Test: Cathode Ray Oscilloscope - Electrical Engineering (EE)
10 Questions MCQ Test GATE Electrical Engineering (EE) 2024 Mock Test Series - Test: Cathode Ray Oscilloscope
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Detailed Solution for Test: Cathode Ray Oscilloscope - Question 1
Oscilloscope is a visual voltmeter with a timer that shows when a voltage changes.
Oscilloscope is defined as an electronic instrument that is used to measure and analyze electronic signals ( waves and pulses) displayed on its screen. It's functions are:
Shows and calculate the frequency and amplitude of an oscillating signal.
Shows the voltage and time of a particular signal.
Shows the content of the AC voltage or DC voltage of the signal.
When a PLL is being used as a frequency synthesizer, the output is taken from
Detailed Solution for Test: Cathode Ray Oscilloscope - Question 7
When a PLL is being used as a frequency synthesizer, the output is taken from the VCO output
A PLL is a feedback system that includes a VCO, phase detector, and low pass filter within its loop.
Its purpose is to force the VCO to replicate and track the frequency and phase at the input when in lock.
The PLL is a control system allowing one oscillator to track with another.
It is possible to have a phase offset between input and output, but when locked, the frequencies must exactly track.
For the recording of very fast random signals, the most suitable instrument would be
Detailed Solution for Test: Cathode Ray Oscilloscope - Question 9
The block diagram of a sampling oscilloscope is as shown:
The sequence of elements from trigger input to horizontal signal is (b) oscillator (d) Ramp generator (a) voltage comparator (c) staircase generator
The main function of the spectrum analyzer is to obtain the amplitude versus frequency plot from the frequency spectrum under the test.
There are two types of spectrum analyzers: scanning type and non-scanning type.
Real-time Spectrum Analyzer:
It is a non-scanning type spectrum analyzer.
A real-time spectrum analyzer is implemented to have the ability to continuously monitoring the spectrum.
The key to the real-time spectrum analyzer is that it takes successive overlapping FFT samples. and in this way, it provides a 100% probability of intercept, POI for the transient signal.
These test instruments are based around an FFT - Fast Fourier Transform spectrum analyzer. This will have a real-time - very fast - digital signal processor capable of processing the entire bandwidth with no gaps.
The real-time analyzer will use an ADC - analog to digital converter capable of digitizing the entire bandwidth of the passband.
The analyzer needs sufficient capture memory to enable continuous acquisition over the desired measurement period.
Scanning type Spectrum Analyzer or Superheterodyne Spectrum Analyzer:
The swept spectrum analyzer uses the same superheterodyne principle used in many radio receivers as the underlying principle on which its operation depends. The superheterodyne principle uses a mixer and a locally generated local oscillator signal to translate the frequency.
The signal entering the front end is translated to another frequency, typically lower in frequency(Down conversion).
Using a fixed frequency filter in the intermediate frequency section of the equipment enables high-performance filters to be used, and the analyzer or receiver input frequency can be changed by altering the frequency of the local oscillator signal entering the mixer.
The mixing principle used in the analyzer operates in exactly the same manner as it does for a superheterodyne radio.
The spectrum analyzer or sweep / swept spectrum analyzer is a form of a radio receiver with a display at the output indicating the output level. The receiver is tuned or scanned over the required range and the filters are chosen to accept the required signal bandwidth.
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