1. Introduction
The DROK USB Digital Multimeter is a versatile electrical tester designed to measure voltage, current, capacity, and power for various USB devices. It features dual USB ports (USB-A and USB-C) and offers 7 different display modes for comprehensive monitoring of your charging and power delivery systems. This manual provides detailed instructions for the proper setup, operation, and maintenance of your device.
2. Key Features
- 7 Display Modes: Easily switch between modes to measure voltage, amperage, capacitance, and power.
- Dual Color LED Display: Bright red and blue display for clear visibility of charging voltage and current.
- Dual USB Output: Features two USB outputs for simultaneous use. Output I supports both charging and data transfer, while Output II is dedicated to charging only.
- Multifunctionality: Includes capacitance check, capacitance clearing, over-voltage and low-voltage alarms, over-current, and short-circuit alarms.
- Intelligent Charging Control: Output II incorporates a built-in IC for automatic current matching, suitable for various devices including BC1.2, YT/D1591-2009, iPad, iPhone, and Samsung Galaxy.
3. Technical Specifications
| Input Voltage Range | 3.20V - 15.0V |
| Voltage Resolution | 0.01V (<10V); 0.1V (>/= 10V) |
| Measuring Current Range | 0.00A - 3.00A (10A max, not for prolonged 10A use) |
| Current Resolution | 0.01A |
| Capacitance Measurement | 0 - 99999mAh |
| Power Test Range | 0.00W - 9.99W - 99.9W |
| Measurement Accuracy | 0.1% (+3 Characters) |
| Operating Current | <20mA |
| Measurement Rate | >500ms/Per |
| Operating Temperature | -10°C to 65°C |
| Operating Humidity | 10-80% (Non-condensing) |
| Operating Pressure | 80-106kPa |
| Dimensions | 9.91 x 5.51 x 3.61 cm |
| Item Weight | 41 g |
The image below illustrates the various operating parameters and environmental conditions for the USB tester.
Figure 3.1: Operating Specifications
4. Setup
To begin using your DROK USB Digital Multimeter, follow these steps:
- Connect to Power Source: Plug the USB-A or USB-C input of the tester into a compatible power source (e.g., wall charger, power bank, computer USB port).
- Micro USB Adapter for PD Chargers: If connecting to a Power Delivery (PD) charger via the Type-C input and no display appears, insert the included Micro USB adapter into the Micro USB input port on the tester. Then, connect the PD charger to the Type-C input. The screen should light up.
- Connect Device: Plug the device you wish to test (e.g., smartphone, tablet) into either Output I (USB-A or USB-C) or Output II (USB-A) of the tester.
The following video demonstrates the unboxing and initial connection of the USB tester, including how to address scenarios where the display does not immediately light up with certain chargers.
Video 4.1: USB Tester Unboxing and Initial Setup
This video demonstrates the contents of the package, including the USB tester, micro USB adapter, user manual, and storage case. It also shows how to connect the tester to a power source and a device, highlighting the use of the micro USB adapter for PD chargers if the display does not activate immediately.
The image below illustrates the various input and output ports of the USB tester, along with the location of the control buttons.
Figure 4.1: Inputs, Outputs, and Buttons Overview
5. Operation
5.1 Display Modes
The DROK USB Digital Multimeter offers 7 display modes, which can be cycled through using Button II. These modes provide different combinations of measurements:
- Fixed Display Modes:
- 1. VA (Voltage & Current): Displays real-time voltage and current.
- 2. C (Capacity): Displays accumulated charge capacity (mAh).
- 3. P (Power): Displays real-time power (Watts).
- Cyclic Display Modes: These modes automatically cycle through combinations of the fixed displays.
- 4. VA+C
- 5. VA+P
- 6. C+P
- 7. VA+C+P
The image below illustrates the various display modes available on the USB tester, showing examples of voltage, current, capacity, and power readings.
Figure 5.1: Multi-Function Display Modes
5.2 Button Functions
The tester features two buttons for control:
- Button I (PD 5V Trigger): When the input voltage is >/= 5V, press this key for 5 seconds to trigger the output while powering up. This is primarily for activating PD output.
- Button II (Display Mode Switching & Capacity Clearing):
- Short Press: Changes the screen interface/display mode.
- Quick Double-Click: Resets the accumulated capacity (mAh).
- Quick Three-Click: Resets the accumulated electric energy (Wh).
- Long Press: Resets the accumulated capacity, power, and time data.
5.3 Dual USB Output Functionality
The tester provides two distinct output ports:
- Output I (USB-A & USB-C): This output supports both charging and data transfer. The charging current is determined by the compatibility of the connected device and charger. You can observe both voltage and current values simultaneously.
- Output II (USB-A): This output is for device charging only. It features a built-in intelligent charging control IC that automatically matches the most suitable and safe current for your devices. This is particularly useful for non-original chargers but also works with original chargers.
Note: When using QC 2.0 charging via Output I, do not insert any devices into Output II simultaneously.
The image below highlights the USB A/C port, demonstrating the versatility of the tester for different USB cable types.
Figure 5.2: USB A/C Port
6. Maintenance
To ensure the longevity and accurate performance of your DROK USB Digital Multimeter, observe the following maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the device. Avoid using abrasive cleaners or solvents that could damage the casing or display.
- Storage: Store the tester in a cool, dry place, away from direct sunlight and extreme temperatures. The provided storage case can help protect it from dust and physical damage.
- Handling: Handle the device with care. Avoid dropping it or subjecting it to strong impacts.
- Environmental Conditions: Do not expose the device to direct sunlight during operation, as this can affect display readability and potentially internal components. Ensure operation within the specified temperature and humidity ranges.
7. Troubleshooting
The DROK USB Digital Multimeter includes several alarm functions to help identify potential issues:
- Overvoltage Alarm: If the voltage exceeds or equals 5.6V, the digital voltage display will flash quickly. This indicates a potentially unsafe voltage level from the power source. Disconnect immediately.
- Lack of Voltage Alarm: If the voltage drops below a safe operating threshold, a lack of voltage alarm will activate. Check the power source and connections.
- Overcurrent Alarm: If the current exceeds or equals 3A, the digital current display will flash quickly. This suggests the connected device is drawing too much current, or there's an issue with the power source or cable.
- Short Circuit Alarm: In the event of a short circuit, the current digital display will flash quickly. Immediately disconnect all components to prevent damage.
If the display does not light up upon connection, ensure the Micro USB adapter is used when connecting to PD chargers via the Type-C input, as described in the Setup section.
The image below illustrates the multiple protection features integrated into the USB tester, which help prevent damage from electrical anomalies.
Figure 7.1: Multiple Protection Features
8. Safety Information
Please read and understand all safety information before using this product to prevent injury or damage to the device or connected equipment.
- Do not disassemble or modify the device. Unauthorized modifications can lead to malfunction, electric shock, or fire.
- Keep the device away from water, moisture, and other liquids.
- Avoid exposing the device to extreme temperatures, direct sunlight, or high humidity.
- Do not use the device if it appears damaged or is not functioning correctly.
- Ensure that the power source and connected devices are compatible with the tester's specifications to avoid overloading.
- Keep out of reach of children.
9. Warranty and Support
For warranty information and customer support, please refer to the documentation included with your product or contact DROK customer service directly. Typically, warranty details cover manufacturing defects and are valid for a specified period from the date of purchase. For technical assistance or inquiries, please visit the official DROK website or contact their support channels.