The FNIRSI DSO-TC4 combines three essential tools in one handheld device: digital oscilloscope, component tester and signal generator.
Test circuits, check components and generate waveforms without carrying multiple instruments.
DSO TC4 Digital Oscilloscope
Signal Capture
10MHz analog bandwidth with 48MSa/s sampling rate.
Maximum test voltage of 400V using the included 10:1 probe.
Suitable for audio circuits, microcontroller signals and general electronics work.
Vertical and Time Base Range
Vertical sensitivity adjustable from 10mV/div to 10V/div.
Time base range from 50ns to 20s per division.
Capture both fast transients and slow-changing signals.
Trigger Modes
Auto, Normal and Single trigger modes.
Rising and falling edge detection.
Adjustable trigger level with visual indication.
Get stable waveforms on repetitive signals.
Automatic Measurements
The screen displays key values automatically:
Maximum, minimum, average and RMS voltage.
Peak-to-peak voltage, frequency, cycle time and duty cycle.
No manual calculations needed.
Waveform Storage
HOLD function freezes the display for closer examination.
Store and export waveforms for documentation.
Component Tester
Semiconductor Testing
Automatically identifies and tests:
Diodes – forward voltage drop measurement
Transistors – NPN and PNP types
FETs – JFET, IGBT, MOSFET
Thyristors – SCRs and bidirectional types
Zener diodes – voltage measurement
Insert the component. The tester identifies the type and shows pinout and parameters.
Passive Component Testing
Capacitors: 25pF to 1000μF
Resistors: 0.01Ω to 50MΩ
Inductors: 10μH to 1000μH
Automatic pin identification shows which leg is which.
Continuity Test
Audio-visual feedback confirms circuit connectivity.
Quick check for shorts and open connections.
Signal Generator
13 Waveform Types
Built-in DDS function generator produces 13 different waveforms.
Frequency range from 0 to 50kHz.
Output voltage adjustable up to 3V.
PWM Output
Square wave duty cycle adjustable from 0% to 100%.
Amplitude adjustable from 0.1V to 3.0V.
Useful for testing PWM-controlled circuits and motor drivers.
Additional Features
Sensor Support
Works with DS18B20 temperature sensors.
Works with DHT11 temperature and humidity sensors.
Read sensor data directly on screen.
Infrared Decoding
Decodes NEC protocol infrared signals.
Useful for debugging and repairing remote control devices.
Auto Calibration
Automatic calibration maintains accuracy across measurement modes.
One-key AUTO function sets up waveform display quickly.
Display and Interface
2.8-inch colour TFT screen with LED backlight.
Adjustable brightness for different lighting conditions.
Eight language options including English.
Portable and Rechargeable
Dimensions: 90 × 142 × 27.5mm
Weight: approximately 186g
Built-in 1500mAh rechargeable battery.
USB Type-C charging.
Auto shutdown options at 15, 30 or 60 minutes to save battery.
What’s in the Box
- FNIRSI DSO-TC4 main unit
- P6100 high voltage probe (10:1)
- Alligator clip probe
- Three test hooks for component testing
- Power adapter
- USB Type-C charging cable
- Carrying case
- User manual
Who Is This For?
Electronics hobbyists working on Arduino and Raspberry Pi projects.
Repair technicians diagnosing faults on circuit boards.
Students learning electronics and signal analysis.
Makers who need oscilloscope, tester and signal generator in one portable tool.
Field technicians who can’t carry multiple instruments.
Practical Uses
Debug microcontroller I/O signals.
Test unknown transistors, capacitors and resistors.
Generate test signals for amplifier and filter circuits.
Check power supply ripple and noise.
Verify component values before soldering.
Decode infrared remote control signals.
Fast UK Delivery
Orders ship from our UK warehouse within 1-2 business days.
No long waits. No customs delays.
60-day returns and 12-month guarantee.
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