UNI-T UT181A True RMS Datalogging Multimeter Instruction Manual

1. Product Overview

The UNI-T UT181A is an industrial-grade True RMS Datalogging Multimeter designed for high-precision measurements in various professional applications. It features advanced functionalities such as VFC (Voltage Frequency Converter) and Low-Pass Filtering, making it suitable for complex electrical systems. Its robust design ensures reliability in demanding environments.

Figure 1: Front view of the UNI-T UT181A True RMS Datalogging Multimeter, showcasing its large color TFT LCD and control buttons.

2. Key Features

• True RMS Measurement: Provides accurate readings for non-sinusoidal waveforms.
• Datalogging Capability: Stores up to 20,000 data points for trend analysis and data comparison.
• High-Resolution Display: Features a 3.5-inch 64k color TFT LCD with 60,000 counts for clear visibility.
• Dual Temperature Measurement: Supports simultaneous temperature readings.
• Low-Pass Filtering (LPF): Essential for accurate measurements on variable frequency drives (VFDs).
• VFC (Voltage Frequency Converter): Measures AC voltage and frequency accurately in noisy environments.
• Connectivity: Equipped with USB and Bluetooth for PC communication and app integration.
• Robust Design: IP65 rated for dust and water resistance, with a shock-proof housing for severe environments.
• Power: Powered by a 2000mAh Li-ion battery, ensuring extended operation.
• Measurement Functions: Includes AC/DC voltage, AC/DC current (up to 10A), resistance, capacitance, conductivity, diode, continuity test, frequency, duty cycle, and non-contact AC voltage (NCV) detection.
• Advanced Functions: Max/Min/Average, Peak Hold, Relative Measurement, Store/Recall functions, and real-time date and time.

3. What's in the Box

The UNI-T UT181A package includes the following items:

• UNI-T UT181A Datalogging Multimeter
• Test Leads (Red and Black)
• USB Interface Cable
• PC Software CD
• Temperature Adapter with 2K Type Thermocouples
• Charging Cable with Adapter
• English User Manual
• Carrying Case
• Li-ion Battery (pre-installed or included separately)

Figure 2: The UNI-T UT181A multimeter displayed with its complete set of accessories, including test leads, cables, temperature probes, and carrying case.

4. Setup

4.1 Battery Installation

The UT181A is powered by a rechargeable Li-ion battery. Ensure the battery is properly installed before first use. The battery compartment is located on the rear of the device.

1. Locate the battery compartment cover on the back of the multimeter.
2. Use a screwdriver to open the battery compartment.
3. Insert the Li-ion battery, ensuring correct polarity.
4. Securely close the battery compartment cover.

Figure 3: Close-up view of the battery compartment on the back of the UT181A, showing battery and fuse specifications.

4.2 Charging the Battery

Connect the provided charging cable to the multimeter and a suitable power adapter. The multimeter cannot be used while charging.

4.3 PC and Bluetooth Connectivity

The UT181A supports both USB and Bluetooth communication for data transfer and remote monitoring. The USB interface allows synchronization with a Windows operating system for data logging and analysis. An optional Bluetooth adapter (UT-D07A) can be used for wireless connectivity to increase measurement safety by allowing remote operation.

5. Operating Instructions

5.1 Power On/Off

Press and hold the power button (usually marked with a circle and a vertical line) for approximately 3 seconds to turn the multimeter on or off. The display will show a boot-up sequence.

5.2 Function Selection

Rotate the central rotary dial to select the desired measurement function. Use the blue "SELECT" button to toggle between different modes within a single rotary switch position (e.g., AC/DC voltage, resistance/continuity).

5.3 Measurement Functions

• Voltage (AC/DC/Low-Z): Select the appropriate voltage range (V~ for AC, V- for DC, Lo-Z V~ for low impedance AC).
• Current (AC/DC): Select A~ or A- for current measurements. Ensure test leads are connected to the correct current input jacks (10A, mA, or µA).
• Resistance (Ω): Measures electrical resistance.
• Capacitance (F): Measures capacitance. The UT181A has a maximum capacitance range of 60mF.
• Continuity Test: Used to check for open or closed circuits (audible beep for continuity).
• Diode Test: Checks the functionality of diodes.
• Frequency (Hz) / Duty Cycle (%): Measures the frequency and duty cycle of AC signals.
• Temperature (°C/°F): Use the provided temperature adapter and thermocouples for temperature measurements.
• Non-Contact Voltage (NCV): Detects AC voltage without direct contact.

5.4 Data Logging and Analysis

The UT181A can log up to 20,000 data points. Connect the multimeter to a PC via USB or Bluetooth (with optional adapter) to transfer and analyze logged data using the provided software. The software allows for trend capture and data comparison.

Figure 4: The UT181A multimeter actively measuring electrical parameters in an industrial setting.

6. Maintenance

6.1 Cleaning

Regularly clean the multimeter's casing with a soft, damp cloth. Do not use abrasive cleaners or solvents. Keep the display clean and free from scratches.

6.2 Battery Care

To prolong battery life, charge the Li-ion battery regularly and avoid fully discharging it. If storing the multimeter for an extended period, ensure the battery is partially charged.

6.3 Fuse Replacement

If the multimeter fails to measure current or shows incorrect readings in current modes, the fuse may need replacement. Refer to the specifications for the correct fuse type (e.g., F10A H 1000V, F0.8A H 1000V). Always disconnect test leads and power before opening the fuse compartment.

7. Troubleshooting

7.1 Communication Issues

If the multimeter fails to establish communication with a PC or mobile device via USB or Bluetooth, ensure the communication settings are correctly configured in the multimeter's setup menu. Some firmware versions may require re-enabling communication after each power cycle. Verify that the correct drivers are installed on your PC.

7.2 Inaccurate Readings

Check the battery level, ensure test leads are properly connected, and verify that the correct measurement function and range are selected. For current measurements, inspect the fuses. If issues persist, consult the detailed troubleshooting section in the full user manual or contact UNI-T support.

8. Specifications

Figure 5: A detailed table outlining the electrical specifications and features of the UNI-T UT181A multimeter.

9. Warranty and Support

The UNI-T UT181A comes with certifications including CE, UKCA, and cETLus, ensuring compliance with international safety and quality standards. UNI-Trend, the manufacturer, is committed to providing high-quality products and offers spare part availability for 4 years in the EU. For technical support, warranty claims, or service, please contact your local distributor or the official UNI-T support channels.

Manufacturer: UNI-Trend

Certifications: CE, ISO 9001, RoHS, UKCA, cETLus

EU Spare Part Availability Duration: 4 Years