Faculty of Engineering, Thammasat University

Transcription

1 Faculty of Engineering, Thammasat University Experiment 6: Oscilloscope (For room 506) Objectives: 1. To familiarize you with the Oscilloscope and Function Generator User Manual: Oscilloscope Figure 1: Oscilloscope control panel ON-OFF switch CH1 - Channel 1 input connector. PROBE COMP connector Use to electrically match the probe to the oscilloscope input circuit. AUTOSET button Automatically sets the oscilloscope controls to produce a usable display of the input signals. VOLTS/DIV knob Use to control how the oscilloscope amplifies or attenuates the source signal of channel waveforms. SEC/DIV knob Use to change the horizontal time scale to magnify or compress the waveform. DISPLAY SCREEN Channel Vertical Menus Use to set the functionality of each channel individually. Menu and Control Buttons 1

2 VERTICAL POSITION knob Use to adjust the position of the signal in the y-axis. HORIZONTAL POSITION knob Use to adjust the position of the signal in the x-axis. Function Generator Figure 2: Function Generator control panel 1. ON-OFF switch 2. Output Menus Use to select the type of the signal to be generated (i.e. Sine wave, Square wave, Triangle wave, etc ). 3. Enter Number Key Use to enter a number of voltage or frequency with the appropriate units. 4. Units Key Use after Enter Number Mode. 5. Control Knob Use to modify the displayed number. 6. Output connector Output the generated signal to the outside world. 7. Frequency and Amplitude Key Use to select the frequency and amplitude of the generated signal. 2

3 Experimental Setup & Procedure Oscilloscope Functional Check The functional check of the oscilloscope is used to ensure that your oscilloscope is operating correctly. By connecting the probe to the oscilloscope as shown below, you will see a square wave in the display of about 5V peak-to-peak at 1KHz. Figure 3: Connection of the oscilloscope and probe for the functional check 1. Connect the probe to the oscilloscope as shown in Figure 3 (i.e. connect the probe tip and reference lead to the PROBE COMP connectors). 2. Set the Volts/Div control to 2V/Div. 3. Set the Sec/Div control to 500µs. 4. Draw the waveform in the table provided. Question 1: How many divisions does the waveform occupy in the y-axis from maximum minimum voltage? Question 2: How many divisions does the waveform occupy in the x-axis for 1 period? Question 3: What is the peak-to-peak voltage of the displayed waveform? Question 4: What is the period of the displayed waveform? Question 5: What is the frequency of the displayed waveform? 5. Set the Volts/Div control to 5V/Div. 6. Set the Sec/Div control to 250 µs. 7. Draw the waveform in the table provided. Question 6: Repeat Question 1-5 for the new displayed waveform. DC Power supply and Oscilloscope 8. Set the output voltage of the DC power supply to 3V. 3

4 9. Set the Volts/Div control to 1V/Div. 10. Connect the output of the DC power supply to the oscilloscope (i.e. Red connector to the probe tip and Black connector to the reference lead). 11. Draw the waveform in the table provided. Question 7: How many divisions does the waveform lie above the x-axis for 1 period? Question 8: What is the voltage of the displayed waveform? 12. Set the output voltage of the DC power supply to 5V. 13. Set the Volts/Div control to 2V/Div. 14. Draw the waveform in the table provided. Question 9: Repeat Question 7-8 for the new displayed waveform. Function Generator and Oscilloscope 15. Connect the lead to the function generator as shown in Figure Connect the lead of the function generator to the probe of the oscilloscope (i.e. Red connector to the probe tip and Black connector to the reference lead). 17. Select the output of the function generator as a sine wave. 18. Set the amplitude of the sine wave to 10V peak-to-peak. 19. Set the frequency of the sine wave to 10KHz. 20. Set the Volts/Div control to 2V/Div. 21. Set the Sec/Div control to 25µs. 22. Draw the waveform in the table provided. Question 10: Repeat Question 1-5 for the new displayed waveform. 23. Change the output of the function generator to a square wave. 24. Set the Volts/Div control to 5V/Div. 25. Set the Sec/Div control to 50µs. 26. Draw the waveform in the table provided. Question 11: Repeat Question 1-5 for the new displayed waveform. 27. Change the output of the function generator to triangle wave. 28. Draw the waveform in the table provided. Question 12: Repeat Question 1-5 for the new displayed waveform. 29. Change the output of the function generator to a sine wave again. 30. Set the amplitude of the sine wave to 4V peak-to-peak. 31. Set the Volts/Div control to 2V/Div. 32. Draw the waveform in the table provided. Question 13: Repeat Question 1-5 for the new displayed waveform. 33. Change the frequency of the sine wave to 5KHz. 34. Draw the waveform in the table provided. 4

5 Question 14: Repeat Question 1-5 for the new displayed waveform. 35. Change the amplitude of the sine wave to 4Vrms. 36. Draw the waveform in the table provided. Question 15: Repeat Question 1-5 for the new displayed waveform. Question 16: Explain the relationship between (a) Vrms and V peak-to-peak. (b) Vrms and V peak 5

6 Experiment 6: Oscilloscope (For room 509) Objectives: 1. To familiarize you with the Oscilloscope and Function Generator User Manual: Oscilloscope (a) (b) Figure 1: Oscilloscope control panel 6

7 Here; Probe compensation output Use to electrically match the probe to the oscilloscope input circuit. AUTOSET button Automatically sets the oscilloscope controls to produce a usable display of the input signals. VOLTS/DIV knob Use to control how the oscilloscope amplifies or attenuates the source signal of channel waveforms. TIME/DIV knob Use to change the horizontal time scale to magnify or compress the waveform. VERTICAL POSITION knob Use to adjust the position of the signal in the y-axis. HORIZONTAL POSITION knob Use to adjust the position of the signal in the x-axis. Variable knob Increases or decreases value and moves to the next or previous parameter. Acquire key Configures the acquisition mode Display key Configures the display settings Cursor key Runs cursor measurements Utility key Configures the Hardcopy function, shows the system status, selects the menu language, runs the self calibration, and configures the probe compensation signal Help key Shows the Help contents on the display Measure key Configures and runs automatic measurements Save/Recall key Saves and recalls image, waveform, or panel settings Hardcopy key Copies image, waveform, or panel settings to an memory card Run/Stop key Runs or stops triggering Function Generator (a) 7

8 (b) Figure 2: Function Generator control panel Experimental Setup & Procedure Oscilloscope Functional Check The functional check of the oscilloscope is used to ensure that your oscilloscope is operating correctly. By connecting the probe to the oscilloscope as shown below, you will see a square wave in the display of about 2V peak-to-peak at 1KHz. 8

9 Figure 3: Connection of the oscilloscope and probe for the functional check 1. Connect the probe to the oscilloscope as shown in Figure 3 (i.e. connect the probe tip to the PROBE COMP connectors). 2. Set the Volts/Div control to 500 mv/div. 3. Set the Time/Div control to 500µs. 4. Draw the waveform in the table provided. Question 1: How many divisions does the waveform occupy in the y-axis from maximum minimum voltage? Question 2: How many divisions does the waveform occupy in the x-axis for 1 period? Question 3: What is the peak-to-peak voltage of the displayed waveform? Question 4: What is the period of the displayed waveform? Question 5: What is the frequency of the displayed waveform? 5. Set the Volts/Div control to 2 V/Div. 6. Set the Time/Div control to 250 µs. 7. Draw the waveform in the table provided. Question 6: Repeat Question 1-5 for the new displayed waveform. DC Power supply and Oscilloscope 8. Set the output voltage of the DC power supply to 3V. 9. Set the Volts/Div control to 1V/Div. 10. Connect the output of the DC power supply to the oscilloscope (i.e. Red connector to the probe tip and Black connector to the reference lead). 11. Draw the waveform in the table provided. Question 7: How many divisions does the waveform lie above the x-axis for 1 period? Question 8: What is the voltage of the displayed waveform? 12. Set the output voltage of the DC power supply to 5V. 13. Set the Volts/Div control to 2V/Div. 14. Draw the waveform in the table provided. Question 9: Repeat Question 7-8 for the new displayed waveform. Function Generator and Oscilloscope 15. Connect the lead to the function generator as shown in Figure Connect the lead of the function generator to the probe of the oscilloscope (i.e. Red connector to the probe tip and Black connector to the reference lead). 17. Select the output of the function generator as a sine wave. 18. Set the amplitude of the sine wave to 10V peak-to-peak. 9

10 19. Set the frequency of the sine wave to 10KHz. 20. Set the Volts/Div control to 2V/Div. 21. Set the Time/Div control to 25µs. 22. Draw the waveform in the table provided. Question 10: Repeat Question 1-5 for the new displayed waveform. 23. Change the output of the function generator to a square wave. 24. Set the Volts/Div control to 5V/Div. 25. Set the Time/Div control to 50µs. 26. Draw the waveform in the table provided. Question 11: Repeat Question 1-5 for the new displayed waveform. 27. Change the output of the function generator to triangle wave. 28. Draw the waveform in the table provided. Question 12: Repeat Question 1-5 for the new displayed waveform. 29. Change the output of the function generator to a sine wave again. 30. Set the amplitude of the sine wave to 4V peak-to-peak. 31. Set the Volts/Div control to 2V/Div. 32. Draw the waveform in the table provided. Question 13: Repeat Question 1-5 for the new displayed waveform. 33. Change the frequency of the sine wave to 5KHz. 34. Draw the waveform in the table provided. Question 14: Repeat Question 1-5 for the new displayed waveform. 35. Change the amplitude of the sine wave to 4Vrms. 36. Draw the waveform in the table provided. Question 15: Repeat Question 1-5 for the new displayed waveform. Question 16: Explain the relationship between (c) Vrms and V peak-to-peak. (d) Vrms and V peak 10