The FNIRSI DSO-TC4 is an advanced 3-in-1 multifunction electronic diagnostic device that combines the capabilities of a Digital Oscilloscope, a Transistor Tester, and a Signal Generator into a single portable tool. Engineered for electronics enthusiasts, students, technicians, and engineers, this compact unit is ideal for efficient and accurate signal measurement, circuit debugging, and component identification.

This all-in-one handheld device is designed to meet the evolving needs of modern electronics troubleshooting, offering real-time waveform display, signal output generation, and component testing and analysis in a budget-friendly and space-saving design.

? Core Features & Technical Specifications:

? 1. Digital Oscilloscope Function:

• Bandwidth: 10MHz

• Sampling Rate: 48MSa/s (Million Samples per Second)

• Input Voltage Range: ±50V

• Display Modes: Real-time waveform, triggered capture

• Waveform Types: AC, DC, PWM, square, triangle

• Useful For: Signal visualization, circuit fault analysis, timing & logic inspection

? 2. Signal Generator (DDS):

• Frequency Range: Up to 1MHz

• Waveform Types: Sine, Square, Triangle, Sawtooth

• Functionality: Generate standard testing signals for simulation or calibration

• Amplitude Adjustable: Ideal for injecting signals into test points

• Use Cases: Audio testing, MCU signal simulation, waveform response testing

? 3. Transistor & Component Tester:

• Automatic Detection of Components:

  • NPN/PNP Transistors

  • Diodes, Triacs, SCRs

  • Capacitors, Inductors, Resistors

• Identifies: Pin configuration, gain (hFE), threshold voltage, leakage current

• Capacitance Measurement Range: 25pF – 100mF

• Use Cases: Repair, sorting, DIY electronics design & validation

?️ User Interface & Display:

• Display: Full-color backlit LCD with waveform visualizations

• Menu: Intuitive interface for easy navigation

• Control Buttons: Responsive physical controls for all 3 modes

? Power & Portability:

• Built-in Rechargeable Battery

• USB Charging Support (5V)

• Compact Handheld Form Factor

• Weight: Lightweight, ideal for mobile repair work or field diagnostics

? Ideal Use Cases:

• Electronics learning and prototyping

• Microcontroller signal visualization (Arduino, STM32, ESP32, etc.)

• Component testing for recycling or repair

• On-site equipment diagnostics

• Home lab setup for hobbyists