kHz 5 kHz 7.5 kHz 10 kHz V(2)/V(1) V(4)/V(3) vi. Use the data in Table 1 to plot an MS Excel chart for V(2)/V(1) Vs Frequency . The chart type must be ‘ Scatter with smooth lines and markers’ . Label the axes. Paste the chart on page 3. Then, Make some comments on the graph. vii. Plot another chart for V(4)/V(3) Vs Frequency with labeled axes. Paste it on page 3. Comment on the graph. Multisim File Demonstrated: (TA initials)