FNIRSI FNAC-28 Type-C 2 IN 1 USB Tester

Description

The FNIRSI FNAC-28 is a pocket-sized USB power meter that measures voltage, current and power while also triggering fast charging protocols. This 2-in-1 design lets you test chargers, cables, power banks and USB devices without needing separate equipment.

What Does the FNAC-28 Do?

The FNAC-28 answers two common questions. First, how much power is my charger actually delivering? Second, is my cable capable of fast charging? One compact device handles both tasks.

Plug the tester between your charger and device. The screen displays real-time voltage, current and power readings. You see exactly what your phone, tablet or laptop receives during charging.

The quick charge trigger function activates specific voltage outputs from compatible chargers. Test whether your charger supports QC3.0, VOOC, or other protocols by triggering each one directly.

Measurement Capabilities

The FNAC-28 uses an external 16-bit ADC chip for high measurement accuracy. This precision matters when diagnosing charging problems or comparing charger performance.

Measurement Ranges

Voltage: 4V to 24V – covers standard USB 5V through to laptop USB-C power delivery

Current: 0A to 6.5A bidirectional – handles everything from trickle charging to high-power fast charging

Power: 0W to 156W – sufficient for phone chargers through to laptop adapters

Bidirectional current detection shows power flowing in either direction. A small arrow on screen indicates current flow direction. This helps when testing power banks that charge and discharge through the same port.

Fast Charging Protocol Support

The FNAC-28 detects and triggers multiple fast charging standards. Automatic detection identifies which protocols your charger supports without manual selection.

Supported Protocols

QC2.0 – triggers 5V, 9V, 12V or 20V output

QC3.0 – adjustable voltage from 3.4V to 20V

FCP (Huawei) – triggers 9V, 12V or 20V output

SCP (Huawei SuperCharge) – triggers 5.5V to 6.0V high-current mode

AFC (Samsung Adaptive Fast Charging) – triggers 9V or 12V output

VOOC/WARP (OnePlus/Oppo) – triggers 20V output

SVOOC 1.0 and SVOOC 2.0 – supported for super fast charging testing

This protocol coverage lets you verify charger capabilities before purchasing or troubleshoot why fast charging isn’t working with specific device combinations.

Cable Testing Features

Poor cables cause slow charging more often than faulty chargers. The FNAC-28 measures cable internal resistance using the differential pressure method. High resistance cables waste power as heat and limit charging speed.

Cable Detection Functions

Cable resistance measurement – identifies cables limiting charging current

DASH cable detection – verifies OnePlus/Oppo fast charging cable compatibility

Soft DASH cable support – tests flexible DASH cables

Apple 2.4A simulation – checks cables for iPad charging compatibility

These tests reveal whether your existing cables support fast charging or need replacing.

Data Recording and Display

The 1.06-inch colour TFT LCD provides clear readings at wide viewing angles. Despite the compact size, numbers remain readable in various lighting conditions.

Display Modes

Real-time voltage and current curves – see charging behaviour over time

D+/D- voltage curves – monitor USB data line voltages for protocol analysis

High-speed voltage and current curves – capture fast transients during protocol negotiation

Waveform pause – freeze display to examine specific moments

Adjustable time base – zoom in or out on curve displays

The device stores 5 sets of battery capacity data for comparing different charging sessions or power banks.

Interface Connections

The FNAC-28 integrates four connection points for maximum compatibility:

USB-A male (input) – connects to standard USB chargers and ports

USB-A female (output) – connects cables or devices with USB-A plugs

Type-C male (input) – connects to USB-C chargers and laptop ports

Type-C female (output) – connects USB-C devices and cables

This dual-interface design means one tester works with virtually any USB charging setup. No adapters needed for most common testing scenarios.

Practical Applications

Charger Testing

Verify actual output voltage and current under load. Compare claimed specifications against real-world performance. Identify counterfeit or degraded chargers before they damage devices.

Power Bank Evaluation

Measure input charging speed and output discharge capacity. Calculate actual usable capacity versus manufacturer claims. Monitor charging efficiency and heat-related losses.

Cable Quality Assessment

Test cables before purchase or diagnose slow charging problems. Identify high-resistance cables limiting fast charging performance. Verify fast charging cable compatibility with specific protocols.

Device Charging Analysis

Monitor phone and tablet charging profiles. Identify charging speed drops due to temperature throttling. Verify fast charging activation with specific charger and cable combinations.

Laptop USB-C Testing

Measure USB-C power delivery to laptops. Verify charger wattage meets laptop requirements. Test third-party chargers for compatibility and safety.

User Settings

The FNAC-28 offers practical customisation options:

Adjustable brightness – optimise screen visibility for different environments

Custom standby time – set auto-sleep delay to conserve power

Temperature units – switch between Celsius and Fahrenheit

Language selection – English and Chinese interfaces available

Firmware upgrades – update functionality via USB connection

What’s Included

• FNIRSI FNAC-28 USB Tester unit
• USB cable (USB-A to Type-C)
• User manual
• Colour packaging box

Limitations to Consider

The FNAC-28 does not support USB Power Delivery (PD) protocol detection or triggering. For testing USB-PD chargers and laptops requiring PD negotiation, consider the FNIRSI FNB58 which includes full PD support.

The 1.06-inch screen displays curves but detailed analysis benefits from the PC software connection for larger viewing.

UK Service

Orders dispatch within 1-2 business days via Royal Mail. Most UK addresses receive delivery in 24-48 hours.

All purchases include 30-day returns under UK Distance Selling Regulations. UK-based customer service responds within 1 business day for technical questions.

Technical Specifications

Parameter	Specification
Model	FNAC-28
Display	1.06″ colour TFT LCD
Voltage Range	4V to 24V
Current Range	0A to 6.5A (bidirectional)
Power Range	0W to 156W
ADC Resolution	16-bit external ADC
Interfaces	USB-A male/female, Type-C male/female
QC2.0 Trigger	5V / 9V / 12V / 20V
QC3.0 Trigger	3.4V to 20V adjustable
FCP Trigger	9V / 12V / 20V
SCP Trigger	5.5V to 6.0V
AFC Trigger	9V / 12V
VOOC/WARP Trigger	20V
SVOOC Support	1.0 and 2.0
Data Storage	5 groups
Cable Resistance	Supported
DASH Detection	Supported
Apple 2.4A	Supported
Languages	English, Chinese
Firmware Update	Via USB
Dimensions	73 × 36 × 12mm
Weight	21g