DSO 138 Open-Source Digital Oscilloscope Kit (2.4" TFT, 1Msps) with Case & Probe is a compact, open-source oscilloscope designed for electronic learning, DIY projects, and basic circuit debugging. Powered by an ARM Cortex-M3 (STM32F103C8) processor, it delivers reliable waveform capture with a 2.4-inch color TFT display and a maximum real-time sampling rate of 1Msps.
Ideal for students, hobbyists, and technicians, the DSO 138 offers essential oscilloscope functions in a pocket-sized format—perfect for signal observation, waveform analysis, and embedded development experiments.
Key Features
ARM Cortex-M3 Core (STM32F103C8): Built around a powerful microcontroller, making it suitable for learning, testing, and even secondary development projects.
2.4-Inch TFT Color Display: Clear and vibrant screen displays waveforms and measurement parameters for easy signal analysis.
1Msps Real-Time Sampling Rate: Ensures accurate signal capture within its 0–200kHz analog bandwidth range.
Multiple Trigger Modes: Supports automatic, normal, and one-shot trigger modes with rising or falling edge trigger options.
Waveform Freeze (HOLD Function): Allows users to pause waveform display for detailed analysis.
Waveform Storage Function: Saved waveforms remain stored even after power-off.
Built-in Test Signal Generator: Includes a 1Hz / 3.3V square wave output for calibration and testing.
Comprehensive Digital Measurements: Displays frequency, period, pulse width, duty cycle, MAX, MIN, AVG, peak-to-peak, and RMS values.
Partially Open-Source Design: MCU is pre-programmed and board components are pre-soldered. Suitable for further development into millivoltmeter or data logger applications.
Specifications
Processor: ARM Cortex-M3 (STM32F103C8)
Maximum Sampling Rate: 1Msps
Resolution: 12-bit
Sampling Buffer Depth: 1024 bytes
Analog Bandwidth: 0–200kHz
Vertical Sensitivity: 10mV/div – 5V/div (1-2-5 steps)
Input Impedance: 1MΩ
Maximum Input Voltage:
50Vpp (1:1 probe)
400Vpp (10:1 probe)
Coupling Modes: DC / AC / GND
Time Base Range: 10μs/div – 50s/div (1-2-5 steps)
Supply Voltage: DC 9V
PCB Size: 117 × 76 mm
Screen Size: 52 × 40 mm
Functions & Operation Tips
Long press [OK] at time base position to toggle waveform parameter display.
Press [SEL] + [+] to save waveform.
Press [SEL] + [-] to recall saved waveform.
Press [OK] + RESET to enter test mode.
If LED flashes rapidly, check for short circuits around MCU ports. If LED flashes every ~4 seconds, inspect possible open connections related to MCU ports.
Package Includes
1 × DSO 138 Digital Oscilloscope Kit (with transparent case)
1 × Oscilloscope Probe