1.5k. (a) Resistive Circuit (b) Capacitive Circuit

Transcription

1 Objective Information The purposes of this laboratory project are to become further acquainted with the use of an oscilloscope, and to observe the behavior of resistor and resistor capacitor circuits. No new equipment are introduced in this project. However, new functionality of the function generator and oscilloscope will be introduced. Pre laboratory Work This work will be submitted to the Laboratory Project 7 Pre Laboratory Analysis dropbox at the beginning of the week of the laboratory project. For the circuits in Fig. 1, with Vs=5 VAC, do a frequency sweep using B2Spice. Sweep over the range of 10Hz to 1MHz with 100 points per decade. Use a logarithmic rather than a linear sweep (i.e. the horizontal axis should be a logarithmic scale). Obtain results for both the magnitude and phase of the voltage v2. V1 V2 V1 V2 Vs Vs 10nF (a) Resistive Circuit (b) Capacitive Circuit Fig. 1. These are the circuits to be simulated in B2Spice Submit both schematics and the results for the magnitude and phase shift from each simulation to the prelaboratory assignment in Canvas. Procedure In EGH337: Resistive vs. Resistor Capacitor Circuits. 1. Apply a sinusoidal voltage with a peak of 5V (actual peak, not the setting on the function generator. This means that the oscilloscope should display 10V peak to peak) and a frequency of 10 khz to each of the circuits in Fig. 1. Measure and record the amplitude and the frequency of the input and output. Also, measure the phase shift between the peaks of V1 and V2. To measure the phase shift: i. Press the Meas button. ii. Press the button next to the Time. iii. To display the phase angle on the screen, use the select knob to select the Phas A B option that produces an angle less than 90. Pha_F2 1 should produce the correct phase angle. This measurement is adjusted by pressing the Menu button and pressing the button next to the large down arrow. Select PhaseA to be CH2 and PhaseB to be CH1. iv. Record the magnitude of the phase shift displayed on the screen. v. Observe both V1 and V2 on the same graph for each circuit. With the peak to peak voltage for channels one and two displayed, along with the phase shift, download the oscilloscope image. 1 of 5

2 1. Open a Word document and open Intuilink from the computer desktop. 2. If the program is not in the Windows menu it is found in: C:\Program Files (x86)\agilent\intuilink\data Capture a. The program is named agtdtcpt2.exe Downloading images from the Keysight 1xxx series oscilloscopes. b. In any operation of the Keysight oscilloscope if Rmt appears on the screen press Force Trigger (Local) to enable the oscilloscope inputs. c. With the oscilloscope on start Intuilink Data Capture from Windows. d. Under Instrument select Agilent 1000 Series e. Under the Set I/O tab, click Find Instrument f. Under Select Address(es), select the address beginning with USB g. Click Identify Instrument(s) h. Select the oscilloscope and click OK to close the Find Instrument dialog box i. Click OK on the Agilent 1000 Series Add In dialog box 3. At this point two windows should appear within the Agilent Intuilink Data Capture window. a. One is a screen shot that can be copied as an image. i. This can be copied and pasted into a Word document or saved as a png or bmp. b. One is a text data file. i. This can be imported and manipulated in a program like Excel. 4. To download another image click on the Get Data icon. 5. Download the oscilloscope image to the Word document a. The resolution of the image is dependent upon the size of the window when the screen is captured, so maximize the screen window before capturing data. Press Run/Stop before downloading the screen. b. If the image does not paste with the correct orientation: i. Right click on the image and select Size and Position ii. Under absolute height enter 3 inches iii. Under rotation enter 90 degrees iv. The image should now be upright and of an appropriate size for a document. c. If the image is oriented correctly, resize the image using the above procedure. i. Save your Word document to your user drive. ii. Press Run/Stop to perform the next measurement. 2. For the capacitive circuit repeat part 1 for frequencies of 100Hz, 1kHz, 100kHz and 1 MHz. Record the amplitudes, measured frequency and phase shift for each frequency. (Remember that you did a measurement at 10kHz in the previous step. Those data should be included here for the resistive capacitive circuit.) Images do not have to be saved for each measurement. Determine the phase shift at each frequency. The magnitude of the phase shift should be less than If your results exceed this, ask for assistance. 3. Apply the signal shown in Fig. 3 to each of the circuits. Measure the amplitude and the 2 of 5

3 Download the images from the oscilloscope. i. Note: the frequency of the signal in Fig. 3 can be determined by dividing 1 by Fig. 2 shows a symmetric square wave input for the circuit so that switching behavior can be observed. 4. Apply the signal shown in Fig. 4 to each of the circuits. Measure the amplitude and the Download images from the oscilloscope. i. Note: the frequency of the signal Fig. 4 can be determined by dividing 1 by the period of the signal. ii. Use the square waveform. iii. Use the duty cycle function to change the width of the waveform. Fig. 3 shows a square wave with an adjusted duty cycle so that the adjustment of the input duty cycle can be learned and so that any changes to the output voltage waveform can be observed. Using the Analog Discovery: Resistive vs. Resistor Capacitor Circuits. 1. Apply a sinusoidal voltage with a peak of 5V and a frequency of 10 khz to each of the circuits in Fig. 2. Measure and record the amplitude and the frequency of the input and output. Also, measure the phase shift between the peaks of V1 and V2. To measure the phase shift: iv. Under the View menu add Measurements. 1. Add Defined Measurement Channel1 Vertical Peak2Peak 2. Add Defined Measurement Channel2 Horizontal Frequency 3. Add Defined Measurement Channel1 Vertical Peak2Peak 3 of 5

4 Assignment 4. Add Defined Measurement Channel2 Horizontal Frequency 5. Add Custom Global a. This should add Phase v. Observe both V1 and V2 on the same graph for each circuit. With the peak to peak voltage for channels one and two displayed, along with the phase shift, download the oscilloscope image. 1. Open a Word document 2. Download the oscilloscope image to the Word document a. The simplest way to do this may be grabbing the scope window and measurements using the snipping tool. b. If the image does not paste with the correct orientation: i. Right click on the image and select Size and Position ii. Under absolute height enter 3 inches iii. Under rotation enter 90 degrees iv. The image should now be upright and of an appropriate size for a document. c. If the image is oriented correctly, resize the image using the above procedure. i. Save your Word document to your user drive. ii. Press Run/Stop to perform the next measurement. 2. For the capacitive circuit repeat part 1 for frequencies of 100Hz, 1kHz, 100kHz and 1 MHz. Record the amplitudes, measured frequency and phase shift for each frequency. (Remember that you did a measurement at 10kHz in the previous step. Those data should be included here for the resistive capacitive circuit.) Images do not have to be saved for each measurement. Determine the phase shift at each frequency. The magnitude of the phase shift should be less than If your results exceed this, ask for assistance. 3. Apply the signal shown in Fig. 3 to each of the circuits. Measure the amplitude and the Download the image from the oscilloscope. vi. Note: the frequency of the signal in Fig. 3 can be determined by dividing 1 by 4. Apply the signal shown in Fig. 4 to each of the circuits. Measure the amplitude and the Download images from the oscilloscope. vii. Note: the frequency of the signal in Fig. 4 can be determined by dividing 1 by viii. Use the square waveform. ix. Use the Symmetry function to change the width of the waveform. Generate a laboratory report following the informal laboratory report format from the electrical engineering department webpage and includes all applicable sections. In the laboratory project report, discuss how the response of RC circuits differs from the response of resistive circuits. Include all data measured in the laboratory. The magnitude and phase of the sinusoids should be graphed and shown next to or on the same graph as the simulations results to compare the simulated and measured results for the capacitive circuit. Include images of the waveforms required in the laboratory procedure. 4 of 5

5 Check off All figures, tables, and graphs must be descriptively captioned. In order to receive credit for performing this laboratory project it is necessary to have the instructor or student lab assistant review your data. The data must then be submitted for the laboratory project data assignment in Canvas for this project (only files in pdf are accepted). 5 of 5