KWS-1902L Multi-function USB Type-C Tester User Manual

1. Introduction

The KWS-1902L is a versatile multi-function USB Type-C tester designed for real-time detection and monitoring of electrical charging status. It accurately measures voltage, current, power, capacity, and energy, making it an essential tool for digital players and electronics enthusiasts. Its compact design and high-definition display provide a clear and comprehensive overview of your Type-C devices' performance.

Figure 1: KWS-1902L Type-C Tester Overview

2. Key Features

• High-Definition TFT Display: Features a 0.96-inch TFT color screen that provides vivid, delicate, and natural display images from any angle.
• Multi-Screen Display: Three switchable display screens for comprehensive data viewing (Voltage/Current/Power, Capacity/Energy/Time, D+/D-/CC1/CC2/Max values).
• Power-Off Storage Function: Automatically stores capacity and energy data even when the power supply is disconnected, allowing for convenient subsequent viewing and energy measurement.
• Accurate Measurement: Utilizes a professional instrument sampling circuit and a unique accuracy algorithm for 4-digit precision, ensuring smaller and more accurate detection data errors.
• Wide Compatibility: Supports Type-C 24-pin interface, widely used for quality inspection of 3C digital peripheral products such as notebooks, cell phones, mobile power supplies, rechargers, car chargers, data cables, and electronic loads.
• Bidirectional Testing: Supports bidirectional connection mode for flexible testing scenarios.
• High Power Handling: Capable of testing up to 240W fast charging, with a maximum current of 12A.
• Compact and Portable: Small size (40 x 20 x 10 mm) and lightweight (approx. 12g) for easy carrying.

Figure 2: KWS-1902L Product Characteristics

3. Setup Guide

The KWS-1902L Type-C Tester is designed for plug-and-play operation. Follow these simple steps to begin monitoring your devices:

1. Connect to Power Source: Insert the male Type-C connector of the KWS-1902L tester into your Type-C power source (e.g., wall charger, power bank, computer's USB-C port).
2. Connect Your Device: Plug your Type-C charging cable into the female Type-C port of the KWS-1902L tester. Then, connect the other end of the charging cable to your device (e.g., smartphone, tablet, laptop).
3. Observe Display: The tester's screen will automatically light up and display real-time voltage, current, and power data as soon as a connection is established and power flows.

Figure 3: Typical Connection Setup

Figure 4: Bidirectional Connection Mode

4. Operating Instructions

4.1 Display Modes

The KWS-1902L features a 0.96-inch TFT display with three switchable screens to show various charging parameters:

• Screen 1: Displays real-time Voltage (V), Current (A), and Power (W).
• Screen 2: Displays accumulated Capacity (mAh), Energy (mWh), and elapsed Time (T).
• Screen 3: Displays D+ voltage, D- voltage, CC1 voltage, CC2 voltage, Maximum Voltage (Max-V), Maximum Current (Max-A), and Maximum Power (Max-W).

Figure 5: Multiple Display Screens

4.2 Key Operations

The single button on the tester controls its functions:

1. Tap once: To switch between the three display pages.
2. Double-click: To rotate the display page 180 degrees.
3. Hold down for 3 seconds: To clear the saved capacity (mAh) and energy (mWh) data.

Figure 6: Key Operation Instructions

4.3 Mobile Power Capacity Calculation

The KWS-1902L's power-off storage function allows for calculating mobile power capacity. Here are the methods:

1. Fully charge the mobile power supply and connect it to the KWS-1902L.
2. Clear the data (rst) on the tester by holding the button for 3 seconds.
3. Discharge the electrical appliance until it stops output.
4. Method 1 (mAh): Mobile power capacity (mAh) = Measured mAh * battery voltage / efficiency.
5. Method 2 (mWh): Mobile power capacity (mWh) = Measured mWh * battery voltage + efficiency.

Note: General mobile power output voltage is 5V, battery voltage is 3.7V, and efficiency is approximately 85%.

Figure 7: Mobile Power Capacity Measurement

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the tester. Do not use liquid cleaners or aerosols.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Avoid dropping or subjecting the tester to strong impacts. Do not attempt to disassemble or modify the device, as this will void any potential warranty.

6. Troubleshooting

• No Display or Incorrect Readings:
  • Ensure all Type-C connections are secure and fully inserted.
  • Verify that the power source (charger, power bank) is active and providing power.
  • If the issue persists with a specific charging head or device, it might indicate an incompatibility. Please note the model of the charging head for reference.
• Data Not Clearing:
  • Make sure you are holding the button down for a full 3 seconds to initiate the data clear function. A quick press will only switch pages.

7. Specifications

Figure 8: Product Parameter Table

8. User Tips

• Long-Term Monitoring: Utilize the power-off storage feature to track the total charge capacity and energy delivered to devices like power banks or for long charging sessions. This helps in assessing battery health and charger efficiency over time.
• Comprehensive Diagnostics: Don't just stick to the main voltage/current/power screen. Cycle through all three display modes to gain deeper insights, especially the D+/D-/CC1/CC2 voltages, which can be crucial for diagnosing fast charging protocols and cable quality.
• Portability: Given its small size, keep the tester handy in your tech bag. It's an excellent tool for quickly checking charging performance on the go, especially when using unfamiliar chargers or cables.
• Cable Testing: Use the tester to compare different Type-C cables. A significant drop in voltage or current with a particular cable might indicate a low-quality or damaged cable.

9. Warranty and Support

For any technical assistance, warranty claims, or support inquiries regarding your KWS-1902L Multi-function USB Type-C Tester, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.

10. Product Video