Measure and set frequency by using an oscilloscope, Electrical Engineering

1. Introduction:

Theory: Frequency is the number of occurrences of a repeating event per unit time. It can also be defined as the number of repetitions (cycles) of a waveform that appear in a one second. It is very important to measure the frequency of a waveform passed through a circuit used in various electronic gadgets. The frequency can be measured using the oscilloscope using the formula,

F= 1 / T

Hence, if the Time period (T) gets measured, the frequency also can be calculated. Time period is defined as the duration between two adjacent repeating events.

Material Required: Oscilloscope, frequency generator, connecting wires.

Description and Aim: To measure and set frequency by using an oscilloscope.

The frequency is fed into the oscilloscope by using a generator. Hence, oscilloscope will show the frequency signal on a visual display. The oscilloscope display is adjusted so that a clear wave form is seen on the display. The time period is calculated from this waveform.

F = 1/T

2. Method:

Step 1) Use terminal ports to connect generator to DC/AC waveforms circuit block. Now, use two port connector to connect generator source to R1.

Step2) From the generator, set frequency = 1Hz roughly, and select the sine wave. To calibrate the frequency, use dial setting properly. Now, connect channel 1 probe of oscilloscope across the resistor R1. Adjust generator amplitude so that

V(R1) = Vpk-pk = 6 V

Step 3) Set time base control = 0.1 ms/div. Adjust the frequency of generator for a waveform cycle that is seven divisions wide on the horizontal axis (time axis). Measure the no of divisions on the oscilloscope display.

3. Results: (check the readings.. it shud be close to 1 hz as you have set a rough reading of 1 HZ in generator...for that you can change the no of measured time divisions to 8....also note down the unit of signals...was it mHz or Hz)

Vpk-pk = 6 V

No of time divisions for one waveform = 7

One time division = 0.1ms/div

Total time period  = 7 * 0.1 = 0.7 ms

Frequency = F = 1 / T = 1 / 0.7  = 1.42 Hz.

4. Discussion:

The frequency measured using the oscilloscope is 1.42Hz.  This frequency is close to the frequency signal from the generator as the dial was set to 1 Hz roughly. There is a difference between the two frequencies due to reasons like attenuation in the circuit components, degree of accuracy to measure width of waveform on oscilloscope (i.e. divisions in waveform), fluctuations in the generator etc. To precisely read the circuit we can set the signal more accurately in the generator using dial up knob and then measure the time period at oscilloscope.

Posted Date: 3/2/2013 12:56:11 AM | Location : United States

Related Discussions:- Measure and set frequency by using an oscilloscope, Assignment Help, Ask Question on Measure and set frequency by using an oscilloscope, Get Answer, Expert's Help, Measure and set frequency by using an oscilloscope Discussions

Write discussion on Measure and set frequency by using an oscilloscope
Your posts are moderated
Related Questions
If a television station operates on UHF channel 20 (band 506-512 MHz), determine the station's visual-carrier frequency.

Analysis in equilibrium : Solution of Poisson's Equation with suitable boundary conditions - Non-equilibrium analysis: The electron and hole densities are no longe

Q. Do as directed. a) Hexadecimal addition: 101 + ABC b) (43.25) 10-(89.75) 10 using 1's Complement c) Octal Subtraction 123-777 d) (123)6 + (435)6 = ( ? )6 e) ABC

Assuming that the receiver sends a XOFF signal when the receive buffer is P% full in order to avoid any data or packet loss.

importance of electromechanical energy conversion and device in electrical engineering

Q. Determine the Laplace transform of the waveform shown in Figure.

explain how microwave intergrated circuits differ from conventional intergrated circuit stating the technologies

Using the audiorecorder() function in MATLAB, make a recording of your voice. Use a sample rate of 8kHz, 16 bits per sample, and aim to record around 2 seconds worth. Quantize the

Q. Show a block diagram of a 4-bit, parallel-input shift-right register and briefly explain its operation.

Q. IllustrateCommon base configuration? Common base configuration: In this circuit the base is common to both input and the output.Such a configuration is also known as groun