# Portable oscilloscope Fnirsi DSO-TC4 3-in-1, 100 MHz bandwidth, handheld multimeter and waveform generator

**URL:** https://aio.lv/en/product--fnirsi-dso-tc4--11618318
**Data updated:** 2026-05-19 09:12 (EEST)
**Category:** Measuring tools
**Manufacturer:** Fnirsi
**Manufacturer code:** DSO-TC4
**EAN:** 5907085527192
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Fnirsi DSO-TC4 is a portable 3-in-1 test instrument combining a 100 MHz bandwidth oscilloscope with a handheld multimeter and a waveform generator. Designed for field service, electronics troubleshooting and education, it offers compact size, battery-powered operation and multiple measurement modes to capture, measure and generate signals for diagnostics and testing.

## Long description

FNIRSI DSO-TC4 is a portable 3-in-1 instrument that combines a digital oscilloscope, an electronic component tester and a signal generator. The device is intended for waveform analysis, component identification and signal simulation in service and diagnostics tasks. An intelligent Anti-Burn protection helps prevent damage to the input circuit when probes are connected incorrectly, and a 2.8-inch TFT color screen displays measurements and graphs for straightforward inspection.
Advantages
The instrument provides an analog bandwidth up to 10 MHz and a real-time sampling rate of 48 MSa/s, enabling detailed waveform capture. The integrated component tester automatically recognises diodes, transistors (including MOSFETs), resistors, capacitors and other passive and active components. A built-in signal generator offers 13 waveform types with frequencies from 0 to 50 kHz and amplitude control. USB-C charging and data transfer, a 1,500 mAh lithium-ion battery and multilingual interface (8 languages) support convenient portable operation.
Suitable for
Field service diagnostics of electronic circuits
Component testing and quick identification of semiconductors and passives
Generating test signals for circuit verification and troubleshooting
Educational use and basic laboratory measurements
Key specifications
Display: 2.8-inch TFT color screen with adjustable brightness
Analog bandwidth: 10 MHz
Real-time sampling rate: 48 MSa/s
Input impedance: 1 MΩ
Coupling modes: AC / DC
Vertical sensitivity (X1 range): 10 mV/div – 10 V/div
Time base range: 50 ns – 20 s
Trigger modes: Auto / Normal / Single; trigger types: rising edge, falling edge
Automatic measurements: Max, Min, Average, RMS, Vpp, Frequency, Period, Duty cycle
Signal generator: 13 waveform types, frequency 0–50 kHz, amplitude 0.1–3.0 V, fill factor 0–100%
Component tester ranges: resistors 0.01 Ω – 50 MΩ; capacitors 25 pF – 100 mF; inductors 10 µH – 1000 µH; Zener diodes 0.01–32 V; diode forward drop \<5 V
Test voltage range: Probe X1 up to 80 Vpp (±40 V); Probe X10 up to 800 Vpp (±400 V)
Battery: Lithium-ion 3.7 V, 1500 mAh; power via USB Type-C (5 V/1 A)
Dimensions: approx. 90 × 142 × 27.5 mm; Weight: 186 g
How to use
Connect the appropriate probe to the input and select the required coupling (AC or DC) and vertical sensitivity. Use the time base and trigger controls to stabilise the waveform on the 2.8-inch screen; automatic measurement functions provide common parameters such as Vpp, frequency and RMS. For component testing, insert the component into the test socket or apply the test clips and follow the on-screen prompts for automatic identification and parameter readout. To generate test signals, choose a waveform type, set frequency, amplitude and fill factor, then connect the generator output to the circuit under test. Charge the device via the USB-C port and note that automatic sleep mode helps extend battery life between uses.
Usage recommendations
Use the Anti-Burn protection as intended and verify probe selection (X1/X10) before measuring high-voltage signals. When testing components, observe polarity for diodes and transistors and ensure the device is charged to avoid interrupted measurements.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Fnirsi products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Fnirsi service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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