The FNIRSI DSO-TC3 combines three compact bench tools in one handheld device: a digital oscilloscope, a signal generator, and an automatic component tester. It is built for quick electronics checks, repair benches, education, and portable diagnostics where a full-size oscilloscope is not always practical.

The oscilloscope section supports 500kHz analog bandwidth, up to 10MSa/s sampling, AC/DC coupling, multiple trigger modes, and a 2.8-inch color display. The built-in generator provides common waveform output for simple circuit stimulation, while the transistor tester can identify and measure common components such as resistors, capacitors, diodes, transistors, MOSFETs, SCRs, and inductors.

For a newer handheld upgrade, compare it with the FNIRSI DSO-TC4 3-in-1 Oscilloscope. For higher-bandwidth waveform capture, see the FNIRSI 1013D Tablet Oscilloscope or the FNIRSI 1014D Oscilloscope with Generator.

Technical Specifications

Brand	FNIRSI
Model	DSO-TC3
Integrated Functions	Digital oscilloscope, signal generator, transistor/component tester
Display	2.8-inch color screen
Oscilloscope Bandwidth	500kHz
Maximum Sampling Rate	10MSa/s
Input Coupling	AC / DC
Trigger Modes	Auto / Normal / Single
Signal Generator Output	Square, sine, pulse, triangle, ramp, half-wave, full-wave, and DC output support
Generator Frequency Range	1Hz to 100kHz, waveform dependent
Component Detection	Resistor, capacitor, diode, transistor, MOSFET, SCR, inductor, and related component identification
Resistance Measurement	Supports low-ohm to high-ohm resistance testing within component tester range
Capacitance Measurement	Supports pF to mF-level capacitor testing within component tester range
Inductance Measurement	Supports H to H-level inductance testing within component tester range
Power	Built-in rechargeable lithium battery
Charging Interface	USB Type-C
Typical Bench Role	Portable waveform viewing, basic signal output, and component identification

Integration Notes & Hardware Guidance

Use the DSO-TC3 for low-frequency waveform inspection, quick component identification, and portable troubleshooting rather than high-bandwidth RF or fast digital bus analysis.
Discharge capacitors before using the component tester function to reduce measurement errors and avoid damaging the tester input.
Use oscilloscope mode for live circuit checks and component tester mode only after removing or isolating the component where practical.
Use the built-in generator for basic circuit response checks, then move to a dedicated function generator when higher precision or wider frequency range is needed.
For power-path testing, the FNIRSI FNB58 USB-C Fast Charge Tester is a useful companion; for powered board bring-up, pair with the UNI-T UTP1605S DC Bench Power Supply.

Packing List

FNIRSI DSO-TC3 handheld oscilloscope host 1
Oscilloscope probe or test lead set 1
Component test accessory set 1
USB Type-C charging cable 1
User documentation 1

FAQ

What functions are built into the FNIRSI DSO-TC3?

It integrates a digital oscilloscope, a signal generator, and an automatic transistor/component tester in one handheld device.

What bandwidth does the oscilloscope mode support?

The oscilloscope mode supports 500kHz bandwidth and up to 10MSa/s sampling, suitable for low-frequency electronics checks and basic waveform inspection.

Can it test electronic components automatically?

Yes. The component tester can identify and measure common parts such as resistors, capacitors, diodes, transistors, MOSFETs, SCRs, and inductors.

Does the DSO-TC3 include a signal generator?

Yes. It includes a basic signal generator with multiple waveform types and a frequency range up to 100kHz depending on waveform type.

Is it a replacement for a full-size bench oscilloscope?

No. It is best used as a portable quick-check tool. For higher bandwidth, deeper analysis, or larger display operation, a tablet or desktop oscilloscope is a better match.

SKU:US31210941 Category: electronic components