FNIRSI DSO-TC3 SigGen 3-in-1 Transistor Tester Handheld Digital Oscilloscope

FNIRSI DSO-TC3 3-in-1 Handheld Digital Oscilloscope and Component Tester

The FNIRSI DSO-TC3 combines a handheld digital oscilloscope, an electronic component tester and a signal generator in one compact device for diagnostics, maintenance and field work. It features a 10 MS/s sampling rate, 500 kHz bandwidth, a smart component tester and a DDS signal generator with six waveform types. The unit measures 79 × 103 × 31 mm and has a 2.4-inch colour display and a built-in 1,500 mAh battery.

Colour display

The 2.4-inch Full Color HD TFT display presents waveforms, component symbols and measurement parameters in colour for clear viewing in a range of lighting conditions, including bright environments.

Digital oscilloscope

Oscilloscope mode provides real-time signal analysis with a sampling rate of 10 MS/s and a bandwidth of 500 kHz. The maximum input voltage is up to 400 V when using a 10:1 probe. The voltage range is 80 Vpp (±40 V) with a 1:1 probe and 800 Vpp (±400 V) with a 10:1 probe. Vertical sensitivity is adjustable from 10 mV to 10 V, and the time base ranges from 1 µs to 10 s.

Auto, normal and single-shot trigger modes, rising or falling trigger edges and an AUTO button help capture stable waveforms. Automatic measurements include maximum, minimum, average, RMS and peak-to-peak voltage, frequency, period and duty cycle. A built-in calibrated 1 kHz square wave is provided for probe compensation. The waveform can be held on screen using the HOLD function.

Transistor and passive component tester

The tester automatically identifies component terminals and measures NPN and PNP transistors, N- and P-channel MOSFETs, IGBTs, JFETs, thyristors (SCRs), triacs, standard and Zener diodes, diode pairs, resistors, capacitors and inductors. It measures transistor parameters including hFE, base-emitter voltage and collector current, as well as gate capacitance and drain resistance.

• Transistors: NPN and PNP, β 10–600
• MOSFETs: N-channel, P-channel and IGBT
• JFETs: supported
• Thyristors: SCR and TRIAC; trigger voltage <5 V, gate current <6 mA
• Diodes: standard and dual; forward voltage <4.5 V
• Zener diodes: 0.01–4.5 V using sockets 1-2-3, or 0.01–32 V using sockets K-A-A
• Resistors: 0.01 Ω–50 MΩ
• Capacitors: 25 pF–100 mF
• Inductors: 10 µH–1,000 mH
• Batteries: 0.1–4.5 V, with voltage and polarity measurement

Signal generator

The built-in DDS generator produces sine, square, pulse, triangle, ramp and DC signals. Frequency is adjustable from 1 Hz to 100 kHz, amplitude from 0 to 3.3 V, and duty cycle from 0 to 100%. It can be used to test circuits, simulate signals and check circuit operation without connecting a separate signal generator.

Additional tools

Tools mode includes circuit continuity testing, input voltage measurement from 0 to 40 V, PWM output and Zener diode testing. The device can read temperatures from DS18B20 sensors over a range of 0–85°C, and temperature and humidity from DHT11 sensors over ranges of 0–60°C and 5–95%, respectively. Its infrared decoder analyses NEC protocol signals and displays the user code, data code and IR waveform. A calibration function is also available.

Controls, stand and housing

One-button mode switching, a logical menu, D-pad controls and a HOLD button support straightforward operation. The device includes overvoltage protection. Its integrated foldable stand adjusts up to 90° for hands-free use on a workbench. The ABS housing has a non-slip design and is intended for workshop, laboratory and field use.

Battery and charging

The built-in 1,500 mAh, 3.7 V lithium-polymer battery provides up to 4 hours of operation. Charging is via USB Type-C at 5 V / 1 A (5 W), allowing the device to be charged from a compatible charger, power bank or computer.

Specifications

• Manufacturer: FNIRSI
• Model: DSO-TC3
• Display: 2.4-inch Full Color HD TFT
• Dimensions: 79 × 103 × 31 mm
• Battery: 1,500 mAh, 3.7 V lithium-polymer
• Operating time: up to 4 hours
• Charging: USB Type-C, 5 V / 1 A (5 W)
• Stand: foldable, adjustable up to 90°
• Housing material: ABS
• Oscilloscope sampling rate: 10 MS/s
• Bandwidth: 500 kHz
• Input impedance: 1 MΩ
• Coupling: AC / DC
• Voltage range with 1:1 probe: 80 Vpp (±40 V)
• Voltage range with 10:1 probe: 800 Vpp (±400 V)
• Vertical sensitivity: 10 mV–10 V
• Time base: 1 µs–10 s
• Trigger modes: Auto / Normal / Single
• Trigger edge: rising / falling
• Automatic measurements: Vmax, Vmin, Vave, Vrms, Vpp, frequency, period and duty cycle
• Calibration signal: 1 kHz square wave
• Signal generator waveforms: sine, square, pulse, triangle, ramp and DC
• Signal generator frequency range: 1 Hz–100 kHz
• Signal generator amplitude: 0–3.3 V
• Signal generator duty cycle: 0–100%
• Circuit continuity test: yes
• Input voltage measurement: 0–40 V
• PWM output: yes
• DS18B20 temperature sensor range: 0–85°C
• DHT11 temperature and humidity ranges: 0–60°C / 5–95%
• Infrared decoder: NEC protocol (user code and data)

Included

• FNIRSI DSO-TC3 oscilloscope
• Measuring probe
• 3 test clips
• USB-C cable
• User manual