Answer Happy

NO For our purposes, have both the scope and probes set to 10x. If they don't match, voltage readings on the scope screen will be off by a factor of 10 or 100 The alligator ground clip must be hooked to the ground node of the circuitor voltage source being measured. Just like a DMM, you cannot measure voltage with only 1 probe tip, as voltage is a potential DIFFERENCE between 2 points. Note however that both channels of the scope have a common ground, SO NEVER HOOK THE 2 PROBES GROUND CLIPS TO DIFFERENT POINTS IN THE CIRCUIT. Doing so creates a short circuit between those points, impairing circuit function and possibly causing damage to parts or equipment Figure 4: Typical Scope Probe courtesy penis vansville.com Procedure: Measuring AC with the Oscilloscope Tip A Xr01 Ya 21 1.00 VE - We will set the function generator to produce a 1 kHz sine wave, 2 Vpp, and measure it with the DSO, as detailed in the following instructions. USE A COAX CABLE with alligator clips (NOT A SCOPE PROBE) to connect the generator OUTPUT to the voltage divider circuit on a breadboard, shown in Figure 5: va LILO Figure 5: Voltage Divider Circuit ESTEKO Setting up the Function Generator (FG) ODOBE ODOO @2010 TBOOL واله | The generator's control 599 panel is shown at right. To generate a 1 kHz sine wave, 1. Turn on the power 0 10 (lower left button). 2. Push the blue FREQuency button, which will allow you to adjust the generated frequency 3. Push "1" followed by the "kHz Rus" button at far right. 8/17/2020

4. Plug a coax (BNC) to alligator-clip cable onto the rightmost connector. DO NOT USE A SCOPE PROBE. Use the red/black clip cable. Then hook a scope probe (already attached to the oscope) tip to the red alligator, and the scope ground black alligator to the FG cable black alligator. 5. Turn on the scope and press its "Autoset" button to display the wave. 6. Press the function generator AMPLitude button, and rotate the large knob to adjust wave height to the desired level on the scope screen. You will see the V value displayed on the FG screen as the knob moves; it is MISLEADING - trust only the scope values, not the FG screen values for voltages. If the numbers and wave size are moving too slowly or rapidly for your tastes, the arrow buttons above the knob move the cursor in the display to more or less significant digit places Note: You may change any of the function generator settings in any order. wwws rcc Setting up the Tektronix TDS2002 Digital Scope (DSO): ECC o 1. Make sure a probe is plugged into each of the CH 1 and CH 2 connectors No probe should be plugged into the EXT TRIG connector. Figure 7: Tektronix TDS2002 DSO 2. Press the yellow CH 1 MENU button, which is above the CH 1 probe connector. On the right side of the screen, you will see 5 settings that may be changed, via the 5 unlabeled buttons to the right of the screen. Make sure that • Coupling = DC. If not, press the nearby button until DC shows. • Invert = off. If not, press the nearby button Probe = 10x 3. if the scope probes have slider switches to choose 1x vs. 10x, set them to 10x. 4. Then press the blue CH 2 MENU button, and assure that its settings match Channel 1's above. Va 5. Connect the CH1 (yellow) probe to the circuit to measure Va at the top of R1, as shown in the schematic. Make sure you attach the ground (alligator) clip from one of the scope probes to the Vb circuit ground. Only one of the scope grounds needs to be connected, because the 2 probes' grounds are SR 2 internally connected inside the scope. DO NOT ATTACH the CH2 (blue) probe to the Vb point yet. XSCI XFG1 Cat SR1 1ko 1kΩ H H

Figure 8: Voltage Divider Circuit with Scope connections, including both CHI and CH2 probes. Note that the ground alligator connection (far right of schematic) actually is inside the same cable and coax connector as the probes. 6. Power on the circuit. 7. Press the black "AUTO SET" button, on the upper right of the front panel of the DSO. A waveform in yellow should appear neatly scaled on your screen. If the wave is less that 2 divisions high, rotate the VOLTS/DIV knob for that channel to increase the height to at least 2 divisions. The screen should resemble the picture at right. Note the CH1 Vpp and frequency the DSO reports beneath the waveform in the grid area. Adjust the function generator "LEVEL" knob until the waveform measures 2 Vpp. Figure 9: CH1 scope display 8. Record the measurements: CH1 volts/division: Time/division: CH1 Frequency: www Hz 9. Draw on the simulated screen below the waveform you see:

. 10. Next, connect the CH2 (blue) probe to point Vb of the circuit schematic (the top of R2). Again press the black "AUTO SET" button of the DSO. Waveforms in yellow (CH1) and blue (CH2) should appear neatly scaled on your screen. They will not be the same size If you do not see 2 different waves, try pressing the CH1 MENU yellow button, then the CH2 MENU blue button. If you still do not see 2 waves, ask your instructor for assistance. If either wave is less that 2 divisions high, rotate the VOLTS/DIV knob for that channel to increase the height to at least 2 divisions. The screen should resemble the picture below. Note: in this case, the CH1 knob was rotated to make both channel scale factors equal 500 mv per division. CHI is on top . MODOS Val 11. Record below the measurements the scope is reporting: CH1 volts/division: CH2 volts/division: Time/division: CH1 Frequency: Hz 12. Draw on the simulated screen below the waveforms you see: 13. Now calculate the peak to peak voltages of each waveform, by multiplying the volts/division by the height in gridmarks, of each wave. CH1 Vpp- ___ CH2 Vpp- From these measurements, what can you conclude about the VDR (Voltage Divider Rule) and AC voltages? 14. Next, rotate the VOLTS/DIV knob for CH1 one click clockwise. How does it affect the height of the waveforms? What VOLTS/DIV does the display now show for CH1 ? V/div net Adhemaillonnan 9/17

Figure 8: Voltage Divider Circuit with Scope connections, including both CH1 and CH2 probes. Note that the ground alligator connection (far right of schematic) actually is inside the same cable and coax connector as the probes. 6. Power on the circuit 7. Press the black "AUTO SET" button on the upper right of the front panel of the DSO. A waveform in yellow should appear neatly scaled on your screen. - If the wave is less that 2 divisions high, rotate the VOLTS/DIV knob for that channel to increase the height to at least 2 divisions. The screen should resemble the picture at right. Note the CH1 Vpp and frequency the DSO reports beneath the waveform in the grid area. Adjust the function generator "LEVEL" knob until the waveform measures 2 Vpp. MM Figure 9: CH1 scope display 8. Record the measurements: CH1 volts/division: Time/division: CH1 Frequency: Hz 9. Draw on the simulated screen below the waveform you see: