LAB3_v4 - Faculty of Engineering Engineering Undergraduate...

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Faculty of Engineering Engineering Undergraduate Office Department of Electrical & Computer Engineering GenE 123: Electrical Engineering ME 123: Electrical Engineering for Mechanical Engineers Laboratory 3: The Oscilloscope and Operational Amplifier Circuits Contributors: DJ Brush, J Lowe, Z Zayouna, MY Dabbagh Last Revision: March 2011 Source: GE 123 Laboratory Manual, JD Aplevich, JD Cross, JD Leslie, MMA Salama, 1994
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UW – GenE/ME 123 – Lab 3 Manual Page 2 of 11 1. Objectives In this lab, you will become familiar with the functions and use of the oscilloscope. You will also connect, measure, and investigate various operational amplifier (OpAmp) circuits. 2. Background The oscilloscope is a device that plots voltage waveforms on a display screen. It draws a voltage- time graph, with the voltage on the Y-axis, and the time on the X-axis. Figure 2.1 shows an illustration of the oscilloscope you will use in the lab. The display screen is the rectangle with a grid in the centre of the figure. The control buttons, switches, and dials are grouped into 4 areas. The group on the left (CH1 and CH2) controls the vertical position and voltage scale for displaying one or two input signals. The group on the upper right controls the horizontal position and time scale for the display. The group on the lower right controls the display triggering (when the display starts drawing) and the group below the screen controls the screen intensity and clarity controls. The oscilloscope is connected to the circuit by the input terminals for each channel and the common or ground terminal (beside the power switch). Figure 2.1: Illustration of the lab oscilloscope
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UW – GenE/ME 123 – Lab 3 Manual Page 3 of 11 3. Pre-Lab Ex. 1 : Figure 3.1 shows a triangle voltage waveform on the oscilloscope screen with the following scale settings for the channel displayed: VOLTS/DIV = 0.5 V and TIME/DIV = 2 ms. The abbreviation DIV means the major divisions or lines on the screen grid. Ex. 2 : a) Find the amplification factor, Vout / Vin for the circuit shown in Fig. 3.2 . Show complete calculations. b) Draw both V out , and V in if V in is a triangular waveform similar to what shown in Fig. 3.1 . It has peak voltage of 3 volts and frequency 200 Hz. Indicate both voltage and time scales for this graph and all future plots! Use the grid in the “Write-Up” section. Figure 3.2: The inverting amplifier
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LAB3_v4 - Faculty of Engineering Engineering Undergraduate...

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