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In my lab I have a FNIRSI DSO-TC3 component tester.

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If you want to buy, see here:

Vendor Product
AliExpress FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester 10MS/s Sampling Rate 500kHz Bandwidth Support Diode LCR Detect Signal Generator


I keep my documentation for this equipment here:

  • /home/jj5/electronics/equipment/scope-FNIRSI-DSO-TC3/


Purchased from here: FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Function Signal Generator 3 in 1 Multifunction Electronic Component Tester.


This product was reviewed by Learn Electronics Repair: FNIRSI DSO-TC3 3 in 1 Oscilloscope Signal Generator Component Analyzer Tester Cheap Electronics Lab.

On the top of the unit are three MCX coaxial sockets:

  • IN (0-40V): test voltage input port, the core wire is positive, the maximum measured voltage cannot exceed DC40V
  • DDS: signal generator output port; DDS stands for Direct Digital Synthesis
  • DSO: connect logic probe, oscilloscope test signal input port, the maximum input voltage cannot exceed 40Vpk; DSO stands for Digital Storage Oscilloscope



DSO-TC3 Product Manual:https://www.mediafire.com/file/3eddj8oght8m0q3/TC3_product_manual.pdf/file

FNIRSI DSO-TC3 combines a digital oscilloscope, electronic component tester, signal generator, continuity test, voltage test, temperature and humidity measurement, infrared decoding and other functions are skillfully integrated. It is equipped with a 2.4-inch color TFT display, built-in rechargeable lithium battery, brings users stronger and more practical functions with good portability.

FNIRSI DSO-TC3 is an upgraded version of DSO-TC2. On the basis of DSO-TC2, it has upgraded capacitance ESR detection, function signal generator output, oscilloscope bandwidth and sampling rate improvement, input voltage and diode detection range increase and so on. The improvement in performance and function of DSO-TC3 makes the device more stable and accurate in the detection process.

Packing list for NO.2(Option):

  • 1x DSO-TC3
  • 1x P6100 High Voltage Probe
  • 1x Ordinary probe
  • 3x Test hook
  • 1x Adapter
  • 1x Type-C charging cable
  • 1x Packing box
  • 1x Manual

Player Evaluation Section (Video by:Артем Косицын83) Product testing and evaluation


  • Model Number: DSO-TC3
  • DIY Supplies: ELECTRICAL
  • Brand Name: FNIRSI
  • Origin: Mainland China
  • Display screen: 2.4 inch TFT color screen
  • Supply voltage: Rechargeable lithium battery
  • Charging specifications: Type-C 5V
  • Bracket specifications: All-in-one foldable stand
  • Real-time sample rate: 10MSa/s
  • Analog Bandwidth: 500Khz
  • Input resistance: 1MΩ
  • Coupling method: AC/DC
  • Test voltage range: 400V
  • 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: Yes
  • Diodes: Forward voltage drop <4.5V
  • Regulated diode: 0.01~4.5V
  • SCR: Turn-on voltage <5V, gate Pole trigger current <6mA
  • Capacitor: 5pF~100mF
  • Resistor: 0.01Ω~50MΩ
  • Inductor: 10uH~1000mH
  • Battery: 0.1~4.5V
  • Input voltage: 0~40V
  • DS18B20: 0-85℃
  • DHT11: 0-60℃/5-95%
  • Infrared remote decoding: NEC protocol infrared code
  • Triangle wave: 1-10KHz/0-3.3V/50%,1-10KHz/0-3.3V/50%
  • Square wave: 1-100KHz/3.3V/50%
  • Pulse wave: 1-100KHz/3.3V/0-100%
  • Ramp: 1-10KHz/0-3.3V/0-100%
  • DC: 0-3.3V