Explain Digital Storage Oscilloscope with Block Diagram | New Topic

In this note, we will explain Digital Storage Oscilloscope with Block Diagram. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering notes.

Author Name: Arun Paul.

What is Digital Storage Oscilloscope or DSO?

A digital storage oscilloscope (DSO) is a type of electronic test tool that visualizes and analyzes digital electrical signals. Unlike analog oscilloscopes, which employ continuous waveforms, DSOs convert incoming signals into digital data and store it in memory for further processing and display.

Specifications of Digital Storage Oscilloscope

• The bandwidth ranges from a few MHz to several GHz.
• The sampling rate is measured in S/s (Samples per Second), typically in MS/s or GS/s.
• The vertical resolution is usually 8 to 16 bits for amplitude precision.
• Triggering modes includes edge, pulse, video, and advanced triggers.
• Input Impedance is typically 1MΩ or 50Ω for signal compatibility.
• The number of channels is generally 2 to 4, but higher-end models have more.
• The display type and resolution is LCD/TFT screens.
• The connectivity type is USB, LAN, GPIB for data transfer and remote control.
• It is operates on AC or battery, depending on the model.

Precautions for Handling a Digital Storage Oscilloscope (DSO)

• Electrical Safety – Use a grounded power source and check voltage ratings.
• Probe Handling – Use correct probes, connect the ground first, and avoid touching tips.
• Environment – Keep it dry, dust-free, and well-ventilated.
• Calibration & Maintenance – Regularly calibrate, clean, and store properly.
• Input Protection – Avoid exceeding voltage limits; use attenuators if needed.
• Firmware Updates – Keep software and firmware updated.
• Storage & Transport – Turn off before unplugging, store securely, and use a case when transporting.

Explain Digital Storage Oscilloscope with Block Diagram

Here is the Digital Storage Oscilloscope block diagram and working principle

The input attenuator reduces the amplitude of the input signal to within the oscilloscope’s working range. After attenuation, the signal is routed via a vertical amplifier, which amplifies it to a level appropriate for processing. The sample and hold circuit takes and stores the signal at predetermined time intervals, assuring stability for the Analog-to-Digital Converter (ADC), which then converts the analog signal to digital format.

The trigger circuit synchronizes the waveform display by guaranteeing that data acquisition begins at a predetermined point, resulting in a consistent portrayal of periodic signals. The control logic coordinates numerous operations, such as data sampling, storage, and display processing. The memory maintains both the digitized signal and time-related information, allowing the waveform to be retrieved, processed, and analyzed as needed.

The waveform is displayed by converting the stored digital data back into an analog signal using Digital-to-Analog Converters (D/A). The vertical deflection amplifier moves the waveform vertically on the display to depict signal amplitude, whereas the horizontal deflection amplifier moves the waveform horizontally based on the time basis settings. The processed waveform is then shown on a Cathode Ray Tube (CRT), allowing a visual representation of the input signal. In addition, the data out option transfers waveform data to external devices for further study.

Digital Storage Oscilloscope Advantages

Here are the advantages of digital storage oscilloscope –

• High accuracy and precision.
• Ability to store and retrieve waveforms.
• Easier signal analysis with advanced software tools.
• Digital display with color-coded waveforms for better visualization.

Digital Storage Oscilloscope Applications

Here are some applications of digital storage oscilloscope –

• Circuit debugging and troubleshooting.
• Signal integrity analysis in electronics.
• Testing and validating embedded systems.
• Research and development in electrical engineering.

Analog Oscilloscope Vs Digital Oscilloscope

Here are some differences between analog and digital oscilloscope –