1. Introduction
Thank you for choosing the FNIRSI KWS-1902C or KWS-MX18L USB DC Tester. These devices are designed to accurately measure and monitor various electrical parameters of USB power sources and connected devices, including voltage, current, power, capacity, energy, resistance, and temperature. They are essential tools for diagnosing charging issues, evaluating power banks, and testing USB cables.
2. Product Models
This manual covers two models: the KWS-MX18L (standard USB-A interface) and the KWS-1902C (USB Type-C interface). Both models offer similar functionality with differences primarily in their physical connectors.
3. Setup and Connection
The USB DC Tester is designed for simple plug-and-play operation. Follow these steps to set up your device:
- Identify Ports: Locate the input port (usually the male connector) and the output port (usually the female connector) on your tester.
- Connect to Power Source: Plug the input port of the tester into a USB power source (e.g., wall charger, power bank, computer USB port).
- Connect Device: Plug the device you wish to test (e.g., smartphone, tablet, USB fan) into the output port of the tester using its charging cable.
- Monitor Display: The tester's screen will immediately light up and begin displaying real-time measurements.
4. Operating Instructions
The tester features a single button for controlling its functions and display modes.
- Viewing Data Sets: Press the button briefly to cycle through 1-9 sets of stored charging data. This allows you to track different charging sessions or devices.
- Deleting Data: To clear the current data set, press and hold the button for 3 seconds. This will reset the accumulated capacity and energy readings for that specific group.
- Rotating Screen: Double-click the button quickly to rotate the screen display. This is useful for viewing the screen comfortably from different angles or orientations.
5. Specifications
| Feature | KWS-MX18L | KWS-1902C |
|---|---|---|
| Product Model | KWS-MX18L | KWS-1902C |
| Voltage Range | 4-30V | 4-30V |
| Current Range | 0-5A | 0-5A |
| Power Range | 0-150W | 0-150W |
| Capacity Range | 0-999999mAh | 0-999999mWh |
| Energy Range | 0-999999 mAh (cumulative) | 0-999999mWh |
| Time Range | 0-99 hours | 0-99 hours |
| Internal Temperature | 0-80°C | 0-80°C |
| Load Resistance | 0-999.9 Ω | 1-9999.9 Ω |
| Voltage Resolution | N/A | 0.002A |
| Current Resolution | N/A | 0.002A |
| Positive Voltage | 0-10V | N/A |
| Negative Voltage | 0-10V | N/A |
| Display | 0.96 inch color screen | 0.96 inch color screen |
| Product Interface | USB-A | USB-C 24pin |
| Dimensions | 55x26.5x11.5mm | 55x26.5x11.5mm |
| Product Weight | 40 grams (approx.) | 15 grams (with packaging) |
| Testing Direction | Unidirectional | Two-way |
| Certification | CE | CE |
| Accuracy Class | High | High |
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the tester in a cool, dry place away from direct sunlight and extreme temperatures.
- Handling: Avoid dropping the device or subjecting it to strong impacts, as this may damage the internal components or the display.
7. Troubleshooting
- No Display: Ensure the tester is correctly plugged into a functioning USB power source and a device is connected. Check if the power source is active.
- Inaccurate Readings: Verify that all connections are secure. Try using different cables or power sources to rule out external factors.
- Button Unresponsive: Ensure the button is not stuck. If the device is frozen, try disconnecting and reconnecting it.
8. User Tips
- For the most accurate readings, ensure the tester is connected directly between the power source and the device, avoiding additional hubs or long cables.
- Utilize the data group feature to compare the charging performance of different chargers or cables over time.
- The screen rotation function is particularly handy when working in tight spaces or with awkward angles.
- Pay attention to the temperature reading, especially when fast charging, to ensure devices are not overheating.
9. Warranty and Support
Specific warranty information for this product may vary by region and retailer. Please refer to your purchase documentation or contact the seller for details regarding warranty coverage and technical support. Keep your proof of purchase for any warranty claims.
