educationElectrical maintenance and repair EEC 226

Uses and application of oscilloscope in instrumentation

USES OF CATHODE RAY OSCILLOSCOPE
(I) A.C VOLTAGE
It’s used to determine an unknown a.c voltage
(II) MEASUREMENT OF FREQUENCY.
It’s useful in determining the frequency of the waveform. A calibrated time-base is used to measure frequency.
(III) MEASUREMENT OF PHASE
It’s used to know the angular difference of two waveforms. This is done by connecting a double beam oscilloscope to measure the phase difference.
(IV) USED AS A CLOCK
In measuring frequency, the time base provides a value of time interval.
(V) COMPARISON OF FREQUENCY
When a frequency of a waveform is known, the second frequency can be known by comparing it with the first frequency.


USES OF CATHODE RAY OSCILLOSCOPE IN INSTRUMENTATION
(1) VOLTAGE MEASUREMENTS:
The parameter of voltage can be easily known using an oscilloscope
(2) CURRENT MEASUREMENT:
Currents can be measured as voltage drops across resistors, because high input impedance instrument cannot directly measure current.
To achieve this, voltage resistor will have to be earth potentially except if you want to use differential input amplifier.
(3) PHASE ANGLE MEASUREMENT
An approximate measurement of the phase angle between two voltages may be performed using the graticule of a dual trace oscilloscope to determine first, the length of a complete cycle, and then the seperation of the peaks for two voltages waveforms on the two traces.
(4) FREQUENCY MEASUREMENT
It’s useful in determining the frequency of the waveform. A calibrated time-base is used to measure frequency.

List five (5) uses of an oscilloscope in scientific and engineering application.
ANSWER

1. Measurement of AC/DC voltages
2. Amplifier gains
3. Radiation pattern of antenna
4. Modulation percentage
5. Standing wave in transmission line
6. Finding B/H curve for hysteresis loop
7. Frequency and phase determination by lissajous figures.

List three (3) uses of an oscilloscope in radio work.
1. To trace or measure a signal throughout the RF, IF and AF channels of radio tv
2. It provides the only effective way of adjusting FM receivers, broadband which frequency RF amplifiers
3. To test A.F circuits for different types of distortion and spur oscillations
4. To give visual display of Waves shapes such as sine waves, square waves and the many different combination.
5. To trace transistor curves.
6. To visually show the comLposite synchronized TV signal.
7. To display the response of tuned circuits

Oluwamuyide Peter

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