How to use an oscilloscope build electronic circuits. The topics range from introductory rl and rc circuits and oscilloscope orientation through seriesparallel circuits. You will view the voltage drop over the various elements of the circuit with the oscilloscope. Your observation from oscilloscope is same as what you have seen from bode analyzer. Recently, using simulation software, i used an oscilloscope to calculate the resonant frequency of the circuit, by measuring the sine wave of the resistor.
Swift 16671745 objective to learn to operate a cathode ray oscilloscope. Rlc circuit in this tutorial, we will build and simulate an rlc circuit. Theory the oscilloscope, or scope for short, is a device for drawing calibrated graphs of voltage vs time very quickly and conveniently. Figure 1 shows a parallel rlc circuit with a current source and switch. To experimentally determine the resonance frequency in a series rlc circuit and compare this to the expected resonance value.
The oscilloscope is arguably one of the most useful general purpose tools ever created for use by electronic engineers. The oscilloscope is an instrument that measures voltage over time. Oscilloscope lexicon learning how to use an oscilloscope means being introduced to an entire lexicon of terms. I used the equation 1t, with t being the time period between the start of the wave and. Study the steadystate dc and transient rl and rc responses. Ece 2006 university of minnesota duluth lab 11 ece department page 4 figure 3. Measure capacitors and inductors with an oscilloscope and some basic parts. No substitute for a professional oscilloscope by far but still could be a fun project to have a go at probably the best advantage is its very small size and the fact that it can run off the power supply of the circuit being tested.
Learn how to connect probes to various test points in a circuit. The period t of the oscilloscope must be in the region. The oscilloscope will always reset to the previous settings the settings that were on the oscilloscope when it was turned o. When your circuit is not working, it will help you figure out what is going on. Recurrent surge oscillograph rso for rotor winding shorts detection p. To see how the oscillation amplitude of a series rlc circuit depends upon the driving frequency and exhibits resonance at a particular frequency. Disconnect ch2 from the circuit and connect it to point a as shown in figure 2b. Construct the circuit shown in figure 1 using the following components. Identifying the shape of a wave sine, square, triangle, sawtooth, complex, etc. On the oscilloscope the vg waveform channel 2 should move to the left relative to the stationary vr waveform channel 1. Such an instrument is obviously useful for the design and.
I was told that it is incorrect to measure the dc voltage across a circuit element using an oscilloscope by putting the probe on one side and the ground clip on the other. Rc circuits and the oscilloscope physics lab x objective in this series of experiments, the time constant of an rc circuit will be measured experimentally and compared with the theoretical expression for it. The oscilloscope vision is the art of seeing things invisible. Why is it wrong to connect an oscilloscope in parallel.
Discharge of a capacitor procedure y assemble the circuit shown in figure 5 function generator. You may see this rlc circuit is a band pass filter, the gain change with different frequency. Frequency response of rlc resonance circuit, from eq. Try changing the amplitude and repetition frequency of the generator and observe. Because sound cards have different internal resistances, the values to use in the circuit above varies. Oscillation and damping in the lrc circuit 1 experiment 2. Using a x10 probe with the oscilloscope, measure the voltage spike.
It is recommended you complete tutorials 1 and 2 before starting. Rl and rc circuits and signals montana state university. To learn how to operate the oscilloscope and function generator, set the function generator for square wave output. One problem is the failure to predict the inductance of a circuit based on the critical resistance variation with capacitance, although the problem could lie. Change the frequency from function generator, and observe the amplitude change of channel b on oscilloscope. Be able to determine the step responses of parallel and series rlc circuits 3.
The voltage v r measured across the resistor of the rlc series circuit are predicted to look like this. Oscilloscope connection for alternating current circuit. Describe the different types of probes and their uses. Repeat the experiment using for the series resonant circuit in figure 3, and use l1 20 mh and c1 0. Understand the basic characteristics of an oscilloscope probe. Public circuits, schematics, and circuit simulations on circuitlab tagged oscilloscope. Experiment 10 rlc series circuit resonance in an rlc series circuit objective.
This manual is intended for use in an ac electrical circuits course and is appropriate for either a two or. The circuit should reach steady state very quickly, in much. Additionally a tektronix tds3012b oscilloscope with serial number f28819 was used to measure the transient response in all parts. This also means that you wont know the voltage level of the signal unless you also build a tuning circuit. This is a keypad circuit that will convert the decimal value of any keypad switch into its bcd equivalent. R1 10 k r2 1 k vin 5 v dc the oscilloscope is a useful instrument for studying the behavior of an electronic circuit. Rlc circuit given v s is a phasor of 5 volts rms and 0 degrees of phase angle chosen as the reference phasor, calculate the resonant frequency, f0, and find the impedance of the circuit as seen by the source for each of the frequencies in table 1. Introduction to oscilloscope probes lab experiment laboratory experiment introduction objectives 1. Introduction to the oscilloscope and rc circuits introduction this experiment will lead you through the steps on using an oscilloscope to measure the output of a dc power supply and the output of a function generator and then to utilize the oscilloscope to measure the time dependent properties of a simple rc circuit. Set the scope up to get a single trace for channel 1. In the process of understanding the underlying physics. Rc, rl and rlc circuits 2 procedure to learn how to operate the oscilloscope and function generator, set the function generator for square wave output and connect the generator to the vertical input of the oscilloscope. An oscilloscope is an electronic test instrument that displays electrical signals graphically, usually as a.
Although it has a low frequency range, it can still be used for most circuits. The rules for series and parallel combinations of resistors and capacitors will also be explored. Oscilloscope basics guide a guide to oscilloscope operation, architecture and. Circuitlab is an inbrowser schematic capture and circuit simulation software tool to help you rapidly design and. Oscillation and damping in the lrc circuit introduction in this laboratory you will construct an lrc series circuit and apply a constant voltage over it.
This experiment describes the oscilloscope and illustrates its use with several exercises involving series rc, rl, rlc circuits plus an electrical relay. Chapter 21 2 voltage and current in rlc circuits iac emf source. Be able to determine the responses both natural and transient of second order circuits with op amps. Understanding resonant frequency in a series rlc circuit. Quantifying phase differences between two different signals. Rc circuits and the oscilloscope mercer university. Recurrent surge oscillograph rso for rotor winding. Change the settings to obtain the signal as in procedure 56. Phase and impedance in an rlc circuit 1 phase and impedance in an rlc circuit objective the purpose of this experiment is to introduce you to some of the phenomena and terminology of ac circuits involving resistance, inductance, and capacitance.
Since its invention more than 100 years ago, new types, features and functionalities have been introduced. Davis, adam di carlo, mark kahrs, andrew mayrs, cliff schuring, and john shriver for assistance in compiling this information. Figure 1 shows a driven rlc circuit where vo is the applied sinusoidal voltage from the function generator and v is the voltage measured across the resistor using an oscilloscope. You can see that easily wit the oscilloscope application. Learning how to use an oscilloscope means being introduced to an entire lexicon of terms. The voltage through an rlc series circuit will be measured as a function of frequency for a fixed applied voltage. Ii etude du circuit rlc pour une frequence f du gbf.
On this page well introduce some of the important oscope buzzwords you should be familiar with before turning one on. Why is it wrong to connect an oscilloscope in parallel with a circuit element. In making measurements you will use the digital storage oscilloscope and signal generator. The series rlc resonance circuit introduction thus far we have studied a circuit involving a 1 series resistor r and capacitor c circuit as well as a 2 series resistor r and inductor l circuit. Here, he explains all the steps of building a cheap. Steve garratt has written an excellent book called sound card oscilloscope. In both cases, it was simpler for the actual experiment to replace the battery and switch with a signal generator producing a square wave. Knowing how to use an oscilloscope is very useful when building electronic circuits. The oscilloscope is now connected in parallel to the inductor to measure its voltage. Qrp checkin to norcars net from rvrc hamfest june 19, 2010. Adjust the oscilloscope to obtain each of the patterns shown in figure 3.
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