4.4 overview of digital storage oscilloscope
4.4 overview of digital storage oscilloscope
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What is a Digital Storage Oscilloscope?
A digital storage oscilloscope, also known as a DSO, is an electronic device that is capable of storing a digital copy of the measured waveform. Using analog-to-digital converters to digitize and sample measured voltages, a digital storage oscilloscope stores the results in its memory, which it process further using digital signal processing techniques.
Advantages of Digital Storage
Oscilloscope
They allow long-term display of a transient quantity.
◦It is easy to produce a hard copy of the display.
◦They allow computation and signal processing within the DSO.
◦They allow easy transfer of data to a computer.
◦They use cheap cathode-ray-tube construction because the deflection is not at signal frequency but much lower than the maximum signal frequency.
How the Digital Oscilloscope work?
◦ The maximum frequency measured on the digital signal oscilloscope depends upon two things they are:
1. 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.
2. 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 difference between DSO and CRO
Digital Storage Oscilloscope
Digital Storage Oscilloscope
◦ DSO is a digital oscilloscope. DSO stores and analyzes the signals digitally.
◦ Digital Storage Oscilloscope has an advanced triggering circuit.
◦ Digital Storage Oscilloscope has memory.
◦ The computers and printer is attached using a USB port.
◦ It is more stable and accurate because the time base is generated by a crystal clock.
◦ DSO measures and displays all properties of the waveform.
Cathode-Ray Oscilloscope
Cathode-Ray Oscilloscope
◦ CRO is an analog oscilloscope, and it cannot store signals.
◦ Cathode Ray Oscilloscope used a normal triggering circuit.
◦ Simple Cathode Ray Oscilloscope does not have any memory.
◦ Computers and printers don’t attach because it doesn’t have USB.
◦ It is less stable and accurate because the time base is generated by the ramp circuit.
◦ CRO measures but doesn’t display the properties.
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