12-12-2012, 12:44 PM
DIGITAL STORAGE OSCILLOSCOPE
[attachment=43494]
INTRODUCTION
An oscilloscope is an electronic device used to analyze or display the waveform of electronic signal.
A graph-displaying device of electrical signal
X axis: Time
Y axis: Voltage
Z axis: Intensity or brightness
Information given by oscilloscope
Time and voltage
Frequency and phase
DC and AC components
Spectral analysis
Rise and fall time
Mathematical analysis
Analog oscilloscope
As the name implies it uses analogue techniques throughout to create the pattern on the display. Typically they use a cathode ray tube where the voltages on the x and y plats cause a dot on the screen to move. In the horizontal direction this is controlled by the time base, whereas in the vertical direction the deflection is proportional to the signal input.
Digital Oscilloscope
The concept behind the digital oscilloscope is somewhat different to an analogue scope. Rather than processing the signals in an analogue fashion, the scope converts them into a digital format using an analogue to digital converter and then processes the signals digitally and then may convert them into an analogue format again for them to be displayed.
WORKING
The analogue signal being monitored is fed into a pre amp, which changes it’s amplitude so that it falls within the input range of the Analogue to digital converter (ADC) and the trigger detector.
When the resulting voltage crosses a threshold set by user the trigger unit signal the device to start recording.
Output of the Pre-Amplifier is given to the ADC which convert Analogue signal into Digital signal and output of ADC is store in the memory.
When the memory is full recording is stopped.
Output of the memory and control logic is given to the Digital To Analogue Converter(DAC) which Covert digital signal into analogue form.
Output of DAC block is given to the CRT which display the waveform.
ADVANTAGE
In the DSO we have store the 15 wave form in internal memory.
The most reliable advantage of a DSO is that it stores the signal in digital form so prevents degradation.
Easy to use.
Triggering.
Peak detection.
Also slow traces like the temperature variation across a day can be recorded.
Allows for automation.
DISADVANTAGE
Disadvantage of a DSO is that due to the use of ADC and some other extra components it is costly as compared to analog oscilloscopes
[attachment=43494]
INTRODUCTION
An oscilloscope is an electronic device used to analyze or display the waveform of electronic signal.
A graph-displaying device of electrical signal
X axis: Time
Y axis: Voltage
Z axis: Intensity or brightness
Information given by oscilloscope
Time and voltage
Frequency and phase
DC and AC components
Spectral analysis
Rise and fall time
Mathematical analysis
Analog oscilloscope
As the name implies it uses analogue techniques throughout to create the pattern on the display. Typically they use a cathode ray tube where the voltages on the x and y plats cause a dot on the screen to move. In the horizontal direction this is controlled by the time base, whereas in the vertical direction the deflection is proportional to the signal input.
Digital Oscilloscope
The concept behind the digital oscilloscope is somewhat different to an analogue scope. Rather than processing the signals in an analogue fashion, the scope converts them into a digital format using an analogue to digital converter and then processes the signals digitally and then may convert them into an analogue format again for them to be displayed.
WORKING
The analogue signal being monitored is fed into a pre amp, which changes it’s amplitude so that it falls within the input range of the Analogue to digital converter (ADC) and the trigger detector.
When the resulting voltage crosses a threshold set by user the trigger unit signal the device to start recording.
Output of the Pre-Amplifier is given to the ADC which convert Analogue signal into Digital signal and output of ADC is store in the memory.
When the memory is full recording is stopped.
Output of the memory and control logic is given to the Digital To Analogue Converter(DAC) which Covert digital signal into analogue form.
Output of DAC block is given to the CRT which display the waveform.
ADVANTAGE
In the DSO we have store the 15 wave form in internal memory.
The most reliable advantage of a DSO is that it stores the signal in digital form so prevents degradation.
Easy to use.
Triggering.
Peak detection.
Also slow traces like the temperature variation across a day can be recorded.
Allows for automation.
DISADVANTAGE
Disadvantage of a DSO is that due to the use of ADC and some other extra components it is costly as compared to analog oscilloscopes