1. Functional check: Oscilloscope manual page 5. Perform the functional check (photo).
|Picture 1.1 shows the functional check for the 1st port on the oscilloscope|
|Picture 1.2 shows the functional check for the second port.|
2. Perform manual probe compensation (Oscilloscope manual page 8) (Photo of overcompensation and proper compensation).
|Picture 2.1 shows a functional check when the probe is overcompensation|
|Picture 2.2 shows a functional check when the probe is proper compensation|
Using 1x on the porobe limits the bandwidth to 7MHz where 10x uses the full bandwidth. The 10x also reduces the amplitude of the signal 10x more than 1x probe. The 10x also does not disrupt the circuit reading as much as the 1x which can change the waveform readings. The 1x probe is only better for reading low voltage measurements.
4. How do vertical and horizontal controls work? Why would you need it (Oscilloscope manual pages 34-35)?
By using vertical positioning knobs for graph one you can change where the displays on the y axis by moving up and down on the y axis. Using the horizontal knobs changes the view of the display left and right down the x axis. These allows us to shift the waveform on the display to get more accurate reading and to compare it to other waveforms.
5. Generate a 1 kHz, 0.5 Vpp around a DC 1 V from the function generator (use the output connector). DO NOT USE oscilloscope probes for the function generator. There is a separate BNC cable for the function generator.
a. Connect this to the oscilloscope and verify the input signal using the horizontal and vertical readings (photo).
|Picture5.1: shows the input signal using horizontal and vertical readings|
b. Figure out how to measure the signal properties using menu buttons on the scope.
By using the measure button on the oscilloscope which is located above the vertical adjustment nobs and to the left of the auto set button. Then on the display on the right of the screen you can use the buttons for each slots to change the variable the oscilloscope will measure and what channel it will measure from.
|Picture5.2 shows where the button is located|
6. Connect function generator and oscilloscope probes switched (red to black, black to red). What happens? Why?
When we switch the connection between the probes of the function generator black and red with the probes of the oscilloscope the oscilloscope does not read anything because if we connect the red probe of the function generator to the clip of the oscilloscope the values sent from the function generator is sent to ground since the clip is the ground.
7. After calibrating the second probe, implement the voltage divider circuit below (UPDATE! V2 should be 0.5Vac and 2Vdc). Measure the following voltages using the Oscilloscope and comment on your results:
a. Va and Vb at the same time (Photo)
|Picture7.1:show signal of Va and Vb after measuring from the oscilloscope|
b. Voltage across R4.
Since the the measurement of Vb is measurement of voltage across R4 and R5, and the measurement of Va is the measurement of voltage across R5. So Vb-Va should be the measurement of voltage across R4.
8. For the same circuit above, measure Va and Vb using the handheld DMM both in AC and DC mode. What are your findings? Explain.
|Table 8.1 shows the values obtain from measuring Va &Vb using the DMM in AC & DC modes.|
Since the the 5V DC should be equally spread across the resistor which should be a DC value of 1.67V across each resistors. Va is a measurement of just one resistor so it should be close to that value which we got 1.335V and the measurement across Vb is two resistors which should be 3.406V or just double the measurement of Va so using our value of Va Vb should be 6.670V we got 2.672V.
9. For the circuit below
a. Calculate R so given voltage values are satisfied. Explain your work (video)
Video9.1: show how we found R7
b. Construct the circuit and measure the values with the DMM and oscilloscope (video). Hint: 1kΩ cannot be probed directly by the scope. But R6 and R7 are in series and it does not matter which one is connected to the function generator.
Video9.2: measuring resistance
Video9.3: measuring resistance
a. Inverting amplifier: Rin = 1kΩ, Rf = 5kΩ (do not forget -10 V and +10 V). Apply 1 Vpp @ 1kHz. Observe input and output at the same time. What happens if you slowly increase the input voltage up to 5 V? Explain your findings. (Video)
Video10.1: Explain what happens when we increase the voltage
of the voltage when we increase the voltage of the input in an inverting amplifier.
When the input value(in Blue) increases from 0.5V to 5 V, The peak to peak value will increases until it reaches its maximum value which was in our video 9.5 Vpp and then the wave of the output will round out. In our experiment we tried to increase the voltage of the input but the output value wouldn't change and Output voltage would read 5 Vrms.
b. Non-inverting amplifier: R1 = 1kΩ, R2 = 5kΩ (do not forget -10 V and +10 V). Apply 1 Vpp @ 1kHz. Observe input and output at the same time. What happens if you slowly increase the input voltage up to 5 V? Explain your findings. (Video)
Video10.2: Explain what happens when we increase the voltage
of the voltage when we increase the voltage of the input in a
it is like the inverted amplifier but in the non-inverted amplifier , the input voltage and the output voltage starts close to each other when the value is small but as the voltage increases, the output voltage increase greater and it is because the gain is higher. Until the maximum value is reached which is 9.6V, then it would round out and no matter how we increase the input value, the output voltage willn't increase.