1. Product Overview
The FNIRSI FNB38 is a high-reliability, high-security USB voltage and current detection meter designed for testing various USB charging parameters and fast charging protocols. It features a 1.44-inch TFT LCD HD color screen and is compatible with multiple interfaces including USB-A, Micro-USB, and Type-C.
Key functions include:
- USB 2.0 interface with 1.44-inch TFT LCD HD display.
- Integrated USB-A, Micro-USB, Type-C interfaces.
- External 16-bit ADC and PD protocol physical chip for precision.
- Drive-free PC upgrade capability.
- PD E-Marker read function.
- Fast charge recognition and deception.
- PD protocol monitoring and conversion.
- Precision measurement of voltage, current, and power.
- Data storage and intelligent recording of energy capacity detection.
2. Safety Information
Please read all safety warnings carefully before using the device to prevent damage to the tester or connected equipment.
- Do not connect a power supply exceeding 24V to the tester.
- The FNB38 USB-A input port supports high-power input (e.g., 20V * 5A = 100W).
- The USB-A output port can withstand 5A current for a short time.
- The Micro-USB input port does not support large current and high power; its input current cannot exceed 2.5A. When using high current and high power, it is recommended to use the Type-C female output.
- The HID-USB interface is exclusively for data transmission.
- When using high voltage and high power, the tester's temperature will rise. Exercise caution to prevent burns.
- When upgrading firmware, always confirm the model first. Using firmware from other models can lead to unexpected errors.
3. Setup and Connections
The FNB38 USB Tester features multiple input and output ports for versatile testing. Refer to the structural diagram below for port identification.
Connecting the Tester:
- Connect the power source (e.g., charger, power bank) to one of the input ports (USB-A, Type-C, or Micro-USB).
- Connect the device to be charged or tested to one of the output ports (USB-A or Type-C).
- The 1.44-inch TFT LCD will display real-time voltage, current, and other relevant data.
Note:
- Only one input and one output are allowed to be connected at the same time for testing.
- Some testers support high-voltage fast charging, and output input ports after high-voltage trigger. If there is high voltage, do not connect any equipment with insufficient voltage. Always confirm the display voltage is correct before connecting equipment.
4. Operating Instructions
Navigating the Interface:
The FNB38 features a user-friendly interface with dedicated buttons for navigation and function selection.
- ">>" button (6): Used for page navigation or selecting options.
- "<<" button (7): Used for page navigation or selecting options.
- "OK" key (8): Functions as a confirmation or function key.
Key Features and Measurements:
The FNB38 can perform a variety of measurements and protocol detections. The main display shows real-time data, and you can navigate through different screens to access specific functions.
Protocol Triggering:
The tester supports various fast charge protocol detections and triggers. This allows you to test if a charger or device is correctly implementing a specific fast charging standard.
- Fast charge protocol detection
- QC2.0 trigger
- QC3.0 trigger
- Huawei FCP trigger
- Huawei SCP trigger
- Samsung AFC trigger
- PD protocol trigger
Advanced Features (Firmware V1.30 and above):
Ensure your device firmware is updated to access these advanced functionalities.
- PD Protocol Monitoring: Debug PD protocol tool to fully understand the protocol process.
- PD E-Marker: Reads CC line information from cables with E-Marker chips.
- PD Protocol Conversion: Converts QC2.0 charging heads to PD2.0 charging heads for PD appliances.
Interface Preview:
The FNB38 offers various display screens to show different measurement data and settings.
Product Video Overview:
5. Maintenance
- Keep the device clean and free from dust and moisture. Use a soft, dry cloth for cleaning.
- Avoid dropping the device or subjecting it to strong impacts.
- Store the device in a cool, dry place when not in use.
- Firmware Updates: Regularly check for firmware updates to ensure optimal performance and access to new features. Firmware updates can be found at: FNB38 Firmware Update Tool. Always confirm the model before updating.
6. Troubleshooting
- No Display/Power: Ensure the power source is connected correctly and providing sufficient voltage (4-24V). Check cable connections.
- Incorrect Readings: Verify that only one input and one output are connected simultaneously. Ensure cables are in good condition.
- High Temperature: If the tester becomes hot during high voltage/power use, this is normal. However, if it becomes excessively hot, disconnect immediately and check for proper connections and power limits.
- Protocol Trigger Issues: Ensure your device's firmware is up to date (V1.30 or later for advanced PD features). If triggering high voltage, confirm the display voltage is correct before connecting the equipment.
- Firmware Update Errors: Always double-check that you are using the correct firmware for the FNB38 model. Using incorrect firmware can cause irreversible damage.
7. Specifications
Material: ABS
Color: Black
Product Size: 69mm (length) x 30mm (width) x 9.5mm (height)
Technical Index:
| Index | Range | Resolution | Accuracy |
|---|---|---|---|
| Input voltage | 4 ~ 24V | 0.1mV | ± (0.2‰ + 2) |
| Input Current | 0 ~ 5A | 0.1mA | ± (0.5‰ + 2) |
| Input power | 0 ~ 120W | 0.1mW | ± (0.5‰ + 2) |
| Load Equivalent Internal Resistance | 0 ~ 9999.9Ω | 0.1mΩ | ± (0.5‰ + 2) |
| D+/D- voltage | 0 ~ 3.3V | 0.01V | ± (1.0% + 2) |
| Equipment temperature | ℃, ℉ | 1℃, 1℉ | ± (1.2% + 3) for ℃, ± (1.2% + 4) for ℉ |
| Capacity | 0 ~ 9999.9mAh | 0.0001mAh | for reference |
| Energy used | 0 ~ 9999.99Wh | 0.00001Wh | for reference |
| Cable internal resistance | 0 ~ 9999.9Ω | 0.0001Ω | for reference |
| Equipment runtime | 999 hours 59 minutes 59 seconds | 1 second | 5 seconds / hour |
| Record time | 999 hours 59 minutes 59 seconds | 1 second | 5 seconds / hour |
8. User Tips
- Cable Quality Matters: When testing charging speeds or protocols, ensure you are using high-quality cables. Poor cables can significantly impact results and even limit fast charging capabilities.
- Monitor Over Time: Utilize the data storage and recording features to monitor charging behavior over extended periods. This can help identify intermittent issues or degradation in battery/charger performance.
- Understand Protocols: Familiarize yourself with the different fast charging protocols (QC, PD, FCP, SCP, AFC) to correctly interpret the tester's readings and ensure compatibility with your devices and chargers.
- Check E-Marker Cables: For Type-C to Type-C connections, especially with high power delivery, use the PD E-Marker function to verify cable capabilities and ensure it supports the desired power levels.
9. Warranty and Support
For any technical support, warranty claims, or further inquiries regarding your FNIRSI FNB38 USB Tester, please contact the manufacturer or your point of purchase.
Official firmware updates and tools can be found at: FNB38 Firmware Update Tool.
