Page 1
Definition: The digital storage oscilloscope is defined as the
oscilloscope which stores and analysis the signal digitally, i.e. in
the form of 1 or 0 preferably storing them as analogue signals. The
digital oscilloscope takes an input signal, store them and then display it
on the screen. The digital oscilloscope has advanced features of
storage, triggering and measurement. Also, it displays the
signal visually as well as numerically.
Working Principle of Digital Storage Oscilloscope
The digital oscilloscope digitises and stores the input signal. This can
be done by the use of CR y a R e d o h t a C ( T ) e b u T and digital memory.
The block diagram of the basic digital oscilloscope is shown in the
figure below. The digitisation can be done by taking the sample input
signals at periodic waveforms.
The maximum frequency of the signal which is measured by the digital
oscilloscope depends on the two factors. Theses factors are the
1. Sampling rate
2. Nature of converter.
Page 2
Definition: The digital storage oscilloscope is defined as the
oscilloscope which stores and analysis the signal digitally, i.e. in
the form of 1 or 0 preferably storing them as analogue signals. The
digital oscilloscope takes an input signal, store them and then display it
on the screen. The digital oscilloscope has advanced features of
storage, triggering and measurement. Also, it displays the
signal visually as well as numerically.
Working Principle of Digital Storage Oscilloscope
The digital oscilloscope digitises and stores the input signal. This can
be done by the use of CR y a R e d o h t a C ( T ) e b u T and digital memory.
The block diagram of the basic digital oscilloscope is shown in the
figure below. The digitisation can be done by taking the sample input
signals at periodic waveforms.
The maximum frequency of the signal which is measured by the digital
oscilloscope depends on the two factors. Theses factors are the
1. Sampling rate
2. Nature of converter.
Sampling Rate – For safe analysis of input signal the sampling theory
is used. The sampling theory states that the sampling rate of the signal
must be twice as fast as the highest frequency of the input signal. The
sampling rate means analogue to digital converter has a high fast
conversion rate.
Converter – The converter uses the expensive flash whose resolution
decreases with the increases of a sampling rate. Because of the
sampling rate, the bandwidth and resolution of the oscilloscope are
limited.
The need of the analogue to digital signal converters can also be
overcome by using the shift register. The input signal is sampled and
stored in the shift register. From the shift register, the signal is slowly
read out and stored in the digital form. This method reduces the cost
of the converter and operates up to 100 megasample per second.
The only disadvantage of the digital oscilloscope is that it does not
accept the data during digitisation, so it had a blind spot at that time.
Waveform Reconstruction
For visualising the final wave, the oscilloscopes use the technique of
inter-polarization. The inter-polarization is the process of creating the
new data points with the help of known variable data points. Linear
interpolation and sinusoidal interpolation are the two processes of
connecting the points together.
Page 3
Definition: The digital storage oscilloscope is defined as the
oscilloscope which stores and analysis the signal digitally, i.e. in
the form of 1 or 0 preferably storing them as analogue signals. The
digital oscilloscope takes an input signal, store them and then display it
on the screen. The digital oscilloscope has advanced features of
storage, triggering and measurement. Also, it displays the
signal visually as well as numerically.
Working Principle of Digital Storage Oscilloscope
The digital oscilloscope digitises and stores the input signal. This can
be done by the use of CR y a R e d o h t a C ( T ) e b u T and digital memory.
The block diagram of the basic digital oscilloscope is shown in the
figure below. The digitisation can be done by taking the sample input
signals at periodic waveforms.
The maximum frequency of the signal which is measured by the digital
oscilloscope depends on the two factors. Theses factors are the
1. Sampling rate
2. Nature of converter.
Sampling Rate – For safe analysis of input signal the sampling theory
is used. The sampling theory states that the sampling rate of the signal
must be twice as fast as the highest frequency of the input signal. The
sampling rate means analogue to digital converter has a high fast
conversion rate.
Converter – The converter uses the expensive flash whose resolution
decreases with the increases of a sampling rate. Because of the
sampling rate, the bandwidth and resolution of the oscilloscope are
limited.
The need of the analogue to digital signal converters can also be
overcome by using the shift register. The input signal is sampled and
stored in the shift register. From the shift register, the signal is slowly
read out and stored in the digital form. This method reduces the cost
of the converter and operates up to 100 megasample per second.
The only disadvantage of the digital oscilloscope is that it does not
accept the data during digitisation, so it had a blind spot at that time.
Waveform Reconstruction
For visualising the final wave, the oscilloscopes use the technique of
inter-polarization. The inter-polarization is the process of creating the
new data points with the help of known variable data points. Linear
interpolation and sinusoidal interpolation are the two processes of
connecting the points together.
In interpolation, the lines are used for connecting the dot together.
Linear interpolation is also used for creating the pulsed or square
waveform. For sine waveform, the sinusoidal interpolation is utilised in
the oscilloscope.
Applications
The applications of the DSO are
• It checks faulty components in circuits
• Used in the medical field
• Used to measure capacitor, inductance, time interval between
signals, frequency and time period
• Used to observe transistors and diodes V-I characteristics
• Used to analyze TV waveforms
Page 4
Definition: The digital storage oscilloscope is defined as the
oscilloscope which stores and analysis the signal digitally, i.e. in
the form of 1 or 0 preferably storing them as analogue signals. The
digital oscilloscope takes an input signal, store them and then display it
on the screen. The digital oscilloscope has advanced features of
storage, triggering and measurement. Also, it displays the
signal visually as well as numerically.
Working Principle of Digital Storage Oscilloscope
The digital oscilloscope digitises and stores the input signal. This can
be done by the use of CR y a R e d o h t a C ( T ) e b u T and digital memory.
The block diagram of the basic digital oscilloscope is shown in the
figure below. The digitisation can be done by taking the sample input
signals at periodic waveforms.
The maximum frequency of the signal which is measured by the digital
oscilloscope depends on the two factors. Theses factors are the
1. Sampling rate
2. Nature of converter.
Sampling Rate – For safe analysis of input signal the sampling theory
is used. The sampling theory states that the sampling rate of the signal
must be twice as fast as the highest frequency of the input signal. The
sampling rate means analogue to digital converter has a high fast
conversion rate.
Converter – The converter uses the expensive flash whose resolution
decreases with the increases of a sampling rate. Because of the
sampling rate, the bandwidth and resolution of the oscilloscope are
limited.
The need of the analogue to digital signal converters can also be
overcome by using the shift register. The input signal is sampled and
stored in the shift register. From the shift register, the signal is slowly
read out and stored in the digital form. This method reduces the cost
of the converter and operates up to 100 megasample per second.
The only disadvantage of the digital oscilloscope is that it does not
accept the data during digitisation, so it had a blind spot at that time.
Waveform Reconstruction
For visualising the final wave, the oscilloscopes use the technique of
inter-polarization. The inter-polarization is the process of creating the
new data points with the help of known variable data points. Linear
interpolation and sinusoidal interpolation are the two processes of
connecting the points together.
In interpolation, the lines are used for connecting the dot together.
Linear interpolation is also used for creating the pulsed or square
waveform. For sine waveform, the sinusoidal interpolation is utilised in
the oscilloscope.
Applications
The applications of the DSO are
• It checks faulty components in circuits
• Used in the medical field
• Used to measure capacitor, inductance, time interval between
signals, frequency and time period
• Used to observe transistors and diodes V-I characteristics
• Used to analyze TV waveforms
• Used in video and audio recording equipment’s
• Used in designing
• Used in the research field
• For comparison purpose, it displays 3D figure or multiple
waveforms
• It is widely used an oscilloscope
Advantages
The advantages of the DSO are
• Portable
• Have the highest bandwidth
• The user interface is simple
• Speed is high
Disadvantages
The disadvantages of the DSO are
• Complex
• High cost
Page 5
Definition: The digital storage oscilloscope is defined as the
oscilloscope which stores and analysis the signal digitally, i.e. in
the form of 1 or 0 preferably storing them as analogue signals. The
digital oscilloscope takes an input signal, store them and then display it
on the screen. The digital oscilloscope has advanced features of
storage, triggering and measurement. Also, it displays the
signal visually as well as numerically.
Working Principle of Digital Storage Oscilloscope
The digital oscilloscope digitises and stores the input signal. This can
be done by the use of CR y a R e d o h t a C ( T ) e b u T and digital memory.
The block diagram of the basic digital oscilloscope is shown in the
figure below. The digitisation can be done by taking the sample input
signals at periodic waveforms.
The maximum frequency of the signal which is measured by the digital
oscilloscope depends on the two factors. Theses factors are the
1. Sampling rate
2. Nature of converter.
Sampling Rate – For safe analysis of input signal the sampling theory
is used. The sampling theory states that the sampling rate of the signal
must be twice as fast as the highest frequency of the input signal. The
sampling rate means analogue to digital converter has a high fast
conversion rate.
Converter – The converter uses the expensive flash whose resolution
decreases with the increases of a sampling rate. Because of the
sampling rate, the bandwidth and resolution of the oscilloscope are
limited.
The need of the analogue to digital signal converters can also be
overcome by using the shift register. The input signal is sampled and
stored in the shift register. From the shift register, the signal is slowly
read out and stored in the digital form. This method reduces the cost
of the converter and operates up to 100 megasample per second.
The only disadvantage of the digital oscilloscope is that it does not
accept the data during digitisation, so it had a blind spot at that time.
Waveform Reconstruction
For visualising the final wave, the oscilloscopes use the technique of
inter-polarization. The inter-polarization is the process of creating the
new data points with the help of known variable data points. Linear
interpolation and sinusoidal interpolation are the two processes of
connecting the points together.
In interpolation, the lines are used for connecting the dot together.
Linear interpolation is also used for creating the pulsed or square
waveform. For sine waveform, the sinusoidal interpolation is utilised in
the oscilloscope.
Applications
The applications of the DSO are
• It checks faulty components in circuits
• Used in the medical field
• Used to measure capacitor, inductance, time interval between
signals, frequency and time period
• Used to observe transistors and diodes V-I characteristics
• Used to analyze TV waveforms
• Used in video and audio recording equipment’s
• Used in designing
• Used in the research field
• For comparison purpose, it displays 3D figure or multiple
waveforms
• It is widely used an oscilloscope
Advantages
The advantages of the DSO are
• Portable
• Have the highest bandwidth
• The user interface is simple
• Speed is high
Disadvantages
The disadvantages of the DSO are
• Complex
• High cost
CRO Probes
We can connect any test circuit to an oscilloscope through a probe. As
CRO is a basic oscilloscope, the probe which is connected to it is also
called CRO probe.
We should select the probe in such a way that it should not create any
loading issues with the test circuit. So that we can analyze the test circuit
with the signals properly on CRO screen.
CRO probes should have the following characteristics.
• High impedance
• High bandwidth
The block diagram of CRO probe is shown in below figure.
As shown in the figure, CRO probe mainly consists of three blocks. Those
are probe head, co-axial cable and termination circuit. Co-axial cable
simply connects the probe head and termination circuit.
Types of CRO Probes
CRO probes can be classified into the following two types.
• Passive Probes
• Active Probes
Now, let us discuss about these two types of probes one by one.
Passive Probes
If the probe head consists of passive elements, then it is called passive
probe. The circuit diagram of passive probe is shown in below figure.
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