1. Product Overview
The Uni-Trend UT677C is a professional battery internal resistance tester designed for assessing the condition of various rechargeable batteries, including lead-acid and lithium types. It accurately measures internal resistance and voltage using the AC four-terminal method, ensuring precise results without interference from lead resistance. This device is essential for battery production, installation, and maintenance applications.
Key features include:
- Battery internal resistance measurement (0-3Ω, 4 ranges)
- Voltage measurement (0-120V for UT677C)
- Manual and automatic measurement modes
- PC software and Bluetooth APP support for data analysis
- Rechargeable 2600mAh lithium battery
- Fast response time (200ms) and quick test duration (2s)
- Data hold and storage for up to 500 sets of readings
- Automatic power off and low battery indication
- Strong anti-interference capabilities
2. Setup Instructions
2.1 Unpacking and Inspection
Upon receiving your UT677C, carefully unpack all components. Verify that the package contains the main unit, test leads (red and black probes), power adapter, USB cable, and user manual. Inspect the device and accessories for any signs of damage. If any damage is found or components are missing, contact your supplier immediately.
2.2 Charging the Battery
The UT677C is equipped with a rechargeable 2600mAh lithium battery. Before first use, or if the low battery indicator appears, connect the device to the provided power adapter using the USB cable to charge. The charging indicator on the device will show the charging status. Ensure the device is fully charged for optimal performance.
2.3 Connecting Test Leads
Connect the red and black test leads to the corresponding input terminals on the UT677C. Ensure a secure connection to prevent inaccurate readings. The four-terminal method requires two leads for current injection and two leads for voltage sensing, which are integrated into the provided test probes.
3. Operating Instructions
3.1 Power On/Off
To power on the device, press and hold the power button until the display illuminates. To power off, press and hold the power button again. The device also features an auto power-off function after 15 minutes of inactivity to conserve battery life.
3.2 Basic Measurement (Internal Resistance and Voltage)
The UT677C can measure both battery internal resistance and voltage. Connect the test leads to the battery terminals, ensuring correct polarity (red to positive, black to negative). The device will automatically detect the measurement type or can be manually set. The AC four-terminal method is used for accurate internal resistance measurement.
The UT677C can also function as a DC voltmeter. Connect the middle two red and black interfaces to measure DC voltage. Ensure you do not measure AC voltage or DC voltage exceeding 120V.
3.3 Threshold Settings and Alarms
You can set thresholds for resistance and voltage to determine pass, warning, or failure states. The resistance threshold range is 0-3000mΩ, and the voltage threshold range is 0-120.0V. The alarm function can be configured to provide a buzzer prompt (sound) when a test is completed, indicating pass, fail, or warning conditions.
3.4 Data Hold and Storage
Press the 'HOLD' button to freeze the current measurement on the display. The device can store up to 500 sets of measurement data. Use the 'MEM' button to access and manage stored data. Refer to the on-screen menu for navigation and data retrieval.
3.5 Bluetooth and PC Software Connection
The UT677C supports Bluetooth connectivity for pairing with a mobile application and a PC software for advanced data analysis and management. Refer to the specific instructions provided with the Bluetooth APP and PC software for detailed connection and usage procedures. This allows for real-time monitoring and comprehensive reporting of battery conditions.
4. Maintenance
4.1 Cleaning
To clean the device, use a soft, dry cloth. For stubborn dirt, a slightly damp cloth with mild detergent can be used, ensuring no liquid enters the device. Do not use abrasive cleaners or solvents.
4.2 Battery Care
To prolong the life of the rechargeable lithium battery, avoid fully discharging it frequently. Charge the battery regularly, especially if the device will be stored for an extended period. If storing for a long time, charge the battery to approximately 50% and recharge every few months.
4.3 Storage
Store the UT677C in a dry environment with a temperature range of -20°C to 60°C and relative humidity below 70% RH. Keep the device away from direct sunlight, extreme temperatures, and corrosive gases. Use the provided carrying case for protection during storage and transport.
5. Troubleshooting
This section addresses common issues you might encounter with your UT677C.
- Device does not power on: Ensure the battery is charged. Connect the device to the power adapter and try again. If the issue persists, the battery may need replacement or there could be an internal fault.
- Inaccurate readings: Check that the test leads are securely connected to both the device and the battery terminals. Ensure the battery terminals are clean and free of corrosion. Verify that the correct measurement mode is selected (if applicable).
- Bluetooth connectivity issues: Ensure Bluetooth is enabled on both the UT677C and your mobile device/PC. Make sure the device is within range and not paired with another device. Restart both the tester and the connecting device.
- Display not working correctly: If the screen is blank or shows garbled characters, try restarting the device. If the problem continues, contact customer support.
- Auto power-off too soon: Check the auto power-off settings in the device menu. It is set to 15 minutes by default.
If you encounter problems not listed here or if troubleshooting steps do not resolve the issue, please contact customer support.
6. Technical Specifications
The following table provides detailed technical specifications for the Uni-Trend UT677C Battery Internal Resistance Tester.
| Parameter | Specification (UT677C) |
|---|---|
| Battery Internal Resistance | 0.000mΩ~3mΩ / ±1%fs. ±20dgt (Resolution: 1µΩ) 3.000mΩ~30mΩ / ±0.5%fs. ±15dgt (Resolution: 10µΩ) 30.00mΩ~300mΩ / ±0.5%fs. ±15dgt (Resolution: 100µΩ) 300mΩ~3Ω / ±0.5%fs. ±15dgt (Resolution: 1mΩ) |
| Battery Voltage Range | 0.000V~7V / ±0.2%fs. ±10dgt (Resolution: 1mV) 7V~100.00V / ±0.2%fs. ±10dgt (Resolution: 10mV) 100V~120.00V / ±0.2%fs. ±10dgt/100mV (Resolution: 100mV) |
| Battery Types | Lead-acid battery, lithium battery, and other types of batteries |
| Measurement Method | Internal resistance: 1KHz AC 4-terminal test method; Open circuit terminal voltage: 3V max |
| Test Current | 2.0mA~200mA (Varying range corresponds to varying test currents) |
| Refresh Rate | 5 times/s |
| Anti-interference | Yes, Automatic frequency tuning: 920Hz~1080Hz |
| Power Supply | DC 11.1V lithium battery 2600mAh |
| Max Input Voltage | DC 120V (between positive side and negative side) |
| Response Time | 200ms |
| Screen | 3.5" (480 x 320 color screen) |
| Meter Dimension (L x W x H) | 170 x 115 x 65mm |
| Data Interface | Type C, save the testing data and upload it to PC |
| Bluetooth | Yes |
| Data Hold | Auto/Manual data hold |
| Data Storage | 500 sets |
| Measurement Judgment Function | PASS, WARNING, FAIL judgment thresholds can be preset |
| Low Battery Indication | Yes, 5 battery level |
| Auto Power Off | Yes, Around 15 minutes |
| Weight (meter) | 674.0g (batteries included) |
| Accuracy Guaranteed Temperature Humidity | 23°C±5°C, <75%RH |
| Working Temperature | -10°C~40°C, below 80%RH |
| Storage Temperature | -20°C~60°C, below 70%RH |
| Puncture Test | AC 3700V/RMS (between circuit and case) |
| External Magnetic Field | <40A/m |
| Suitable for Safety Regulations | IEC 61010; CE certificated |
7. Warranty and Support
7.1 Warranty Information
The Uni-Trend UT677C Battery Internal Resistance Tester comes with a 1-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or improper operation. Please retain your proof of purchase for warranty claims.
7.2 Customer Support
For technical assistance, warranty claims, or any questions regarding the operation of your UT677C, please contact your authorized Uni-Trend dealer or the manufacturer's customer service department. Refer to the contact information provided in your product packaging or on the official Uni-Trend website.
