Practices with the Oscilloscope
As first practice in GOING, we are going to see the operation basic and applied to the radio communications. We must understand that the analytical one of the signal is very important to see its basic parameters. The oscilloscope is a visualization and measuring instrument of the electrical signals. We have a brief manual in youtube that we will begin to see it soon to happen to make some tasks with the same
We have a good tutorial that we are going to see before following with the Good https://www.electronicafacil.net/tutoriales/Uso-del-osciloscopio.php tasks, we happened to the tasks
1º Vamos to calibrate our oscilloscope.
First that we must do it is a calibration of the sounding that we used in the measures. The sounding usually has a commutator of X1 (enters the signal so what) and X10 (it reduces to the signal 10 times). We put in X1 and with the sounding we looked for the exit that the own oscilloscope must to calibrate it.
Following the model it can give to a signal of 0,5 volts tip to tip, 2 Vpp, etc.
The frequency of the signal of that generating intern usually is on 1 KH
Fitting to the base of times and the vertical scale we must obtain a perfect square signal. If it is not it, we fit the sounding with a screwdriver until obtaining totally straight the horizontal lines.
In the first case, we have a perfect signal (square). We must try to obtain a signal but the similar thing to her. Perhaps we are with 2º signal (little compensated) or 3ª signal, that it would excessively be compensated.
The first practice consists of making screenshot of the viewfinder of the oscilloscope where it is how it is the squared signal, once fit in the sounding
2º Practices with the Proteus simulator. He is a group of several practices only simulated.
In the folder of DRIVE and with the name you practice/oscilloscope, we have several practices to practice with our simulator. IMPORTANT. Each activity that becomes must be reflected in the memory with a screenshot and description of the activity.
2.1 First of all, to do regarding the condenser. In this case, only we are going it to simulate with proteus.
To mount the circuit with the given values that we have actually. To visualize the signal and to make screenshot of the load and unload.
To measure the time τ and to compare it with τ theoretical 2.3.
To calculate R of load so that τ is of the double. To replace in proteus and to visualize the signal of load and unloading 2,4 In document pdf to give, we must locate the signals of entrance and the two of load and unloading
Actually of the diodes we have a document of theory on the operation of the diode and typical circuits to work as rectifier of average wave and complete wave.
3.1 Montar in proteus the circuit where we took values from Tension and current of the diode. To pass the values to the table that appears in drive (excel).
When adding the values, will be the characteristic line of the diode.
3.2 Montar a circuit of average wave. To take the tensions to the entrance and when coming out to verify the difference
3.3 Montar both circuits of complete wave (one with transformer and other that has 4 diodes). To take the tensions to the entrance and exit
3.4 In some of the smoothing circuits, to put in parallel a diode so that the exit tension is but smooth (we reduce the tension of curly)
To fit our circuit with the values of fo, R, L and C to verify that the tension in the coil is equal to the tension of the condenser (in resonance). To verify that Fo leaves 40412 Hertz, approx, when we applied the formula:
You practice of Filters. Simulation in proteus
The radioelectric space is made up of an ample variety of signals of RF, each with its corresponding frequency. The filters are circuits that are going to prevent the passage of certain frequencies and is going to let pass the frequencies that interest to us.
This objetito can be made with components liabilities (R, L, C) or with active components (transistors, op amps, etc). These last ones are more necessary.
To the left of the image, we have a simple filter made up of a resistance and a condenser.
Knowing the answer of the condenser to the frequency, what you think that it is going to let pass, the low frequencies or high?
Development of the practices. Until we do not make the three tasks, not to raise it Drive. As always, in a pdf, with the name of Filtros.pdf
Finally, to verify that the value of the cutoff frequency agrees with the given one in the graph. Double click in the green bar becomes and it becomes but great
Theory. Now it is called on to us “to unite” both previous filters to secure the two functions (to let pass the losses and the discharges).
The idea is that if the low one lets pass until certain Fcs frequency and the stop lets pass from a frequency the ICF, the result is that pass the frequencies from the ICF to Fcs.
We are going to design a circuit that lets pass a rank of frequencies (the ICF of 1000Hz and one fcs of 10kHz. We must consider the impedances of entrance and exit of the filter. We suppose that the sign source (Entered) has an impedance of 50Ω and that connects to a load 47kΩ.
We come to mount our circuit in proteus.
Task to realise. To come to design a band-pass filter where the impedance of the load is 60 KΩ and kHz and 80 the 50 cutoff frequencies they are KHz. One is due to indicate each one of the steps, as well as to add the explanatory images of the practice