FNIRSI DSO-TC3 Review: The 3-in-1 Pocket Electronics Lab
Hands-on look at FNIRSI's best seller: the DSO-TC3 combines a 500 kHz oscilloscope, component tester and DDS signal generator in one rechargeable handheld.
What exactly is it?
- A digital storage oscilloscope — 500 kHz bandwidth, 10 MS/s sampling, one-key AUTO, and up to ±400 V input with the supplied high-voltage probe.
- A component tester — automatically identifies and measures transistors (NPN/PNP), MOSFETs, diodes, resistors, inductors and capacitors including ESR, with pin-out detection.
- A DDS signal generator — six waveforms (sine, square, pulse, triangle, ramp, DC) for injecting test signals.
The upgrade story: TC2 → TC3
What it's like to use
| Oscilloscope | 500 kHz bandwidth, 10 MS/s, one-key AUTO, ±400 V max (10x probe) |
|---|---|
| Component tester | NPN/PNP, MOSFET, diode, R/L/C + ESR, automatic pin-out |
| Signal generator | DDS — sine / square / pulse / triangle / ramp / DC |
| Extras | Continuity, temperature & humidity, IR remote decoding |
| Display | 2.4" colour TFT |
| Power | Built-in rechargeable lithium battery, USB-C |
Who should buy it
It supports in-circuit transistor testing, though readings are most reliable with the component isolated — surrounding parts can skew measurements, as with any component tester.
For PWM, analog sensor lines, slow serial and power-rail checks, yes. For fast digital buses (SPI at MHz rates) or crystal/RF work you'll want a higher-bandwidth scope like the FNIRSI DPOX180H.
The DSO-TC3 unit, a 10x high-voltage scope probe, component-test leads for the ZIF socket, and a USB-C charging cable.
The DSO-TC3 and its step-up siblings
FNIRSI DSO-TC3 3-IN-1 Handheld 500KHz 10MS/s Digital Oscilloscopes Signal Generator Transistor Tester
FNIRSI DSO-TC4 3-IN-1 10MHz 48MSa/s Digital Oscilloscope Transistor Tester Signal Generator
FNIRSI DST-210 / DST-201 Handheld 3-IN-1 Multimeter Oscilloscope Signal Generator
FNIRSI 2C53T 50MHz 250MS/s Handheld 3in1 Oscilloscope Multimeter Signal Generator
See the full FNIRSI oscilloscope and tester line-up at Tech2Have.
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