1. Introduction
The DollaTek TC66 is a compact and versatile USB-C PD (Power Delivery) trigger, voltage, current, capacity, and power meter. It is designed to provide real-time monitoring of charging status and various electrical parameters for USB-C devices. This device is ideal for testing chargers, power banks, mobile phones, laptops, and other USB-C digital peripheral products.
Key features include a 0.96-inch HD color IPS LCD, bidirectional current measurement, 6-digit measurement resolution, offline data storage, and support for various fast-charge protocols. It also offers PC software connectivity for advanced control and data logging (APP functionality for TC66C model only).
2. Product Overview and Components
The TC66 features a clear display and essential ports for comprehensive testing.

Image 2.1: DollaTek TC66 USB Tester with labeled components. This image highlights the Type-C Male connector, Type-C Male Protection Cap, Micro USB Port, Type-C Female port, Protection Film, and PC Material Pane.
- Type-C Male Connector: Connects to the power source (e.g., charger, power bank).
- Type-C Female Port: Connects to the device being charged or tested (e.g., phone, laptop).
- Micro USB Port: Used for connecting to a PC for software control and firmware updates.
- Protection Film: A protective layer over the display, which can be removed.
- PC Material Pane: The transparent casing protecting the internal components.
- Type-C Male Protection Cap: A cap to protect the male USB-C connector when not in use.

Image 2.2: DollaTek TC66 USB Tester with Power Supply Switch and PD Switch labeled. This image shows the location of the Power Supply Switch (1) and the PD Switch (2) on the side of the device.
- Power Supply Switch: Controls the power to the device.
- PD Switch: Used for Power Delivery related functions, such as triggering specific voltages.
3. Setup and Basic Operation
3.1 Initial Connection
- Connect the Type-C Male connector of the TC66 to your power source (e.g., wall charger, power bank, computer USB-C port).
- Connect your device (e.g., smartphone, tablet, laptop) to the Type-C Female port of the TC66 using a compatible USB-C cable.
- The TC66 display will automatically power on and begin showing real-time measurement data.
3.2 Navigating the Display
The TC66 features a 0.96-inch HD color IPS LCD that displays various parameters. Use the physical buttons (K1, K2, if present, typically on the side) to cycle through different display screens or functions. The display typically shows:
- Voltage (V)
- Current (A)
- Capacity (mAh/Wh)
- Energy (Wh)
- Power (W)
- Equivalent Impedance (Ω)
- Temperature (°C/°F)
3.3 Fast Charge Protocol Triggering
The TC66 supports various fast-charge protocols, allowing you to test chargers and cables for compatibility and performance.

Image 3.1: DollaTek TC66 USB Tester demonstrating fast charge protocol triggering. The display shows USB PD/QC3.0/2.0/AFC/FCP trigger information, indicating the device's ability to detect and trigger various quick charge voltages.
The system automatically detects whether the current power supply equipment supports protocols like USB PD, QC3.0/2.0, AFC, FCP, and others. It can trigger 5V/9V/12V/20V and other quick charge voltages, which is useful for testing the performance of chargers and data cables.
4. PC Software and APP Control
The DollaTek TC66 can be connected to a computer for advanced monitoring and control using dedicated PC software. For the TC66C model, a mobile APP is also available.

Image 4.1: DollaTek TC66 USB Tester connected to PC software interface. The image shows the PC software displaying real-time testing data such as Voltage, Current, Power, Resistance, and Temperature, along with a graph of voltage and current over time. Note: The PC software is compatible with WIN7 64-bit and above.
4.1 Connecting to PC Software
- Download and install the appropriate PC software from the manufacturer's website.
- Connect the TC66 to your computer using a Micro USB cable via the Micro USB Port on the tester.
- Launch the PC software. It should detect the device and display real-time testing data.
The PC software allows you to check real-time testing data, view graphs, and access most functions of the tester conveniently. Please note that the PC software only supports Windows 7 64-bit and above operating systems.
For the TC66C model, a mobile application is available for wireless connection and control.
5. Firmware Update
The TC66 supports automatic firmware updates to ensure optimal performance and access to new features.

Image 5.1: DollaTek TC66 USB Tester firmware update process. The image shows the PC software interface during a firmware update, with a progress bar and instructions. The tester's screen displays "BOOTLOADER UPDATING...".
5.1 Automatic Firmware Update Procedure
- Ensure the TC66 is disconnected from any power source or device.
- Press and hold the K1 button (if present, typically the left button) on the tester.
- While holding K1, connect the tester to your computer using a Micro USB cable.
- Wait for the computer to recognize the device and for the PC software to display "device inserted".
- In the PC software, navigate to the firmware update section and click "Firmware Upgrade".
- Do NOT click "connect" during the firmware upgrade process.
- Follow the on-screen prompts until the upgrade is complete. The tester will restart automatically.
6. Application Scenarios
The TC66 is a versatile tool for monitoring charging status and protecting charging equipment across various applications.

Image 6.1: DollaTek TC66 USB Tester application scenarios. This image illustrates various uses for the TC66, including testing with chargers, power banks, car chargers, mobile phones, laptops, data cables, and electronic loads.
It can be used for the detection of chargers, power banks, and other charging equipment, displaying a variety of data on one screen to meet diverse testing requirements. It is widely used in the quality inspection of Type-C port 3C digital peripheral products and is a valuable tool for digital enthusiasts and electronics hobbyists.
7. Maintenance
7.1 Cleaning
- Gently wipe the device with a soft, dry cloth.
- Do not use liquid cleaners or solvents, as they may damage the display or internal components.
7.2 Storage
- Store the TC66 in a cool, dry place, away from direct sunlight and extreme temperatures.
- Keep the protection cap on the male USB-C connector when not in use to prevent dust and damage.
7.3 Handling Precautions
- Avoid dropping the device or subjecting it to strong physical shocks.
- While the device is designed to handle various loads, it may generate heat during operation, especially under high power. This is normal, but ensure adequate ventilation. Some users have reported temperatures exceeding 50°C, which is within operational limits but should be noted.
8. Troubleshooting
8.1 No Display / Device Not Powering On
- Ensure the Type-C Male connector is securely plugged into a working power source.
- Verify that the power source is providing sufficient voltage (minimum 3.5 Volts).
- Check the Power Supply Switch (if applicable) to ensure it is in the 'ON' position.
8.2 Incorrect or Unstable Readings
- Ensure all connections are firm and free from debris.
- Try using different cables or power sources to rule out external factors.
- If possible, test with a known good device or charger to compare readings.
8.3 PC Software Connection Issues
- Verify that your operating system is Windows 7 64-bit or above.
- Ensure the Micro USB cable is functioning correctly and securely connected.
- Reinstall the PC software and drivers if necessary.
- Important Note: Some users have reported that the PC software or firmware files might be flagged as suspicious by antivirus programs. Exercise caution and ensure you download software only from official or trusted sources.
9. Specifications
Detailed technical specifications for the DollaTek TC66 USB Tester.

Image 9.1: DollaTek TC66 USB Tester dimensions. The image shows the physical dimensions of the device: approximately 49mm (length), 22mm (width), and 8mm (thickness).
| Feature | Specification |
|---|---|
| Model Number | TC66 |
| Brand | DollaTek |
| Display | 0.96-inch HD Color IPS LCD |
| Measurement Type | Ammeter, Voltmeter, Ohmmeter, Capacity, Energy, Power, Temperature |
| Minimum Operating Voltage | 3.5 Volts |
| Maximum Rated Temperature | 113 Degrees Fahrenheit (45 Degrees Celsius) |
| Power Source | Cable Electric (USB-C powered) |
| Device Dimensions (approx.) | 49mm x 22mm x 8mm |
| Item Weight | 8 Grams |
| Color | Black |
| Fast Charge Protocol Support | QC2.0, QC3.0, APPLE 2.4A / 2.1A / 1A / DCP, 0.5A, Android SAMSUNG, USB PD |
| PC Software Compatibility | Windows 7 64-bit and above |
10. Warranty Information
Detailed warranty information for the DollaTek TC66 is not explicitly provided in the product data. For specific warranty terms and conditions, please refer to the documentation included with your purchase or contact the seller directly.
11. Support
If you encounter any issues or have questions regarding the DollaTek TC66 USB Tester that are not covered in this manual, please contact the retailer or manufacturer for assistance. Ensure you have your product model number (TC66) and purchase details available when seeking support.