FNIRSI FNAC-28 USB Tester with PD Trigger

FNIRSI FNAC-28 USB Tester: The Essential Tool for Power Testing, DIY Electronics, and Mobile Repair

The FNIRSI FNAC-28 USB tester is quickly becoming a must-have device for anyone working with battery chargers, power banks, flashlights, DIY electronics, mobile repair, or USB power management. If you are building circuits, troubleshooting charging issues, or fine-tuning your mobile workstation, this powerful yet compact USB tester offers exceptional accuracy and real-world usability.

In this post, we’ll dive deep into how the FNIRSI FNAC-28 USB tester works, what makes it stand out, and why it’s perfect for hobbyists, mobile technicians, and power users who need reliable data from their USB devices.

Instant USB Power Testing with Real-Time Accuracy

The FNIRSI FNAC-28 USB tester is incredibly easy to use. Simply connect it between your charger and your device, and you will immediately see detailed live readings including:

• Voltage
• Current
• Power consumption
• Charging time
• Energy transfer in real-time

Its full-color TFT LCD screen with a wide viewing angle makes it easy to monitor readings from almost any position, whether you’re working on a tight lab bench, in a mobile repair shop, or at your home workspace.

Precision Matters: External 16-bit ADC for Reliable Results

Unlike basic USB testers, the FNIRSI FNAC-28 uses an external 16-bit ADC chip to deliver high-precision voltage and current measurements. This ensures:

• Minimal error margins
• Consistent, professional-grade readings
• Dependable data even during complex multi-voltage testing

The FNIRSI FNAC-28 USB tester can measure the power supply and consumption of various USB devices, including:

• USB wall chargers
• USB drives
• Phone charging ports
• Power banks (both input and output measurements)

Whether you’re checking if a power bank delivers the advertised capacity or verifying if a USB port is outputting sufficient current, this tester provides trustworthy results every time.

Automatic Fast-Charging Protocol Detection

The FNIRSI FNAC-28 USB tester can automatically detect fast-charging protocols across many popular standards, including:

• QC 2.0 / QC 3.0
• FCP / SCP
• AFC
• VOOC / WARP
• SVOOC 1.0 / SVOOC 2.0

There’s no need to toggle settings manually. Simply connect the tester, and it will identify the active protocol. This is especially useful for verifying whether your charger, power bank, or cable supports fast charging across multiple devices.

PD Trigger Function: Perfect for USB-C Power Delivery Testing

The built-in PD trigger function on the FNIRSI FNAC-28 allows you to quickly test whether a charger or power bank supports USB Power Delivery (PD) at specific voltage levels.

This is a key feature when working with modern USB-C devices like:

• Laptops
• Smartphones
• Flashlights
• USB-C powered accessories

You can verify that PD chargers deliver the expected voltages without requiring expensive lab equipment, making this tester a smart, accessible tool for both DIYers and repair professionals.

Ideal for Raspberry Pi, Arduino, ESP32, and DIY Bench Work

If you are working on Raspberry Pi, Arduino, ESP32, or other microcontroller projects, understanding power delivery is critical for stability and performance. The FNIRSI FNAC-28 USB tester is perfect for:

• Measuring supply voltage accuracy
• Monitoring current draw during startup and operation
• Profiling power usage of peripheral components

Whether you’re prototyping on a lab bench or setting up a mobile development kit, this USB tester can help prevent undervoltage issues and power-related component failures.

It’s an excellent companion for:

• Makers
• Hardware tinkerers
• Students in electronics labs
• Engineers troubleshooting embedded systems

Valuable for Mobile Phone Repair and Charger Output Verification

For mobile phone repair technicians, the FNIRSI FNAC-28 USB tester is an invaluable diagnostic tool. It helps with:

• Verifying the output of phone chargers
• Testing charging cables for internal resistance
• Diagnosing phone charging ports and power pathways

When you’re trying to determine whether a charging issue is caused by the cable, charger, or phone port, the FNIRSI FNAC-28 gives you instant clarity. You can also easily test and compare third-party chargers to see if they are delivering proper fast-charging protocols.

Power Testing Made Simple: For Everyday Users Who Love Their Gear

You don’t have to be an engineer, technician, or hardcore DIYer to use the FNIRSI FNAC-28 USB tester. In fact, it’s a fantastic tool for everyday tech enthusiasts who just want to get more value out of their chargers, power banks, and devices.

Wondering if Your Power Bank Delivers What It Promises?

If you’ve ever bought a power bank and thought, “Is this really charging my phone as fast as it should?”—this USB tester is for you.

With the FNIRSI FNAC-28, you can:

• Plug it into your favorite power bank and see real-time voltage, current, and charging speed.
• Easily compare different chargers to find out which one works best.
• Check whether your GaN charger is delivering fast-charging speeds as advertised.

The tester shows all this information in clear, colorful numbers on the display—no technical background needed.

Plan Smarter with Your Backup Power

If you use portable power stations, backup batteries, or plan for off-grid trips, this tester can help you:

• Measure how much power your USB-C monitor, tablet, or smartphone actually uses.
• Plan how long your backup power will last with real, tested numbers—not guesses.

For example:

• Connect your portable monitor to a power bank via the tester.
• Watch the power draw in real-time.
• Use this information to decide whether you need a larger power bank or can comfortably use your current setup.

It’s a fun, hands-on way to understand your power needs and make smarter decisions about the tech you already own or plan to buy.

No Special Skills Required

One of the best things about the FNIRSI FNAC-28 USB tester is that it’s beginner-friendly:

• Just plug it in, and it works.
• There’s no complicated setup or calibration.
• The automatic detection of fast-charging protocols means you don’t need to know the technical jargon to get valuable insights.

It’s a tool that grows with you—whether you’re just getting curious about your devices, or you eventually dive into more advanced projects with Raspberry Pi, Arduino, or mobile repairs.

Why Everyday Buyers Love It

• You can test your chargers and cables at home without needing to visit a repair shop.
• It helps you avoid buying fake or low-quality chargers that don’t actually fast-charge your devices.
• It empowers you to make smart choices when selecting new power banks or portable power stations.
• It’s a fun way to understand the power behind the gadgets you use every day.

So, whether you’re simply a gadget lover, a traveler who depends on backup power, or someone who wants to get the most from their charging gear—the FNIRSI FNAC-28 USB tester is your new best friend.

Ready to check your gear? Order the FNIRSI FNAC-28 USB tester here.

Multi-Functional Data Analysis

The FNIRSI FNAC-28 USB tester is more than a simple voltmeter. It offers advanced diagnostic features:

• Supports battery capacity testing
• Can store up to 5 sets of data for easy comparison
• Real-time power curve plotting
• Waveform pause function for detailed inspection
• Adjustable time base for long and short-duration tests

These tools help you track charging trends, detect voltage dips, and spot inconsistent power supplies over time. This is particularly helpful for verifying battery health in older devices or testing the endurance of power banks.

Accurate Cable Testing and Simulation Features

The FNIRSI FNAC-28 can also:

• Measure internal resistance of charging cables using the differential pressure method
• Simulate Apple 2.4A charging and DASH fast charging
• Read DASH cable information

This makes it ideal for quickly checking whether a cable is capable of supporting high-speed charging, which can help prevent customer complaints in retail or repair environments.

Bidirectional High Current Detection

This USB tester supports 6.5A bidirectional current detection, making it suitable for both supply and load testing on USB-A and USB-C ports. Whether you’re pushing power to a device or drawing it, the FNIRSI FNAC-28 gives you accurate readings in both directions.

Firmware Updates: Stay Current with New Features

One major advantage of the FNIRSI FNAC-28 is its firmware upgradability.
Software updates can be downloaded directly from the manufacturer’s official website at fnirsi.com.

Keeping your tester updated ensures that you always have the latest protocol support, bug fixes, and new diagnostic features. This adds long-term value and makes it a future-proof addition to your toolkit.

Frequently Asked Questions (FAQ)

1. Can the FNIRSI FNAC-28 USB tester be used for Raspberry Pi power testing?
Yes. It’s perfect for monitoring the voltage and current delivered to Raspberry Pi boards to avoid undervoltage errors and ensure stable operation.

2. Is it suitable for mobile phone charging port diagnostics?
Absolutely. The tester can quickly verify if the charging port is supplying the correct voltage and current, helping to diagnose mobile phone charging issues efficiently.

3. Can I test USB-C Power Delivery on laptops?
Yes. The PD trigger function allows you to confirm whether a USB-C charger is delivering the correct voltage profiles for laptops and other PD-compatible devices.

4. Does it support firmware upgrades?
Yes. Firmware updates are available at fnirsi.com to keep your USB tester up to date with the latest features.

5. Can the tester measure both charging and discharging currents?
Yes. The FNIRSI FNAC-28 supports bidirectional current detection, making it suitable for both charging and power output testing scenarios.

Final Thoughts

The FNIRSI FNAC-28 USB tester is a versatile, accurate, and user-friendly device that fits perfectly into the toolkits of:

• DIY electronics hobbyists
• Mobile repair technicians
• Power bank enthusiasts
• USB device developers
• Lab bench professionals

Whether you’re working with Raspberry Pi, Arduino, ESP32 boards, chargers, power banks, or mobile phones, the FNIRSI FNAC-28 USB tester provides fast, accurate, and actionable power data.

If you’re looking to get the most out of your charging equipment or ensure stable power delivery in your electronics projects, this is the tool to have.

You can explore more and purchase the FNIRSI FNAC-28 USB tester here.