FNIRSI C1 – USB-C PD Trigger & Smart Fast Charge Voltage Current Tester with Protocol Detection

The FNIRSI C1 is not just a basic USB-C tester — it’s a multi-protocol diagnostic powerhouse designed to uncover the full potential and behavior of your USB-C power sources and devices. Whether you’re an engineer validating USB PD voltages, a technician diagnosing faulty chargers, or a hobbyist exploring fast-charging behavior, the C1 gives you precise, real-time electrical data along with protocol detection support — all wrapped in a rugged, ultra-portable design.

In-Depth Feature Breakdown:

USB-C Power Delivery (PD) Trigger & Negotiation

• Supports USB PD 2.0 & PD 3.0, allowing the tester to trigger fixed voltage outputs (5V/9V/12V/15V/20V) from PD-enabled power supplies and adapters.

• Allows manual or automatic voltage negotiation, perfect for checking PD charger behavior across multiple voltage profiles.

• Displays exact voltage, current draw, wattage, and selected PDO (Power Data Object) in real time.

Comprehensive Fast-Charge Protocol Detection

• Auto-detects and displays charging protocols like:

  • Qualcomm QC 2.0/3.0/4.0+

  • Huawei FCP/SCP

  • Samsung AFC

  • Apple 2.4A

  • MTK PE

  • BC1.2, DCP, CDP, SDP, and more.

• Useful for testing compatibility of smartphones, power banks, or wall adapters with multiple device brands.

• Highlights the active protocol when a device is connected — helpful for confirming expected charging behavior.

Real-Time Monitoring & Data Accuracy

• Continuously monitors:

  • Voltage (V): 0V–24V

  • Current (A): 0A–5A

  • Power (W): 0W–100W+

  • mAh & mWh Accumulation: Tracks energy consumption over time

  • Load Resistance Display

• Perfect for measuring real-world power delivery efficiency, thermal draw, or battery capacity over charging sessions.

OLED Display – Ultra-Clear Visual Output

• 0.96” high-contrast color OLED display shows live metrics, protocol types, port directions, and negotiated voltages.

• Wide viewing angle and fast refresh for easy readability under various lighting conditions.

Built-In Safety & Protection

• Reverse current protection

• Over-voltage protection

• Over-current warning

• Power-down memory retention

• Short-circuit protection on USB input

Advanced Utility in Multiple Applications:

• ✔ Smartphone & Tablet Charging Verification
  Confirm which charging protocol is being used and whether the phone is receiving full power.

• ✔ Charger & Power Bank Testing
  Evaluate charger performance under load and confirm multi-voltage support with actual PD triggering.

• ✔ Cable Quality Testing
  Verify cable quality and resistance by monitoring current loss under load and voltage drop.

• ✔ Embedded Development & Repair Work
  Ideal for engineers and repair technicians needing precise voltage/current data for USB-C powered devices.

• ✔ Battery Charging Research & Optimization
  Use accumulated mAh/mWh readings to evaluate battery capacity or charging effectiveness over time.

Technical Specifications: