The DSO138 Mini Oscilloscope is a compact, reliable, and fully assembled digital oscilloscope designed for electronics learning, testing, debugging, and basic signal analysis. This version comes fully assembled and soldered, requiring no DIY soldering. Simply connect the probe and power supply, and the oscilloscope is ready for immediate use.

Powered by an ARM Cortex-M3 STM32F103C8 microcontroller and equipped with a 2.4-inch color TFT LCD, the DSO138 is ideal for students, hobbyists, educators, and engineers who need a portable oscilloscope for low-frequency signal observation. The firmware is upgraded to the latest version before delivery, providing improved stability, better measurement accuracy, and enhanced features. Available from BDTronics, a trusted electronics tools and components seller in Bangladesh.

Features:

• Fully assembled and soldered, no DIY soldering required

• Ready to use, just connect probe and power supply

• Latest upgraded firmware pre-installed for improved performance

• ARM Cortex-M3 STM32F103C8 processor

• 2.4-inch color TFT LCD with clear waveform display

• HOLD function to freeze waveform display at any time

• Automatic, normal, and single trigger modes

• Rising edge and falling edge trigger support

• Negative delay function to observe pre-trigger waveforms

• Real-time waveform parameter display including frequency and duty cycle

• Measurement display for MAX, MIN, AVG, peak-to-peak, and virtual values

• Built-in waveform storage, retains data after power-off

• Adjustable vertical displacement for flexible signal viewing

• Can also be used as an ARM development and testing platform

Specifications:

• Number of Channels: 1

• Analog Bandwidth: 0 – 200kHz

• Sensitivity Range: 10mV/Div – 5V/Div

• Sensitivity Error: < 5%

• Resolution: 12-bit

• Maximum Input Voltage: 50V peak

• Coupling Modes: DC / AC / GND

• Maximum Real-Time Sampling Rate: 1Msps

• Timebase Range: 10µs/Div – 500s/Div

• Record Length: 1024 points

• Trigger Modes: Auto, Normal, Single

• Trigger Types: Rising edge, Falling edge

• Trigger Position: Fixed at 1/2 buffer size

• Display: 2.4-inch TFT LCD

• Display Resolution: 320 × 240

• Power Supply: 9V DC (8–12V acceptable)

• Supply Current: 120mA

• Dimensions: 117 × 76 × 15 mm

• Weight: 70g (excluding cables)

Package Contents:

• DSO138 Mini Digital Oscilloscope (Fully Assembled)

• Acrylic Casing (Optional)
• 9V 1A Power Adapter (Optional)

• User Manual / CD

How to Assemble the Case:

How to Use:

• Connect the oscilloscope probe to the signal source

• Power the device using a 9V DC power supply (8–12V supported)

• Select appropriate voltage sensitivity and timebase

• Choose trigger mode based on signal type

• Use HOLD to freeze waveform for closer inspection

• View real-time waveform parameters on the display

• Store waveform data without losing it after power-off

• Ideal for observing analog signals such as PWM, audio, sensor output, and logic-level waveforms

Applications:

• Electronics learning and education

• Arduino and microcontroller signal testing

• DIY electronics projects and labs

• Basic circuit debugging and troubleshooting

• Signal analysis for low-frequency applications

• ARM development and experimentation

• Student labs, training centers, and workshops

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