FNIRSI DSO-TC4

By andibond | 26.01.2026

Product Introduction

The FNIRSI DSO-TC4 emerges as a highly versatile and indispensable 3-in-1 electronic measurement tool, meticulously engineered to address the complex demands of both maintenance and research & development industries. This upgraded device uniquely integrates the functionalities of a digital oscilloscope, a comprehensive electronic component tester, and a signal generator into a single, portable unit. It solves the critical problem of needing multiple specialized instruments for electronic diagnostics and prototyping, offering a streamlined and efficient workflow. Its compact design, coupled with a robust rechargeable battery, positions it as an ideal solution for field technicians, hobbyists, and professional engineers who require powerful analytical capabilities on the go. The DSO-TC4 stands out in the market by combining high-speed sampling and broad analog bandwidth with advanced component identification and testing, making it a cornerstone for precise electronic troubleshooting and design validation. Check out our other technical reviews for more hardware testing.

Technical Support & Resources

Resources: FNIRSI DSO-TC4.PDF

Hardware specifications

Core Specifications: FNIRSI DSO-TC4

• Model: DSO-TC4
• Screen: 2.8-inch TFT Color Screen
• Backlight: Brightness Adjustable
• Power Supply: TYPE-C (5V/1A)
• Battery: 3.7V/1500mAh
• Languages: Chinese, English, Deutsch, Português, にほんご, Español, 한국인, Русский
• Size: ≈90x142x27.5mm
• Product Weight: ≈186g
• Real-Time Sampling Rate: 48MSa/s
• Analog Bandwidth: 10MHz
• Input Impedance: 1MΩ
• Coupling Mode: AC/DC
• Test Voltage Range: 1:1 Probe: 80Vpp (+40V); 10:1 Probe: 800Vpp (+400V)
• Vertical Sensitivity: 10mV/div~10V/div (X1 range)
• Vertical Displacement: Adjustable with indication
• Time Base Range: 50ns~20s
• Trigger Mode: Auto/Normal/Single
• Trigger Type: Rising edge, Falling edge
• Trigger Level: Adjustable with indication
• Waveform Freeze: Yes (HOLD function)
• Automatic Measurement: Max, Min, Avg, RMS, Vpp, Frequency, Cycle, Duty Cycle
• Transistor Test: Support (Amplification factor «hfe»; Base-Emitter voltage «Ube», Ic/Ie, Collector-Emitter reverse leakage current «Iceo», Ices, Forward voltage drop of protection diode «Uf»)
• Diode Test: Forward voltage drop <5V (Forward voltage drop, Junction capacitance, Reverse leakage current)
• Zener Diode Test: 0.01-32V (Reverse Breakdown Voltage in K-A-A Test Area)
• Field-Effect Transistor (FET) Test: JFET (Gate capacitance «Cg», Drain current Id under «Vgs», Forward voltage drop of protection diode «Uf»), IGBT (Drain current Id under Vgs, Forward voltage drop of protection diode Uf), MIOSTET (Threshold voltage «Vt», Gate capacitance «Cg», Drain-Source resistance «Rds», Forward voltage drop of protection diode «Uf»)
• Unidirectional SCR Test: Trigger voltage <5V, Gate level (Gate voltage)
• Bidirectional SCR Test: Trigger current <6mA
• Capacitor Test: 25pF~100mF (Capacitance value, Loss factor «Vloss»)
• Resistor Test: 0.01Ω~50MΩ (Resistance value)
• Inductor Test: 10μH~1000μH (Inductance value, DC resistance)
• DS18B20 Test: Support (Temperature sensor, Pins: GND, DQ, VDD)
• DHT11 Test: Support (Temperature and humidity sensor, Pins: VDD, DATA, GND)
• Output Waveform: Supports 13 waveform outputs
• Waveform Frequency: 0-50KHz
• Square Wave Duty Cycle: 0-100%
• Waveform Amplitude: 0.1V-3.0V
• Voltage Protection: ±400V
• Waveform Storage: Supports screenshot saving and viewing
• Output Parameters: Frequency, amplitude, duty cycle adjustable
• Laser Hazard Level: Class 1 (<1mW)
• Certification: CE, FCC, WEEE

Available Versions

Available Versions & Selection Guide

The FNIRSI DSO-TC4 is available as a single, comprehensive model, DSO-TC4, offering a unified set of features without further modifications or specific versions to choose from.

Package Contents

What’s in the Box?

The FNIRSI DSO-TC4 package includes the following items:

• DSO-TC4 Host *1
• Test Hook *3
• P6100 Probe *1
• Alligator Clip Probe *1
• USB Type-C *1
• User Manual *1
• Package Box *1

Features and benefits

Why I love FNIRSI DSO-TC4

• High-Performance Oscilloscope Capabilities: The DSO-TC4 boasts an impressive 10MHz analog bandwidth and a real-time sampling rate of 48MSa/s, allowing users to capture and analyze intricate signals with exceptional detail. This high sampling rate is crucial for accurately visualizing fast-changing waveforms, while the broad bandwidth ensures suitability for a wide array of electronic applications, from audio circuits to digital logic, providing precise insights into signal integrity and behavior.
• Comprehensive Component Testing: This device excels as an advanced component measurement tool, capable of efficiently testing a diverse range of semiconductor components including transistors (measuring amplification factor «hfe», Base-Emitter voltage «Ube», Ic/Ie, Collector-Emitter reverse leakage current «Iceo», Ices, and protection diode forward voltage drop «Uf»), diodes (forward voltage drop <5V, junction capacitance, reverse leakage current), Zener diodes (0.01-32V reverse breakdown voltage), and various Field-Effect Transistors (JFET, IGBT, MIOSTET, with measurements like gate capacitance «Cg», drain current «Id» under «Vgs», threshold voltage «Vt», and drain-source resistance «Rds»). It also supports testing of unidirectional SCRs (trigger voltage <5V, gate level) and bidirectional SCRs (trigger current <6mA), capacitors (25pF~100mF, including loss factor «Vloss»), resistors (0.01Ω~50MΩ), and inductors (10μH~1000μH, including DC resistance). Furthermore, it supports specialized tests for DS18B20 temperature sensors and DHT11 temperature and humidity sensors, simplifying diagnostics and characterization of a vast array of electronic parts.
• Integrated Signal Generator: Beyond its measurement capabilities, the DSO-TC4 functions as a versatile signal generator, offering 13 different waveform outputs. Users can precisely control the waveform frequency from 0 to 50KHz, adjust the square wave duty cycle from 0-100%, and set the output amplitude between 0.1V and 3.0V. This feature is invaluable for injecting test signals into circuits for debugging, frequency response analysis, and functional testing, eliminating the need for a separate signal generator.
• User-Friendly Interface and Portability: Equipped with a vibrant 2.8-inch TFT color screen and adjustable backlight brightness, the DSO-TC4 provides a clear and intuitive interface for easy operation and data interpretation. Its compact dimensions (approximately 90x142x27.5mm) and lightweight design (approximately 186g) make it exceptionally portable, ideal for technicians and engineers who need to perform diagnostics in various locations. The built-in 3.7V/1500mAh rechargeable lithium battery, powered via a TYPE-C (5V/1A) interface, ensures extended operation with a standby time of 4 hours, providing true mobility without constant power concerns.
• Robust Protection and Automated Features: The device includes crucial voltage protection up to ±400V, safeguarding both the instrument and the user during high-voltage measurements. It supports waveform storage through screenshot saving and viewing, facilitating post-analysis and documentation. The oscilloscope also offers automatic measurement functions for Max, Min, Avg, RMS, Vpp, Frequency, Cycle, and Duty Cycle, significantly speeding up analysis. Furthermore, its ability to automatically identify the type and pin arrangement of tested components streamlines the testing process, enhancing efficiency and reducing potential errors for both novices and experienced users.

Pros and Cons

Strengths & Weaknesses:

What I Like
— Multifunctional 3-in-1 device (oscilloscope, component tester, signal generator)
— High 48MSa/s sampling rate and 10MHz analog bandwidth for detailed signal analysis
— Comprehensive component testing for transistors, diodes, FETs, SCRs, RLC, and sensors
— Built-in signal generator with 13 waveform outputs and adjustable parameters
— Portable design with a 1500mAh rechargeable battery and Type-C charging
— User-friendly 2.8-inch TFT color screen with adjustable backlight
— Robust ±400V voltage protection
— Automatic component identification and measurement functions
— Multi-language support for global users

Points to Consider
— The 10MHz bandwidth might be limiting for very high-frequency digital applications
— Screen size of 2.8 inches, while color, could be small for complex waveform analysis over extended periods
— Standby time of 4 hours, while good for portability, may require frequent recharging for continuous long-term use
— Laser rangefinder feature mentioned in one OCR block (IMAGE_OCR_4) is not detailed in specifications or other descriptions, suggesting it might be a misinterpretation or a minor, undocumented feature.

User reviews

Reviews | Customer Feedback ⭐ 4.9 (36) | Sold (171)

Authentic Feedback Analysis:
⭐ 5.0/5 | r***r: THANK YOU, DEAR SELLER, FOR AN EXCELLENT PRODUCT. I RECEIVED EVERYTHING INTACT AND SAFE. I WILL ORDER PRODUCTS FROM YOU AGAIN! I RECOMMEND BOTH THE SELLER AND THE PRODUCT TO EVERYONE!!!
⭐ 5.0/5 | U***r: Arrived in 8 days, wonderful. Not just packaged well, but packaged beautifully. Display is bright, nicely sized. Just started putting it through its paces but the battery was charged well enough to setup and play with. The unit arrived complete with all accessories with a nicely done manual. What a good product, what a good deal.
⭐ 5.0/5 | A***E: Complete article and quickly delivered. I will test it a little later.
⭐ 5.0/5 | g***r: Very good product. I recommend it.
⭐ 5.0/5 | O***r: Order ok, fast delivery.
⭐ 5.0/5 | B***z: Excellent equipment. Very necessary, congratulations to the seller. All ok ok, excellent.
⭐ 3.0/5 | AliExpress Shopper: Arrived well, but needs testing.
⭐ 5.0/5 | C***t: Wonderful equipment, I loved it.
⭐ 5.0/5 | А***а: OK!!!
⭐ 5.0/5 | A***i: Package arrived very quickly. Very well packed with all accessories included. Just tested — works perfectly. Recommended.
⭐ 5.0/5 | M***n: Great device, great value for money, fast shipping.
⭐ 5.0/5 | Ч***й: For this money, it’s just great!
⭐ 5.0/5 | AliExpress Shopper: Awesome device!!
⭐ 5.0/5 | С***ч: Alright, the main thing is the mobility of the item…
⭐ 5.0/5 | P***A: Excellently packed, works well. Thank you!
⭐ 5.0/5 | В***ч: Thank you, everything is fine, we will use it.

Pinout and Interface Map

Pinout Configuration: FNIRSI DSO-TC4

Below is the detailed pin mapping for the dual-MCU architecture:

Comparison table

Technical Specifications & Comparison FNIRSI DSO-TC4

— Oscilloscope —

— Transistor Tester —

— Signal Generator —

Final summary

Final Verdict: FNIRSI DSO-TC4

The FNIRSI DSO-TC4 stands out as an exceptional value proposition for anyone in need of a versatile and portable electronic testing solution. Its seamless integration of a 10MHz oscilloscope with a 48MSa/s sampling rate, a comprehensive component tester, and a functional signal generator makes it an ideal choice for hobbyists, students, and professionals in maintenance and R&D. The device’s ability to automatically identify components, coupled with its user-friendly interface and robust rechargeable battery, significantly enhances efficiency and convenience in various work environments. While the 10MHz bandwidth might be a limitation for extremely high-frequency applications, its broad range of features, including ±400V voltage protection and multi-language support, far outweighs this minor drawback. The DSO-TC4 is a highly recommended investment for those seeking a powerful, all-in-one tool that delivers precision and portability without breaking the bank. For more in-depth analyses, visit andibond.com.