FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator

By andibond | 26.01.2026

Product Introduction

The FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator is a highly integrated and portable electronic measuring instrument designed to address the multifaceted needs of electronics enthusiasts, hobbyists, and professionals. This innovative 3-in-1 device skillfully combines the functionalities of a digital oscilloscope, an electronic component tester, and a signal generator into a single compact unit. It stands out in the market by offering comprehensive diagnostic and testing capabilities, making it an indispensable tool for circuit debugging, component verification, and signal analysis. As an upgraded version of its predecessor, the DSO-TC2, the TC3 brings enhanced performance, including improved capacitance ESR detection, a more robust function signal generator, increased oscilloscope bandwidth and sampling rate, and expanded input voltage and diode detection ranges. This makes the FNIRSI DSO-TC3 an ideal solution for anyone seeking a versatile, accurate, and portable device for their electronic projects and troubleshooting tasks. Check out our other technical reviews for more hardware testing.

Technical Support & Resources

Resources: FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator.pdf

Hardware specifications

Core Specifications: FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator

• Brand Name: FNIRSI
• Origin: Mainland China
• DIY Supplies: Electrical
• Certification: CE
• Display screen: 2.4 inch TFT color screen
• Supply voltage: Rechargeable lithium battery (Built-in, demountable)
• Charging specifications: Type-C 5V
• Bracket specifications: All-in-one foldable stand
• High-concerned chemical: None
• Digital Channels: 1
• Real-time sample rate: 10MSa/s
• Analog Bandwidth: 500KHz
• Input resistance: 1MΩ
• Coupling method: AC/DC
• Test voltage range (10:1 probe): 800Vpp (±400V)
• Test voltage range (1:1 probe): 80Vpp (±40V)
• Vertical Sensitivity (x1): 10mV-10V
• Horizontal time base range: 1us-10s
• Trigger mode: Auto / Normal / Single
• Trigger type: Rising edge / Falling edge
• Waveform Freeze: Yes
• Automatic measurement: Maximum, minimum, average, RMS, peak-to-peak, frequency, period, duty cycle
• Triodes: β is greater than 10 and less than 600 (Magnification hfe, base-emitter voltage Ube, Ic/Ie, collector-emitter reverse cut-off current Iceo, Ices, protection diode forward voltage drop Uf)
• Diodes: Forward voltage drop <4.5V (Forward voltage drop, junction capacitance, reverse leakage current)
• Regulated diode (1-2-3 test area): 0.01-4.5V (forward voltage drop, reverse breakdown voltage)
• Regulated diode (K-A-A test area): 0.01-32V (reverse breakdown voltage)
• MOSFET (JFET): Gate capacitance Cg, drain current Id under Vgs, protection diode Tube forward pressure drop Uf.
• MOSFET (IGBT): Drain current Id under Vgs, protection diode forward voltage drop Uf.
• MOSFET (MOSFET): Turn-on voltage Vt, gate capacitance Cg, drain-source resistance Rds, protection Diode forward voltage drop Uf.
• SCRs/TRIAC: Turn-on voltage <5V, gate Pole trigger current <6mA (Gate voltage)
• Capacitor: 25pF~100mF (Capacitance value, loss factor Vloss)
• Resistor: 0.01Ω~50MΩ (Resistance)
• Inductor: 10uH~1000uH (Inductance value, DC resistance)
• Battery: 0.1~4.5V (Voltage value, positive and negative polarity)
• Input voltage: 0~40V (Voltage value)
• DS18B20: 0-85℃ (Temperature)
• DHT11: 0-60℃/5-95% (Humidity)
• Infrared remote decoding: NEC protocol infrared code
• Function Signal Generator (Sine wave): 1-100KHz / 0-3.3V / 50% duty cycle
• Function Signal Generator (Square wave): 1-100KHz / 3.3V / 50% duty cycle
• Function Signal Generator (Pulse wave): 1-100KHz / 3.3V / 0-100% duty cycle
• Function Signal Generator (Triangle wave): 1-100KHz / 0-3.3V / 50% duty cycle
• Function Signal Generator (Ramp): 1-100KHz / 0-3.3V / 0-100% duty cycle
• Function Signal Generator (DC): 0-3.3V

Available Versions

Available Versions & Selection Guide

The FNIRSI DSO-TC3 is available in two main versions: the DSO-TC3 Standard and the DSO-TC3 Option. The Standard package includes the DSO-TC3 unit, one ordinary probe, three test hooks, a Type-C charging cable, a packing box, and a manual. The Option package provides an enhanced kit, featuring the DSO-TC3 unit, a P6100 High Voltage Probe, one ordinary probe, three test hooks, an adapter, a Type-C charging cable, a packing box, and a manual, offering greater versatility for high-voltage measurements.

Package Contents

What’s in the Box?

Features and benefits

Why I love FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator

• Comprehensive 3-in-1 Functionality for Enhanced Versatility: The FNIRSI DSO-TC3 masterfully integrates a digital oscilloscope, a versatile component tester, and a precise signal generator into a single, compact device. This multi-functional design eliminates the need for multiple specialized tools, saving bench space and reducing costs for hobbyists and professionals alike. Users can seamlessly switch between analyzing complex waveforms, identifying unknown components, and generating various test signals, making it an invaluable asset for a wide array of electronic development, repair, and educational applications.
• High-Performance Oscilloscope for Accurate Signal Analysis: Equipped with a real-time sample rate of 10MSa/s and an analog bandwidth of 500KHz, the DSO-TC3 allows for clear and accurate capture of fast-paced signals, ensuring precision in electronic measurements. Its input resistance of 1MΩ and AC/DC coupling methods provide flexibility for different measurement scenarios. The device supports a test voltage range of up to 80Vpp (±40V) with a 1:1 probe and an impressive 800Vpp (±400V) with a 10:1 probe, catering to both low-voltage circuit debugging and higher voltage applications. Furthermore, its vertical sensitivity from 10mV-10V and horizontal time base range from 1us-10s, coupled with Auto/Normal/Single trigger modes and rising/falling edge triggering, enable detailed waveform analysis and stable signal acquisition.
• Advanced Component Testing for Efficient Troubleshooting: The integrated transistor tester offers extensive capabilities for identifying and characterizing a wide range of electronic components. It can test triodes (with β between 10 and 600, displaying hfe, Ube, Ic/Ie, Iceo, Ices, Uf), diodes (forward voltage drop <4.5V, junction capacitance, reverse leakage current), and regulated diodes (0.01-32V reverse breakdown voltage). MOSFETs (JFET, IGBT, MOSFET types) are thoroughly analyzed for gate capacitance, drain current, turn-on voltage, and drain-source resistance. SCRs and TRIACs can be tested for turn-on voltage (<5V) and gate trigger current (<6mA). Additionally, it accurately measures capacitors from 25pF to 100mF (including loss factor Vloss), resistors from 0.01Ω to 50MΩ, and inductors from 10uH to 1000uH (with DC resistance). This comprehensive testing suite significantly speeds up component verification and fault diagnosis.
• Versatile Signal Generation for System Debugging and Calibration: The built-in function signal generator provides six different waveform outputs: sine, square, pulse, triangle, ramp, and DC. These waveforms can be generated across a frequency range of 1-100KHz, with adjustable voltage outputs (0-3.3V for sine, triangle, ramp, DC; 3.3V for square and pulse) and duty cycles (50% for sine, square, triangle; 0-100% for pulse and ramp). This functionality is crucial for injecting test signals into circuits, verifying system responses, calibrating sensors, and performing various diagnostic tasks, making it an essential tool for circuit design and validation.
• Enhanced Portability and User-Friendly Design: Featuring a vibrant 2.4-inch TFT color display and a built-in rechargeable lithium battery, the DSO-TC3 is designed for maximum portability and ease of use. The Type-C 5V charging specification ensures convenient power replenishment. Its all-in-one foldable stand allows for hands-free operation, providing a stable viewing angle whether on a workbench or in the field. The device also includes practical features like infrared decoding for NEC protocol remote controls, temperature measurement (DS18B20: 0-85℃), and humidity measurement (DHT11: 0-60℃/5-95%), further expanding its utility beyond core electronic testing.

Pros and Cons

Strengths & Weaknesses:

What I Like
— Integrated 3-in-1 functionality (oscilloscope, component tester, signal generator) saves space and cost.
— Decent oscilloscope performance with 500KHz analog bandwidth and 10MSa/s real-time sample rate.
— Wide component testing capabilities for triodes, diodes, MOSFETs, SCRs, TRIACs, capacitors, resistors, and inductors.
— Versatile signal generator with multiple waveform types and adjustable parameters (1-100KHz, 0-3.3V).
— Portable design with a 2.4-inch color TFT display, built-in rechargeable battery, and foldable stand.
— Includes useful additional features like infrared decoding, temperature (DS18B20), and humidity (DHT11) measurement.
— High voltage testing capability up to 800Vpp (±400V) with a 10:1 probe.

Points to Consider
— Analog bandwidth of 500KHz might be limiting for high-frequency applications.
— Single digital channel for the oscilloscope might restrict certain multi-signal analyses.
— Some users reported issues with the device not turning on, indicating potential quality control variations.
— The display size of 2.4 inches, while portable, can be small for detailed waveform analysis.
— Inductance measurement is limited to 10uH-1000uH and resistance less than 2.1kΩ for two-legged components.

User reviews

Reviews | Customer Feedback ⭐ 4.8 (38) | Sold (139)

Authentic Feedback Analysis:
⭐ 5.0/5 | AliExpress Shopper: Everything went well. The packaging is good, in a foam box. Everything works and is complete as on the website. I recommend it. The device itself is surprisingly a little smaller than it seemed in the photo 🙂
⭐ 5.0/5 | R***k: Product well packaged. Delivered quickly. Conforms to the description. I recommend the seller.
⭐ 5.0/5 | G***r: Amazing machine, professional packaging, time will tell.
⭐ 5.0/5 | N***o: excellent seller fast shipping all ok
⭐ 5.0/5 | G***v: Good quality. Working well.
⭐ 5.0/5 | AliExpress Shopper: perfect received quickly
⭐ 1.0/5 | m***m: unfortunately the instrument, despite being charged for 24 hours, does not turn on the display when pressing the power button. with the charger inserted, only the red light illuminates. the product does not turn on, I hope the seller contacts me.
⭐ 5.0/5 | J***a: excellent. it arrived quickly and very well, just as ordered. Thanks, congratulations.
⭐ 5.0/5 | E***k: I still haven’t received the order and you consider it finalized. It is in distribution with the Argentine Post Office. On Friday, May 2nd, I was at the Argentine Post Office and they asked me to come back this week on Wednesday the 7th or Thursday the 8th. There is a big delay due to a strike at Customs and at the Post Office itself. I understand that it is difficult for you to understand, but our reality is a disaster. Eduardo Miguel Scolnik
⭐ 5.0/5 | F***o: It came well protected in a styrofoam cooler, I checked the product and it came with many accessories and everything works well.
⭐ 5.0/5 | g***r: super fast shipping thank you very much, just need to test it.
⭐ 5.0/5 | R***i: Excellent product, very good quality. I recommend it.
⭐ 5.0/5 | I***a: excellent, excellent
⭐ 1.0/5 | D***C: NOT yet received. Will rewrite feedback on receipt.,NOT yet received.

Pinout and Interface Map

Pinout Configuration: FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator

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

Final summary

Final Verdict: FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator

The FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Signal Generator stands out as an exceptionally versatile and cost-effective 3-in-1 electronic measuring instrument, perfectly suited for a broad spectrum of users from hobbyists to professional technicians. Its seamless integration of a digital oscilloscope, a comprehensive component tester, and a functional signal generator into a single portable unit offers unparalleled convenience and efficiency. While its 500KHz analog bandwidth might not satisfy the most demanding high-frequency applications, it provides ample capability for general circuit debugging, component identification, and signal generation in most common electronic projects. The device’s robust component testing features, coupled with its user-friendly design and additional functionalities like infrared decoding and environmental sensing, make it an ideal choice for anyone looking to consolidate their toolkit without compromising on essential diagnostic power. The main advantage that truly sets the DSO-TC3 apart is its remarkable versatility and portability, offering a complete lab in the palm of your hand, making it an excellent investment for educational purposes, field service, and home electronics work. For more in-depth analyses, visit andibond.com.