Description
The DSO138 Digital Mini Oscilloscope Module is a compact and affordable oscilloscope designed for electronics students, hobbyists, technicians, and DIY enthusiasts. Its simple and reliable design makes it suitable for learning oscilloscope operation while also providing useful measurement capabilities for everyday low-frequency signal testing.
Powered by an ARM Cortex-M3 STM32F103C8 processor, the DSO138 features a 2.4-inch color TFT display for viewing waveforms clearly. With a maximum real-time sampling rate of 1Msps and 12-bit accuracy, it can be used to observe audio signals, infrared transmitter/receiver waveforms, low-frequency switching power supply signals, and other low-frequency circuits.
The oscilloscope provides automatic, regular, and one-shot acquisition modes, along with rising- and falling-edge triggering. Users can adjust the vertical sensitivity and horizontal time base according to the signal being measured, while the HOLD function allows the waveform to be frozen on the display.
The DSO138 also includes a 1Hz/3.3V square-wave test signal output, making it convenient for checking the operation of the module and practicing oscilloscope measurements. Its open design can also be used as a basis for further development, such as creating a millivoltmeter or data logger.
Key Features
- Fully assembled digital oscilloscope module
- 1Msps maximum real-time sampling rate
- 12-bit measurement accuracy
- 0–200kHz analog bandwidth
- 2.4-inch color TFT display
- 1024-byte sampling buffer
- Adjustable vertical sensitivity
- Adjustable horizontal time base
- Automatic, regular, and one-shot acquisition modes
- Rising- and falling-edge triggering
- Adjustable trigger level
- Negative-delay waveform observation
- HOLD function for freezing waveforms
- DC, AC, and GND coupling modes
- Built-in 1Hz/3.3V square-wave test signal
- ARM Cortex-M3 STM32F103C8 processor
- Compact and lightweight design
- Suitable for electronics training and DIY development
Technical Specifications
| Specification | Details |
|---|---|
| Model | DSO138 |
| Type | Digital Mini Oscilloscope Module |
| Real-Time Sampling Rate | 1Msps maximum |
| Accuracy | 12-bit |
| Sampling Buffer Depth | 1024 bytes |
| Analog Bandwidth | 0–200kHz |
| Vertical Sensitivity | 10mV/div – 5V/div |
| Input Impedance | 1MΩ |
| Maximum Input Voltage | 50Vpp with 1× probe / 400Vpp with 10× probe |
| Coupling Modes | DC / AC / GND |
| Horizontal Time Base | 10μs/div – 50s/div |
| Trigger Modes | Rising / Falling Edge |
| Acquisition Modes | Automatic / Regular / One-Shot |
| Waveform Hold | Yes |
| Test Signal Output | 1Hz / 3.3V Square Wave |
| Supply Voltage | DC 9V |
| PCB Size | 117 × 76mm |
| Screen Size | 52 × 40mm |
| Display | 2.4-inch Color TFT |
| Processor | STM32F103C8 ARM Cortex-M3 |
| Package Dimensions | 18 × 12.5 × 3cm |
| Package Weight | Approx. 119g |
Applications
The DSO138 is suitable for:
- Electronics education and training
- Audio signal testing
- Low-frequency circuit analysis
- Infrared transmitter/receiver signal testing
- Low-frequency switching power supply testing
- DIY electronics projects
- Embedded system development
- Circuit troubleshooting
- Waveform observation and measurement
- Oscilloscope learning and experimentation
Package Includes
- 1 × DSO138 Digital Oscilloscope Module
- 1 × Oscilloscope Probe
- 3 × English User Manuals
- 4 × Mounting Feet
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