OSS U18 Fast Charging Tester User Manual

1.0 Product Introduction

The OSS U18 Voltage and Current Tester is a highly reliable and safe USB voltage and current detection meter, also functioning as a mobile communication terminal fast charging trigger instrument with high reliability and safety. It features a 1.77-inch TFT LCD display screen and integrates USB-A, Micro-USB, and Type-C interfaces. Utilizing an external 16-bit ADC and a dedicated PD protocol physical chip, the U18 can measure the power supply or consumption of USB interfaces, mobile phone chargers, U disks, and other devices. It can also measure the charging power of mobile phones and the input/output status of mobile power supplies, and test various fast charging protocols of chargers.

This manual provides essential safety information, warning tips, and solutions for common issues. Please read all contents carefully and adhere to all warnings and precautions.

2.0 Safety Precautions

• The monitoring interface should not be connected to a power supply exceeding 24V.
• Do not connect a power supply exceeding 16V to the PC online port.
• Only one pair of monitoring interfaces (one input port and one output port) can operate simultaneously. When one pair is active, do not connect equipment to other monitoring interfaces (except for the PC online port, which can connect to an external power supply).
• When using the fast charging trigger module, do not connect any equipment that cannot withstand high voltage to any monitoring interface.
• After using the PD trigger function, ensure the PD communication switch is returned to the OFF position.
• When operating at high power, the instrument's temperature will rise. Exercise caution to prevent scalding.
• Do not charge a mobile phone immediately after fast charging has been triggered. The manufacturer is not responsible for any damage to the mobile phone caused by this action.

3.0 Product Key Switch and Interface

The OSS U18 features multiple input/output ports and control buttons for versatile operation.

Figure 1: Product Key Switch and Interface Diagram

1. Input monitoring port: USB-A, 5-PIN male connector
2. Input monitoring port: TYPE-C, 16-PIN Female connector
3. Input monitoring port: Micro-USB, 5-PIN Female connector
4. Output monitoring port: USB-A, 5-PIN Female connector
5. Output monitoring port: TYPE-C, 16-PIN Female connector
6. PC online port: TYPE-C, 16-PIN Female connector
7. ENTER Switch
8. KEY+ Switch (Long press to flip the display interface)
9. KEY- Switch
10. BACK Switch
11. PD communication switch

4.0 Operating the Display Interfaces

The U18 offers several display modes to visualize charging data.

4.1 Simple Interface Mode

This mode provides a clean, basic display of voltage, current, and power.

Figure 2: Simple Interface Mode

4.2 Detailed Display Interface

This interface shows comprehensive data including voltage, current, power, capacity (Ah), energy (Wh), CC1/CC2 voltages, D+/D- voltages, protocol information, and cable resistance.

Figure 3: Detailed Display Interface

4.3 Ripple and Voltage-Current Curve Interface

This mode allows for the visualization of voltage and current waveforms, useful for analyzing stability and quality of power delivery.

Figure 4: Ripple and Voltage-Current Curve Interface (Waveform 1)

Figure 5: Ripple and Voltage-Current Curve Interface (Waveform 2)

Operating Instructions: Click the "ENTER" key to pause waveform or curve acquisition. Press and hold the "ENTER" key to switch between the ripple interface and the voltage and current interface. Press and hold the "KEY +" key or the "KEY-" key to switch the time base.

5.0 Cable Internal Resistance Measurement

The U18 can measure the internal resistance of cables using the differential pressure method. This requires a constant current load.

Figure 6: Cable Internal Resistance Measurement Interface

Operating Instructions: Use the differential pressure method to measure the internal resistance of the wire. It needs to be used together with the constant current load. Click the "ENTER" key to use the current voltage and current value as the reference value.

Measurement Steps:

1. Connection Mode 1 (Reference Value): Connect the charger + UPM-1 + constant current load (adjust current to approximately 0.5-1A). Record the reference voltage and current values.
2. Connection Mode 2 (Measurement): Connect the charger + cable + UPM-1 + constant current load (adjust current to approximately 0.5-1A, ensuring it's close to the current used for the reference value). The system will automatically calculate the internal resistance of the cable.

6.0 Fast Charging Protocol Trigger

The U18 supports triggering various fast charging protocols to test charger compatibility and performance.

Figure 7: Fast Charging Protocol Trigger Menu

Operating Instructions: Click "ENTER" to activate the menu. Use "KEY +" or "KEY-" to select the desired fast charging protocol (PD, QC2.0, QC3.0). Then click "ENTER" to initiate the trigger.

If a warning message appears (e.g., "High voltage, Don't connected Device."), continue to click "ENTER" to proceed or "BACK" to cancel the trigger.

6.1 PD Protocol

After entering the PD protocol interface, use the "KEY +" or "KEY-" buttons to select the desired voltage and current from the list. If selecting the PPS (Programmable Power Supply) position, click "ENTER" to enter the voltage adjustment selection. If "1000 (MV)" is selected, continue to use "KEY +" or "KEY-" to adjust the voltage in 1000mV steps.

6.2 QC 2.0 Protocol

After entering the QC 2.0 protocol interface, use the "KEY +" or "KEY-" buttons to select the voltage. Note that some chargers may only support up to 9V or 12V. If a selected voltage (12V or above) does not trigger, it indicates the charger does not support it.

6.3 QC 3.0 Protocol

After entering the QC 3.0 protocol interface, use the "KEY +" or "KEY-" buttons to increase or decrease the voltage in 200mV steps. Similar to QC 2.0, if a selected voltage (12V or above) does not trigger, the charger does not support it.

To return to the main interface from any protocol triggering interface, click "BACK".

7.0 System Settings

The U18 allows customization of various system parameters.

Figure 8: System Settings Interface

Operating Instructions: Long press the "BACK" key from any main interface to enter the system settings. Use "KEY +" or "KEY-" to select a setting item. Click "ENTER" to access the selected item. Once inside, use "KEY +" or "KEY-" to adjust the parameters. Click "ENTER" again to save changes and exit the setting item (the system may restart if certain parameters are changed). To cancel and exit without saving, click "BACK".

8.0 Computer Operation and Software

The U18 can connect to a computer for advanced data logging and analysis using dedicated software.

Figure 9: Computer Software Interface (Real-time Data)

Figure 10: Computer Software Interface (Voltage/Current Curves)

8.1 Connection and Real-time Data Display

Connect the U18 to your computer using a TYPE-A to TYPE-C data cable, connecting to the computer's USB port and the U18's USB-HID interface. Then, connect the charger you wish to monitor to the U18's monitoring interface. The software will automatically detect and display relevant data.

8.2 Drawing Voltage and Current Curves

In the software's "Chart" section, click "Start" to begin plotting the voltage and current curves. You can adjust the sampling rate (up to 100Sa/s) using the drop-down list next to "Sampling Rate". Click "Stop" to halt the curve plotting. After stopping, you can click and drag the curve with the left mouse button to pan, and use the mouse wheel to zoom in/out.

8.3 Data Management

• Click "Save Chart" to save the curve data to your computer.
• Click "Import Data" to load previously saved curve data into the software's chart interface.
• Click "Clear Chart" to clear the current curve data from the interface.

8.4 Power Statistics

In the "Power Statistics" section, click "Start" to begin collecting power statistics. The statistical duration is shown next to "Time". Use the drop-down list next to "Power" to select the unit (mAh or mWh). Click "Reset" to clear the statistics.

9.0 Specifications (Technical Indicators)

The following table outlines the technical specifications of the OSS U18 Fast Charging Tester:

Dimensions: 80*35*13mm

Operating Temperature: 0-50°C

Power Supply: DC (6-24V DC Voltage range)

Display Type: Digital Only

10.0 User Tips

• For accurate cable internal resistance measurements, ensure the constant current load is stable and the current values are consistent between reference and measurement steps.
• When testing fast charging protocols, always verify the charger's supported voltages to avoid issues.
• If the device becomes unresponsive, try performing a "Factory Reset" through the System Settings menu.
• The device is useful for checking the quality of charging cables and power adapters. A significant voltage drop or high internal resistance in a cable can indicate poor quality.

11.0 Troubleshooting

• No Display/Power: Ensure the device is correctly connected to a power source within the 6-24V DC range. Check all connections.
• Incorrect Readings: Verify that only one pair of monitoring interfaces is active at a time. Disconnect any unused monitoring interfaces.
• Fast Charging Not Triggering: Confirm the charger supports the selected fast charging protocol (PD, QC2.0, QC3.0). Some chargers have specific voltage limitations. Ensure the PD communication switch is in the correct position.
• Device Overheating: If the device feels excessively hot during high-power operation, disconnect it immediately and allow it to cool down. Ensure proper ventilation.
• Software Connection Issues: Ensure the correct TYPE-A to TYPE-C data cable is used and connected to the USB-HID interface. Restart the software and/or the computer if necessary.

12.0 Warranty and Support

This product is designed for reliability and performance. For any technical support or warranty inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.

13.0 Product Demonstration Video

Watch this video for a visual guide on how to use the OSS U18 Fast Charging Tester and its various functions.