The FNIRSI FNAC-28 is a versatile USB-A and USB-C connector tester that combines voltage, current, power measurement function and fast charging support in one compact device. Designed for testing chargers, cables, power banks and other devices powered by USB ports. Thanks to the 2 measurement inputs, the tester allows simultaneous examination of the charging parameters of different types of cables and devices, which increases its versatility. The color OLED screen displays all the key data: input voltage, current and amperage. These readings are visible in real time and easily accessible thanks to the intuitive menu and function buttons on the device housing.
The built-in 16-bit analog-to-digital converter (ADC) is responsible for the high accuracy of measurements, which is especially important for laboratory and service tests. The tester supports a current load of up to 6.5 A, and the USB-C port enables bidirectional current flow. This allows not only the measurement of performance parameters, but also the analysis of the quality of power transmission in both directions, which is crucial when testing devices equipped with the Power Delivery system.
The FNAC-28 automatically recognizes the most important fast charging protocols, including QC 2.0, QC 3.0, AFC, SCP, FCP, Apple 2.4A, VOOC, SVOOC and PE. When you plug in a charger or device, the tester displays a list of supported standards and voltage and current ratings. You can also activate the charging simulation, which allows you to check the compliance of the charger with a given standard and its actual performance.
With the cable testing function, FNAC-28 can not only detect damage, but also measure the resistance of the cable and evaluate its current carrying capacity. The tester also allows you to simulate the load on the device, so you can check whether the cable works properly under real load conditions. The device is capable of testing battery capacity, recording time, current and energy consumption. The FNAC-28 records up to five measurement data series, which are automatically stored in the device. This makes it easier to assess battery wear and test new cells before installing them in equipment.
The FNAC-28 allows you to adjust the brightness of the display, set the time to enter standby mode and select the temperature unit (°C/°F). In addition, the device supports switching the interface language between English and Chinese. The tester can also simulate standard charging profiles such as Apple 2.4A or DASH profiles, allowing comprehensive testing of power supplies without connecting additional devices. The tester can also display data in the form of graphs in three modes: classic - with real-time voltage and current, D+/D- line data in voltage analysis mode, and voltage disturbance analysis mode, which detects the instability of the power supply.

- Model FNAC-28
- Display 1.06 inches
- Voltage monitoring range 4-24 V
- Voltage resolution 0.001 V
- Voltage measurement accuracy ±(0.2‰ + 2)
- Current monitoring range 0-6.5 A
- The resolution of the current is 0.001 A
- Current measurement accuracy ±(0.2‰ + 2)
- Power monitoring range 0-156 W
- Power resolution is 0.001 W
- Accuracy of power measurement ±(0.2‰ + 2)
- Device temperature measurement (°C) Resolution 1°C, accuracy ±(1.2% + 3)
- Data update time 1 second
- Dimensions 73 × 36 × 12 mm
- Weight 21 g