Digital Storage Oscilloscope MCQ || Digital Storage Oscilloscope Questions and Answers

Answer.1. 3 modes

Explanation: 

The digital storage oscilloscope has 3 modes of operation:

1. Roll Mode: This is used to observe the fast varying signal.
2. Store Mode: It is called refresh mode and is most commonly used.
3. Hold or Save Mode: This mode is also the commonly used mode.

Answer.3. Digital storage Oscilloscope

Explanation: 

• A digital storage oscilloscope stores the captured input signal in a digital mode and displays the signal without further processing.
• Most digital oscilloscopes can also be switched between the digital and analog modes.
• Digital oscilloscopes have many desirable features.
• They will be more widely used as their cost becomes more competitive or as a part of a data acquisition system.

Answer.3. Role Mode

Explanation: 

In Digital storage Oscilloscope roll mode is a method of displaying acquired waveform data without waiting for the complete waveform record.

Roll mode is the most basic mode of operation which is similar to that of a general-purpose CRO. When an input is applied, the trace is displayed on the screen. A user can use this mode to keep an eye on the waveform and its various characteristics.

Answer.1. Store Mode

Explanation: 

• In Digital storage Oscilloscope store mode is otherwise called refresh mode.
• In this mode, the input initiates the trigger circuit. This initiates the memory write cycle.
• The digital data is transferred to the memory when the memory is full, the write cycle stops.
• Here, using DAC, the memory data is converted to analog and then displayed on the screen when the next trigger across the memory is refreshed.

Answer.4. Unlimited

Explanation: 

Digital storage oscilloscopes use digital memory where the data are stored and hence the storage time is virtually unlimited.

The memory can store data as long as required without degradation. It also allows the complex processing of the signal by the high-speed digital signal processing circuits.

Answer.4. Microprocessor

Explanation: 

• In the Digital storage oscilloscope, the input signal is applied to the amplifier and attenuator section.
• The oscilloscope uses the same type of amplifier and attenuator circuitry as used in conventional oscilloscopes.
• The attenuated signal is then applied to the vertical amplifier.
• The vertical input, after passing through the vertical amplifier, is digitized by an analog to digital converter to create a data set that is stored in the memory.
• The data set is processed by the microprocessor & then sent to the display.

Answer.2. Hold Mode

Explanation: 

• In Digital storage, Oscilloscope hold is otherwise called save mode.
• When a new sweep signal is generated by a time base generator, the old contents get overwritten by the new one.
• If a particular signal is to be stored then by processing the hold or save button, overwriting can be stopped and the previously saved signal is locked

Answer.3. Digital form

Explanation: 

• In this digital storage oscilloscope, the waveform to be stored is digitized and then stored in digital memory.
• The digital storage oscilloscope eliminates the disadvantages of the analog storage oscilloscope.
• It replaces the unreliable storage method used in analog storage oscilloscopes with digital storage with the help of memory.
• The memory can store data as long as required without degradation. It also allows the complex processing of the signal by the high-speed digital signal processing circuits.

Answer.4. All of the above

Explanation: 

• Digital oscilloscopes usually analyze waveforms and provide numerical values as well as visual displays.
• These values typically include averages, maxima and minima, root mean square (RMS) and frequencies.
• They may be used to capture transient signals when operated in a single sweep mode, without the brightness and writing speed limitations of an oscilloscope.

Answer.4. Conventional

Explanation: 

The conventional cathode ray tube is used in this oscilloscope hence the cost is less. The power to be applied to memory is small and can be supplied by a small battery.

Due to this, the stored image can be displayed indefinitely as long as power is supplied to memory. Once the waveform is digitized then it can be further loaded into the computer & can be analyzed in detail.

Answer.4. 100000 samples/sec

Explanation: 

• Digitizing the analog input signal means taking samples at periodic intervals of the input signal.
• The rate of sampling should be at least twice as fast as the highest frequency present in the input signal. This ensures no loss of information.
• The sampling rates as high as 100,000 samples per second are used. This requires a very fast conversion rate of an A/D converter.

Answer.1. Low

Explanation: 

The conventional cathode ray tube is used in this oscilloscope hence the cost is less. The power to be applied to memory is low and can be supplied by a small battery.

Due to this, the stored image can be displayed indefinitely as long as power is supplied to memory. Once the waveform is digitized then it can be further loaded into the computer & can be analyzed in detail.

Answer.3. A/D converter

Explanation: 

• To digitize the analog signal, an analog to digital (A/D) converter is used.
• The output of the vertical amplifier is applied to the A/D converter section.
• The main requirement of an A/D converter in the digital storage oscilloscope is its speed, while in digital voltameters accuracy and resolution were the main requirements.
• The digitized output is needed only in the binary form and not in BCD.
• The successive approximation type of A/D converter is used in the digital storage oscilloscopes.

Answer.4. All of the above

Explanation: 

The advantages of digital storage oscilloscopes are as follows

• The storage time is infinite.
• It can be easily operated and has more capability.
• Digital storage oscilloscope allows flexible display property.
• The cursor measurement is possible.
• The X-Y plots, B-H curve, P-V diagrams can be displayed

Answer.4. All of the above

Explanation: 

The applications of digital storage oscilloscopes are as follows:

• It is used in audio and video recording.
• It is used in radio broadcasting for signal testing.
• In circuit debugging, it is used for testing the voltage of the signal.
• The measurement of various AC parameters such as current, voltages, etc.
• It is used to measure slow-moving parameters such as the temperature of the day.
• It can be used to measure A.C. as well as D.C. voltages and currents, Frequency, time period, time interval between two signals, etc.
• It is used to give the visual representation for a target of radar such as aeroplane, ship etc.
• In medical fields, it is used to display cardiograms that are useful for the diagnosis of the heart of the patient.