ECE 2006 LABORATORY 2OSCILLOSCOPE X AND Y AXISRev. 1.0, January,2004PRE - LAB CALCULATIONS - NoneOBJECTIVESLearning objectives for this laboratory are to give the student the ability to:- Use oscilloscope axis positioning, sensitivity, and coupling controls.- Use the oscilloscope to measure voltages.REFERENCES- Digital Oscilloscope TDS 3012 B Series Reference ManualBACKGROUNDThis lab presents the basic controls of the oscilloscope. The oscilloscope can operate in either X-Y mode or in time base mode. In this lab the oscilloscope is operated in X-Y mode, which makes it similar to a piece of graph paper. There is an X channel and a Y channel on the oscilloscope. If only one is turned on then a one-dimensional graph will be displayed, whereas if both channels are on then the graph will be two-dimensional.The Vertical Menu has options to control the beam position, sensitivity, and coupling. The beam position control internally adds a DC offset voltage to the input voltage. This is used to move the display without changing the characteristics of the input. The sensitivity controls set the display scaling, specifying the number of volts per division in the graticule. The coupling control has three positions DC, AC and ground. In the DC position the scope will display the voltage for all frequencies from DC up to the scopes upper limit, typically 50 to 100 MHz. The AC position will filter out the DC component of the input signal. This has application when you want to observe a small AC signal superimposed on a large DC signal. The ground position replaces the input with 0 volts. This is useful when adjusting the beam to a 0 volt reference position. Note: The scope can also automatically set the 0 volt reference to the middle of the screen.Tip: The Quick menu sumarizes the important information about the scope channels. To change which channel is displayed, just press the channel selector button (yellow or blue).EQUIPMENT- Digital Oscilloscope TDS 3012 B Series- Function Generator- Power Supply- Resistor- CapacitorsPROCEDURE1. Oscilloscope Configuration (Y axis beam deflection)- Set the Oscilloscope to XY modeoTurn channel 1 OFF and turn channel 2 ONoPress the Display menu button. At the bottom there is a button that says “XY display”. Right now it should say “OFF”, select it. On the right side of the screen select “Triggered XY” to put the oscilloscope into XY mode.- Reference the scope In order to understand what is being displayed on the screen, there needs to bea reference point, a place where we define the voltage to be a specific value. Ground is the easiest. oPress the Vertical Menu buttonoPress the “Coupling button”oSelect Ground from the options on the right side of the displayoUse the Vertical position knob to move the ground to –4.00 divisions- Scale the displayNow that there is a reference point, there still needs to be a way to adjust the scale of the voltage being display. This is done by selecting the number of volts per division. oPress the Vertical Menu buttonoPress the “Fine Scale x/div”oUse the Vertical Scale knob to select 2 volts per division- Measure a DC voltageo Connect the power supply to Channel 2 of the oscilloscope using a BNC to alligator clip connector.oSet the power supply to 10 volts. Notice that your dot has not moved. This is because the oscilloscope is still grounded. To allow the oscilloscope to take measurements return to the Vertical Menu, choose the “Coupling button” and choose “DC” from the options on the right.oUse the oscilloscope measure menu to measure the amplitude of the powersupplies output. Have your Lab Instructor verify this measurement: _________________________2. Square Wave.- Reference the Scopeo Select “Ground Coupling” for Channel 2o Ground channel 2 of the oscilloscope to 0.00 divisionso Return Channel 2 to DC coupling- Produce a WaveformConnect the function generator to channel 2 of the oscilloscope using a BNC to BNC connector.oPress the “FREQ” button on the function generatoroSet to 1.00 Hz. Use the knob to change the value of the selected precision.Use the > < buttons to change the precision.oPress the square wave buttonoPress “AMPL” button to adjust the amplitude of the square wave.oUse the knob and > < keys to set 3.0 Vp-poPress “OFFSET” and adjust to 0.00 V DC- Visualize the Waveform on the Oscilloscopeo Adjust the function generator to 10.00 Hz (press the “Frequency” button)o Adjust the function generator to 100.00 HzHave your Lab Instructor verify this measurment: _________________________3. Sinusoidal Wave. - Produce a Wavformo Select a “SINE” wave on the function generator. oAdjust the function generator to 2.5 Vp-p. oAdjust the function generator to 1.00 Hz.- Visualize the WaveformoAdjust the function generator to 10.00 Hz.oAdjust the function generator to 100.00 Hz.oNotice the output is alternating between two voltage levels, however between the time delay on the screen and the time delay in your eye, you observe a straight line between +2.5 volts and –2.5 volts.- Save this screen image to foppy disk for use in a report.Have your Lab Instructor verify this measurement: _________________________4. Oscilloscope Configuration (X axis beam deflection)- Reference the Scopeo Select “Ground Coupling” for Channel 1o Ground channel 1 to 0.00 V.o Return Channel 1 to DC mode.- Switch Oscilloscope Channelso Switch the BNC connector from channel 2 to channel 1. Turn channel 1 ON and channel 2 OFF.- Scale the Displayo Set the Volts per Division to 1 V / div.- Visualize the Waveformo Adjust function generator to a 3 Vp-p SINE wave with no DC offset.o Adjust function generator to 1.00 HzoAdjust function generator to 10.00 HzoAdjust function generator to 100.00 HzHave your Lab Instructor verify this measurement: _________________________5. Oscilloscope Configuration (X & Y axes beam deflection)- Reference the Scopeo Ground both channels to 0.00 div, dot should be in the center of the screeno Connect the output of the function generator to both channel 1 and 2- Visualize the WaveformoAdjust the function generator to a 3 Vp-p SINE wave with no DC offset.oAdjust the function generator to 1.00 HzoAdjust the function generator to 10.00 Hz.oAdjust the function generator to 100.00 Hz.Have your Lab Instructor verify this measurement: _________________________6. Circle- Connect the circuit in Figure 1. Figure 1. π/2 radian phase shifting