Laboratory 3 - DSCL - Johns Hopkins University
Contents
1. ERTICAL HORIZONTAL menu buttons controls controls Floppy disk Input TRIGGER drive connectors controls Figure 1 The Tektronix TDS3000 Series Digital Phosphor Oscilloscope 2 1 Oscilloscope Probe Compensation You will find two oscilloscope probes in your drawer Connect them to the BNC connectors labeled CH1 and CH2 Follow the instructions given by your instructor and on page 6 of your manual to check probe compensation for CH1 Repeat for CH2 Note what you are doing for your lab writeup Note the magnitude and frequency of the test waveform Figure 2 1 4 5 6 ia RANGE Hz Tekt onix CFIi253 1M_ 100K _10K 1K 100 10 1 AMPI TUDE DC w FSET SYMw TRY FUNCTION Mr Ww rw FREQUENCY INVERT SWEEP SWEEP VOLTS OUT SYMMETRY sweep RATE WIDTH move a ANEI SYNC E am pover aac 13 12 11 10 9 8 The Tektronix CFG253 Signal Generator See manual for description of each function 2 2 Signal Generators and Periodic Waveforms Switch on the signal generator power Connect a BNC to Cliplead Test Lead to the MAIN output of the signal generator Connect the CH 1 Oscilloscope probe to the signal generator output clipleads as instructed by the instructor Using the signal generator instruction manual configure the signal generator to generate a sine wave that is approximately 10 Hz with 5V amp2. ME 530 241 Electronics and Instrumentation Lab 3 Function Generators Oscilloscopes and AC Signals Louis L Whitcomb and Kyle B Reed Department of Mechanical Engineering The Johns Hopkins University Spring 2009 Apparatuses Multimeter Tektronix PS280 DC Power Supply Tektronix TDS3014B oscillo scope Tektronix CFG 253 function generator leads breadboard Documents 1 This laboratory assignment 2 CFG253 Signal Generator User Manual 3 TDS3014 Oscilloscope User Manual 4 TDS3014 Oscilloscope Training Manual The above documents are available on the course web site here http dscl 1lcsr jhu edu ME530241_2009 1 Pre Lab Exercises Exercise 4 1 of I Exercise 4 2 of I Exercise 4 21 of I Exercise 4 23 of I o Fe WwW N e Exercise 4 32 of I Compute i average ii RMS and iii ration between average and RMS 6 Exercise 4 33 of I Compute the average power of the current through the specified inductor 2009 Noah J Cowan Louis L Whitcomb and Kyle B Reed do not reproduce without permission 2 Signal Generators and Oscilloscopes Side screen Menu function menu buttons controls Oscilloscope General purpose ACQUIRE display knob controls Source MENU VERTICAL CH 1 ACQUIRE CURSOR Quick coupling impedance Bandwiath Fastan Mode on Sscopelll 0OCQACEAN 1M COS A Full O u ea Ta ieee ee anes Bottom screen V
3. e e Get your station checked off by your TA References 1 Giorgio Rizzoni Fundamentals of Electrical Engineering McGraw Hill New York 2009 ME 530 241 Lab 3 Signal Generators Oscilloscopes and AC Signals My Secret Code My Partner s Secret Code Lab Date Lab Station Number Today s Date You must have the T A inspect your lab station at the end of your lab session T A Signature and Date
4. either put them on a USB memory stick e mail them to yourself use JShare or preferably some combination of these options to ensure that you do not lose your data When using the direct print interface press the printer button to print a color copy of the screen on the lab printer Note that both you and your partner will need to include the plot in your own lab report 2 Signal Generator Basics Generating Periodic Waveforms Experiment with the signal generator controls observe the effect on the resulting waveforms and discuss them with your instructor In each case note for your writeup the effect of each control i e briefly but concisely describe in words how the control effects the generator s output You will have to re adjust the scope display as the signal generator s output varies e Frequency Range Buttons e Frequency Knob e Amplitude e DC Offset e Symmetry e Signal square triangle sine 3 Generating and Measuring Periodic Waveforms with the Oscilloscope and Signal Generator Starting with the signal of the previous question adjust the horizontal and vertical scale and position of your scope to make a single sinusoid fill much of the screen Verify that the desired signal is being displayed a Use the horizontal cursors to measure the peak to peak voltage of the signal and adjust the signal generator to generate precise 5 0V amplitude i e 10 0 volts peak to peak Print and annotatd a copy of the measu
5. ion and displayed on CH1 use a probe on CH2 to connect to the scope s probe compensation test point Experiment with switching the Trigger from CH1 to CH2 and from CH2 to CH1 Experiment with different Trigger voltage levels and slopes Print and annotate one plot showing the scope triggering on CH2 and the two signals being displayed on CH1 and CH2 respectively 7 Consult the CFG253 Signal Generator to determine the characteristic impedance X Q of the main output of the device Draw a circuit diagram of the CFG253 function generator which idealizes the device as a sinusoidal voltage source in parallel with a internal resistor of X Q characteristic impedance What will happen to the output signal of the signal generator when you attach an external resistor of X Q Draw the circuit and compute the expected result Attach a resistor of X Q to the output of the signal generator Print and annotate a scope plot of the output WITH and WITHOUT this additional load resistor Does the experimentally observed behavior WITH and WITHOUT agree with your calcu lations REMEMBER e Remember to note your lab partner s secret code on your lab report as well as your lab station number e Return all electronic test equipment and components to their proper location e Remember to show your work e Typewritten reports are not required but messy or disorganized reports are unacceptable e Clean up your workstation to perfection when you are don
6. litude i e 10V peak to peak Let s look at and measure some periodic waveforms 1 Oscilloscope Basics Acquiring and Displaying Signals First display CH1 on the scope and remove CH2 from the scope display note that the CH1 MENU button toggles the display of CH1 on the screen Experiment with the following oscilloscope controls and discuss them with your partner if you are unsure of a function look it up on the user s manual If you are still unsure discuss it with your instructor In each case note for your writeup the effect of each control i e briefly but concisely describe how the control effects the scope display RUN STOP button CH1 Menu button Screen menu controls in the CH1 Menu CH1 Vertical position knob CH1 Vertical scale knob Horizontal position knob Horizontal scale knob Trigger Level knob Trigger Slope Now adjust the scope time X axis to display approximately two periods of the waveform from the signal generator Adjust the voltage Y axis scale so that the waveform is at least 1 2 the height of the screen There are two ways to get your data for inclusion in the lab report 1 Using the web browser on the PC go to the IP address of the oscilloscope to get a screen shot of the waveform for inclusion in your report or 2 Refer to the manual about how to print the plot directly to the printer When using the web interface to the oscilloscope you should save all of your files to disk and then
7. red signal for your lab report b Use the vertical cursors to measure the zero crossing to zero crossing period of the signal and adjust the signal generator nearly exactly to 1000 Hz Print and annotate a copy of the measured signal for your lab report c Enable the RMS auto measure function If any other auto measurements are being displayed remove them ask your TA if you are unsure of this i Compute the theoretical RMS value of the specified signal ii Note the measured RMS value of this signal iii Compare Experiment with the Trigger Level knob What does the trigger do Vary the trigger level Discuss what happens when the trigger level is too high or too Ne TR rm oO Sa NS a low On your plot add written annotation showing the horizontal and vertical scale and dimensions indicating that the waveform has the desired period amplitude and mean g What does the trigger slope do Print a plot and annotate it to indicate the precise trigger position X and Y time and voltage on the plot Be sure to indicate i Trigger Channel ii Trigger X position time iii Trigger Y position voltage graphical indicator iv Trigger Y position voltage numerical value v Trigger Slope 4 Repeat 3a Bc for a 100 Hz square wave with OV minimum and 5V maximum 5 Repeat 3a Bce for a 5000 Hz triangle wave with 5V minimum and 5V maximum 6 Leaving your signal generator as configured for the previous quest
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