lab4_u11_Multsim_OScope

lab4_u11_Multsim_OScope - University of Florida Department...

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University of Florida EEL 3111 — Summer 2011 Drs. E. M. Schwartz & R. Srivastava Department of Electrical & Computer Engineering Ode Ojowu, TA Page 1/8 Revision 0 8-Jun-11 Lab 4: Multisim and the Oscilloscope OBJECTIVES Learn new Multisim components and instruments. Conduct a Multisim transient analysis. Gain proficiency in the function generator and oscilloscope. MATERIALS Multisim screen shots sent to TA. INTRODUCTION So far we have used Multisim to simulate simple DC circuits. In this lab we will work with new components, instruments, and analyses. We will introduce dependent sources in DC circuits. On the AC side, we will work with the transient analysis, function generator, and oscilloscope. Dependent Sources Figure 1 – Dependent sources depicted by Multisim. CCVS = current-controlled voltage source, VCVS = voltage-controlled voltage source, CCCS = current-controlled current source, and VCCS = voltage-controlled current source. To place a dependent source, go to Place > Component and select the Sources group. They are found under the headings CONTROLLED_CURRENT_SOURCES and CONTROLLED_VOLTAGE_SOURCES . As can be seen in Fig. 1, a dependent source has two components. The actual source is on the right hand side. The device on the left hand side acts as a voltmeter or ammeter and measures the quantity which determines the dependent source’s output. For the VCVS and CCCS, the quantity 1 V/V and 1 A/A represent the voltage and current gains, respectively. For the CCVS, 1 represents the transresistance, or ratio of output voltage to input current. For the VCCS, 1 Mho is the transconductance, or ratio of output current to input voltage. The unit Mho for transconductance is the name for -1 . These parameters are the multipliers of the controlling value and must be set to the appropriate multiplier value. Consider for example, the circuit in Fig. 2. In this case, we have a CCCS which produces a current that is 4 times the value of the current i . In Fig. 3, we have the Multisim implementation of this circuit. Notice that the current i has been redirected through the “meter” of the controlled source. It is important to ensure that the current passes through the “meter” in the same direction as the arrow. The gain has been set to 4. Two handy commands for positioning the CCCS are alt + X for flipping the component horizontally and ctrl + R for rotating the component. V1 1 V2 1 V/V I1 1 A/A I2 1 Mho CCVS VCVS CCCS VCCS
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University of Florida EEL 3111 — Summer 2011 Drs. E. M. Schwartz & R. Srivastava Department of Electrical & Computer Engineering Ode Ojowu, TA Page 2/8 Revision 0 8-Jun-11 Lab 4: Multisim and the Oscilloscope Figure 2 – Example circuit for a CCCS. Figure 3 – Multisim implementation of the CCCS.
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lab4_u11_Multsim_OScope - University of Florida Department...

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