1. Introduction
The UNI-T UT312A is a handheld vibration tester designed for precise measurement of vibration acceleration, velocity, and displacement in mechanical equipment. This device is an essential tool for equipment inspection in various industrial sectors such as power, metallurgy, and petrochemicals, offering a wide measurement range, user-friendly operation, and portability.
Key features include a 2.4-inch TFT color display with an auto-rotating screen, high/low frequency acceleration modes, data hold function, and a built-in rechargeable lithium battery. Its ergonomic design ensures comfortable handling and ease of use in diverse environments.
Video: Overview of the UNI-T UT312A Digital Vibration Meter in operation.
2. Product Features
- Measurement Modes: Measures vibration acceleration (PEAK), velocity (RMS), and displacement (P-P).
- Frequency Range: Supports both low (10Hz-1kHz) and high (1kHz-15kHz) frequency acceleration measurements.
- Display: 2.4-inch TFT color screen with automatic rotation for multi-directional observation.
- Battery: Built-in 1350mAh/3.7V rechargeable lithium battery, charged via Type-C interface.
- Convenience: Data hold function, LCD backlight, and integrated flashlight for use in dark environments.
- Power Management: Automatic power-off after 5 minutes of inactivity to conserve battery.
- Probes: Interchangeable long and short probes, and a U-type magnetic sucker (UT312A only) for versatile application.
Image: Visual representation of the UT312A's core features.
3. Package Contents
The standard package for the UT312A Digital Vibration Meter includes:
- Vibration tester (1 PC)
- User manual (1 PC)
- Safety instructions (1 PC)
- Long probe (1 PC)
- Short probe (1 PC, typically installed on the vibration tester)
- USB-C charging cable (1 PC)
- U-type magnetic sucker (1 PC, for UT312A only)
Image: Contents of the UT312A package.
4. Appearance and Controls
The UT312A is designed for ergonomic handling and ease of access to its functions. Below is a diagram illustrating the main components and controls:
Image: Labeled diagram of the UT312A's appearance and controls.
- Probe: Interchangeable long or short probe, or magnetic sucker, connected to the sensor.
- Sensor: Detects vibrations from the object under test.
- Flashlight: Provides illumination for measurements in low-light conditions.
- Display Screen: 2.4-inch TFT color screen showing measurement data and settings.
- Power Button/Measurement Button: Used to power the device on/off and initiate measurements.
- Power Off Key/Mode Key: Controls power off and switches between measurement modes.
- Flashlight Key/Lock Screen Key: Activates the flashlight and locks the screen.
- Type-C Charging Port and Indicator Light: For charging the internal battery and indicating charging status.
5. Setup
5.1 Charging the Device
- Locate the Type-C charging port on the device.
- Connect the provided USB-C charging cable to the device and a compatible DC 5V power source (e.g., a USB wall adapter or computer USB port).
- The charging indicator light will illuminate to show that the device is charging.
- A full charge typically takes approximately 3 hours. The device has a 1350mAh/3.7V lithium battery, providing about 12 hours of continuous operation.
Image: UT312A connected for charging.
5.2 Attaching Probes
The UT312A comes with interchangeable probes and a magnetic sucker to suit various measurement needs:
- Short Probe: Suitable for general vibration measurement in a wide range of objects. It is often pre-installed.
- Long Probe: Primarily used for measurements in narrow or special access areas where the short probe cannot reach.
- U-type Magnetic Sucker (UT312A only): Provides a stable attachment to ferromagnetic surfaces for consistent readings.
- To attach a probe or magnetic sucker, carefully screw it onto the sensor connection point at the top of the device until secure. Ensure a firm connection for accurate readings.
Image: Different probes and magnetic sucker for the UT312A.
6. Operating Instructions
6.1 Power On/Off
- Power On: Press the Power button. The screen will light up, and the device will be ready for use.
- Power Off: Press and hold the Power Off key/Mode key, or the device will automatically power off after 5 minutes of inactivity.
6.2 Selecting Measurement Modes
The UT312A supports three primary measurement modes:
- Acceleration (PEAK): Measures the peak vibration acceleration.
- Velocity (RMS): Measures the root mean square vibration velocity.
- Displacement (P-P): Measures the peak-to-peak vibration displacement.
Press the Mode key to cycle through these measurement modes. The selected mode will be indicated on the display.
Image: Display examples for Acceleration, Velocity, and Displacement modes.
6.3 High/Low Frequency Acceleration
When in Acceleration mode, you can switch between high and low frequency ranges:
- LO (Low Frequency Mode): 10Hz-1kHz
- HI (High Frequency Mode): 1kHz-15kHz
Use the appropriate button (refer to the device's interface for exact labeling, typically the Mode key or a dedicated frequency button) to toggle between these frequency ranges for acceleration measurements.
Image: High/Low frequency acceleration modes display.
6.4 Data Hold Function
To freeze the current measurement reading on the screen, press the Data Hold button (often labeled 'HOLD' or integrated with another function key). Press it again to release the hold and resume live measurements.
6.5 Using the Flashlight
The built-in flashlight can be activated by pressing the Flashlight key. This is useful for illuminating the measurement point in dimly lit environments.
Image: Flashlight function in use.
6.6 Auto-Rotating Screen
The 2.4-inch TFT color screen automatically rotates to ensure optimal viewing of data from any angle, enhancing usability during measurements.
Image: Auto-rotating screen in action.
7. Specifications
| Parameter | Range | Frequency | Resolution | Accuracy |
|---|---|---|---|---|
| Acceleration (PEAK) | 0.1-199.9 m/s² | LO: 10Hz-1kHz HI: 1kHz-15kHz | 0.1 m/s² | ±(10%+2 digits) |
| Velocity (RMS) | 0.1-199.9 mm/s | 10Hz-1kHz | 0.1 mm/s | ±(10%+2 digits) |
| Displacement (P-P) | 0.001-1.999 mm | 10Hz-1kHz | 0.001 mm | ±(10%+2 digits) |
| Automatically rotatable screen | Yes | |||
| High/Low frequency acceleration | Yes | |||
| Datahold | Yes | |||
| Flashlight | Yes | |||
| LCD type | 2.4" TFT color screen, full view | |||
| LCD backlight | Yes | |||
| Auto power off | 5 minutes without operation | |||
| Probes | Long and short probes (optional), magnetic sucker (UT312A only) | |||
| Battery indication | Yes | |||
| Battery type | 1350mAh/3.7V lithium battery | |||
| Charging interface | Type-C | |||
| Charging voltage | DC 5V | |||
| Charging time | About 3h | |||
| Battery duration | About 12h | |||
| Operating temperature and humidity | 0°C~40°C, ≤80%RH non-condensing | |||
| Storage temperature | -20°C~60°C | |||
| Product size (with short probe) | 180 × 28 × 64 mm | |||
| Product weight (with short probe) | About 159 g | |||
8. Maintenance
8.1 Cleaning
To ensure the longevity and accuracy of your UT312A, keep it clean. Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these may damage the casing or screen.
8.2 Storage
When not in use, store the vibration meter in a cool, dry place, away from direct sunlight and extreme temperatures. The recommended storage temperature is -20°C to 60°C. Ensure the probes are clean and securely stored to prevent damage.
8.3 Battery Care
The built-in lithium battery should be charged regularly, even if the device is not in frequent use, to maintain battery health. Avoid fully discharging the battery for extended periods.
9. Troubleshooting
- Device does not power on: Ensure the battery is charged. Connect the device to a charger and try again.
- Inaccurate readings: Check that the probe is securely attached and making good contact with the surface being measured. Ensure you are using the correct measurement mode and frequency range for your application.
- Screen is blank or frozen: Try restarting the device by holding down the power button. If the issue persists, ensure the battery is charged.
- Flashlight not working: Check if the flashlight key has been pressed correctly. Ensure the device has sufficient battery charge.
10. User Tips
- For consistent and reliable measurements, always ensure the probe is held perpendicular to the surface of the object being tested.
- When measuring in tight spaces, utilize the long probe. For flat, ferromagnetic surfaces, the magnetic sucker can provide a more stable contact than handheld probes.
- Take multiple readings at the same point and average them to minimize potential errors from momentary fluctuations or user handling.
- Familiarize yourself with the typical vibration characteristics of your equipment during normal operation to establish a baseline for comparison when troubleshooting.
11. Warranty and Support
The UNI-T UT312A Digital Vibration Meter typically comes with a 12-month warranty from the date of purchase. Please refer to your purchase documentation or contact the manufacturer/seller for specific warranty terms and conditions.
For technical support, service, or inquiries regarding your device, please contact UNI-T customer service or your authorized dealer. Keep your proof of purchase handy when seeking support.
