FNB48P USB Fast Charge Tester

FNB48P USB Fast Charge Tester is a compact and versatile USB measurement tool designed for testing fast chargers, USB cables, power banks, mobile devices, USB-C PD power supplies and other USB-powered equipment. It allows real-time monitoring of voltage, current, power, accumulated capacity, consumed energy, charging protocols, cable resistance and other important electrical parameters.

The tester integrates USB-A, USB-C and Micro-USB interfaces, making it suitable for both traditional USB-A chargers and modern USB Type-C Power Delivery systems. It is a practical instrument for electronics technicians, service centers, product testing, cable diagnostics, power bank capacity checks and fast charging protocol analysis.

⚡ Key Features

• 🔌 USB-A, USB-C and Micro-USB interfaces
• 📟 Color TFT LCD display
• 🎯 High-resolution measurement up to 0.00001 V / A / W
• 📊 Voltage, current, power, capacity and energy measurement
• 🚀 Fast charging protocol detection and triggering
• 🔋 Power bank and charger testing
• 🔁 PD protocol monitoring and conversion
• 🧠 PD E-Marker cable reading
• 🧵 USB cable resistance measurement
• 💾 Data recording function
• 🌡️ Internal temperature monitoring
• 📈 Waveform / curve display
• 🧭 Automatic screen orientation switching
• 🔄 PC firmware upgrade support

🧪 Application

FNB48P is useful when you need to check whether a charger really supports the advertised fast charging modes, how much power a USB cable can deliver, whether a USB-C cable contains an E-Marker chip, what the real capacity of a power bank is, or which charging protocol is currently used by a phone, tablet or other device.

The tester can display live values and also record minimum, maximum and average voltage, current and power values. It can calculate capacity in Ah and energy in Wh, monitor operation time and help identify voltage drop or cable losses during charging.

🚀 Supported Fast Charging Protocols

FNB48P supports detection and triggering of multiple popular fast charging protocols:

• QC2.0
• QC3.0
• Huawei FCP
• Huawei SCP
• Samsung AFC
• USB Power Delivery / PD
• PD2.0 / PD3.0 trigger functions
• VOOC / WARP constant-voltage trigger
• SuperVOOC
• Apple 2.4A acceleration mode
• MTK-PE automatic detection

📋 Technical Specifications

Parameter	Value
Model	FNB48P
Product type	USB fast charge tester / USB voltage, current and power meter
Interfaces	USB-A, USB-C, Micro-USB
Display	Color TFT LCD display; exact size should be verified according to version / batch
ADC	External 16-bit ADC
Voltage measurement range	4–24 V
Voltage resolution	0.00001 V
Voltage accuracy	±(0.2‰ + 2)
Current measurement range	0–6.5 A
Current resolution	0.00001 A
Current accuracy	±(0.5‰ + 2)
Power measurement range	0–156 W
Power resolution	0.00001 W
Power accuracy	±(0.5‰ + 2)
Load equivalent internal resistance	0–9999.9 Ω
Internal resistance resolution	0.0001 Ω
D+/D− voltage range	0–3.3 V
D+/D− voltage resolution	0.001 V
D+/D− voltage accuracy	±(1.0% + 2)
Capacity measurement	0–9999.99 Ah
Energy measurement	0–9999.99 Wh
Cable resistance measurement	0–9999.9 Ω
Temperature measurement	°C / °F
Record time	up to 99 d 23 h 59 min 59 s
Equipment running time	up to 99 d 23 h 59 min 59 s
PC connection	Micro-USB for computer connection / firmware upgrade
Additional functions	PD Listener, E-Marker reading, DASH cable reading, data recording, protocol detection

🔌 Interfaces and Controls

FNB48P provides multiple input and output ports for convenient testing of chargers, cables and USB-powered devices:

• USB-A input
• USB-C / Type-C input
• Micro-USB input
• USB-A output
• USB-C / Type-C output
• Micro-USB PC port
• PD communication switch
• Function buttons
• Touch control

📊 Measurement and Analysis

The main screen can display real-time voltage, current and power. In recording mode, the tester can also show working time, internal temperature, capacity, energy and statistical values such as minimum, maximum and average readings.

Cable resistance measurement helps identify poor-quality USB cables, excessive voltage drop or charging problems. This is especially useful when fast charging does not activate or when a device charges slower than expected.

✅ Advantages

• Suitable for USB-A and USB-C chargers
• Helps verify fast charging protocols
• Displays both real-time and accumulated data
• Useful for service work, laboratory testing and everyday diagnostics
• Helps identify low-quality USB cables
• Supports PD E-Marker cable reading
• Compact and portable format
• Clear color display

📦 Typical Uses

• USB charger testing
• USB-C PD power supply diagnostics
• Power bank capacity testing
• Phone and tablet charging analysis
• USB cable quality inspection
• Fast charging protocol diagnostics
• Electronics repair and service work
• Hobby and laboratory measurements

⚠️ Notes

• Do not use the tester with power supplies exceeding the specified voltage range.
• Only one monitoring input / output pair should be active at the same time.
• When using PD trigger, monitor, conversion or E-Marker functions, follow the manufacturer’s instructions.
• Technical parameters may vary depending on device version or firmware update.