1. Ynlieding
The Diymore U-18 USB-C Tester is a versatile 2-in-1 device designed for monitoring USB-C power delivery, voltage, current, and other charging parameters. It features a 1.77-inch TFT color LCD screen for clear data display and supports various fast charging protocols, including PD and QC2.0/3.0. This manual provides comprehensive instructions for its safe and effective use.
Fideo 1: Oerview of the Diymore U-18 USB-C Tester. This video demonstrates the physical appearance and basic functionality of the device, showcasing syn kompakte ûntwerp en display.
2. Produkt Overview
2.1 Key Features
- Display mei hege definysje: 1.77-inch TFT screen shows real-time voltage, current, power, and charging data.
- Multi-protokol-stipe: Compatible with PD and QC2.0/3.0 charging protocols.
- Comprehensive Measurements: Monitors voltage (4-25V), current (up to 6.5A), power output, and charging protocols with ±0.1V/0.01A accuracy.
- Oanpasbere ynterface: Features 7 different display interfaces for various charging parameters and statistics.
- Avansearre diagnostyk: Measures wire internal resistance using the pressure difference method to evaluate charging efficiency and cable quality.
2.2 Komponinten en ynterface

Ofbylding 1: Diagram illustrating the various ports and control buttons on the Diymore U-18 USB-C Tester. This includes the Type-C Input, Type-C Output, USB-A Input, USB-A Output, USB-HID, Micro USB Input, and the control keys (ENTER, KEY-, KEY+, PD Communication Switch, BACK Key).
The U-18 tester features multiple input/output ports and control buttons:
- Type-C-ynfier: Connects to the power source (e.g., charger).
- Type-C útfier: Connects to the device being charged/tested.
- USB-A Input (4V-24V): Connects to a USB-A power source.
- USB-A Output (0-6.5A): Connects to a USB-A device being charged/tested.
- USB-HID: For data communication with a computer (if supported by firmware).
- Micro USB-ynfier: For external power supply or firmware updates.
- 1.77-inch TFT Color LCD Screen: Displays all measurement data.
- (1) ENTER Key: Befêstiget seleksjes of giet yn menu's.
- (2) KEY - Key: Navigates down or decreases values.
- (3) KEY + Key: Navigates up or increases values. (Long press to toggle display orientation)
- (4) PD Communication Switch: Activates/deactivates PD communication.
- (5) BACK Key: Gean werom nei it foarige skerm of menu.
3. Ynstelling en basisoperaasje
3.1 De tester ferbine
- Identify the appropriate input port (USB-A or Type-C) on the tester based on your power source.
- Connect the power source (e.g., wall charger, power bank) to the tester's input port.
- Connect the device you wish to test (e.g., smartphone, tablet) to the tester's corresponding output port (USB-A or Type-C).
- The tester's screen should illuminate and begin displaying real-time data.
3.2 Reading Basic Measurements

Ofbylding 2: Example of the tester's display showing various measurement data, including voltage, current, power, energy statistics, capacity statistics, and fast charging protocol information.
Upon connection, the main display will show key parameters:
- Voltage (V): The electrical potential difference.
- Aktueel (A): The flow rate of electric charge.
- Power (W): The rate at which electrical energy is transferred.
- Kapasiteit (Ah): Accumulated charge over time.
- Enerzjy (Wh): Accumulated energy over time.
- D+/D- Voltage: Data line voltages, useful for protocol detection.
- Protokol: Indicates detected fast charging protocols (e.g., QC2.0, QC3.0, PD).
4. Avansearre funksjes
4.1 Interface Navigation and Settings

Ofbylding 3: Various display interfaces and settings menus available on the Diymore U-18 USB-C Tester, including system settings, simple interface mode, cable measurement, and protocol detection/trigger options.
Brûk de YNGEAN, KEY -, KAART +, en RÊCH keys to navigate through different display interfaces and settings menus. A long press on the KAART + button can rotate the display orientation.
- Systeemynstellingen: Adjust display brightness, standby time, language, and perform a factory reset.
- Simple Interface Mode: Provides a streamlined view of essential data.
- Ripple/Voltage/Current Curve Interface: Displays real-time graphs of voltage en aktuele fluktuaasjes.
4.2 Cable Internal Resistance Measurement

Ofbylding 4: The tester performing a wire internal resistance measurement, displaying reference voltage/current, real voltage/current, difference, and calculated cable resistance.
To measure cable internal resistance:
- Navigate to the 'Cable Measurement' interface using the navigation keys.
- Connect the power source directly to the tester's input, and then connect the cable to be tested to the tester's output.
- The tester will employ the voltage drop method to measure the resistance, automatically calculating and displaying the cable resistance value. A lower resistance indicates a more efficient cable.
4.3 Fast Charging Protocol Detection and Trigger
The tester can automatically detect and trigger various fast charging protocols. Navigate to the 'Protocol Detection/Trigger' interface to:
- Automatyske deteksje: The tester will attempt to identify the fast charging protocol supported by the connected power source.
- Manuele trigger: You can manually select and trigger specific protocols like PD, QC2.0, or QC3.0 to test compatibility and performance.
5. Spesifikaasjes

Ofbylding 5: Detailed product specifications for the Diymore U-18 USB-C Tester, including measurement ranges, resolution, and accuracy for various parameters.
| Yndikator | Berik | Resolúsje | Krektens |
|---|---|---|---|
| Monitor Voltage | 4-24V | 0.00001V | ±(0.2%+2) |
| Monitor Current | 0-6.5A | 0.00001A | ±(0.5%+2) |
| Monitor Power | 0-156W | 0.00001W | ±(0.5%+2) |
| D+/D- Voltage | 0-3.3V | 0.001V | ±(1.0%+2) |
| Kapasiteit | 0-9999.99 Ah | 0.00001 Ah | - |
| Elektrisiteitskonsumpsje | 0-9999.99Wh | 0.00001wh | - |
| Cable Internal Resistance | 0-9999.9Ω | 0.0001Ω | - |
| Running Time of Equipment | 99 days 23:59:59 | 1 twadde | - |
| Rekordtiid | 1900/2/10 15:59:59 | 1 twadde | - |
Ofmjittings: 3.94 x 2.56 x 0.59 inch (L x B x H)
Power Boarne: USB-C
Bedriuwstemperatuerberik: 32°F oant 140°F (0°C oant 60°C)
6. Probleemoplossing
6.1 Display Not Lighting Up with Type-C PD

Ofbylding 6: Visual guide for troubleshooting when the tester screen does not light up with a Type-C PD connection, showing solutions like flipping the connector or using the built-in Type-C interface.
If the tester screen does not light up when connected to a Type-C PD power source:
- Flip the Type-C connector: Type-C connectors are reversible. Try unplugging and re-inserting the connector with the opposite orientation.
- Use the built-in Type-C interface: Ensure you are using the dedicated Type-C input/output ports on the tester for PD connections.
Noat: When the PD power supply is not connected to a fast charging device, it may not be powered by default.
6.2 Unkrekte mjittingen
- Soargje derfoar dat alle ferbiningen feilich binne en frij fan pún.
- Test with a different cable or power source to rule out external factors.
- Perform a factory reset via the system settings menu if persistent issues occur.
7. Safety Information
- Stel it apparaat net bleat oan ekstreme temperatueren, focht of direkt sinneljocht.
- Meitsje it apparaat te fallen of te ûnderwerpen oan sterke ynfloeden.
- Besykje it apparaat net te demontearjen of te wizigjen, om't dit de garânsje ûnjildich makket en skea of ferwûning feroarsaakje kin.
- Hâld bûten it berik fan bern.
8. Garânsje en stipe
Diymore products are designed for quality and reliability. This product comes with an 18-moanne garânsje from the date of purchase. We also offer a 30-dagen werom belied for any reason. For technical assistance or warranty claims, please contact Diymore customer support. Our team is available for 24-oere klant stipe to address any questions or concerns you may have.
Foar fierdere help, besykje asjebleaft de Diymore Store on Amazon.