1. Introduction
The UNI-T UT161 series comprises reliable True RMS digital multimeters designed for professional electrical measurements. This series includes models UT161B, UT161D, and UT161E, offering display counts of 6000 (UT161B/D) and 22,000 (UT161E). These multimeters are capable of measuring up to 1000V AC/DC and feature audible and visible alarms to provide warnings, especially when measuring high voltage, current, or temperature.
Key Features:
- True RMS measurement
- Data hold and backlight function
- Max/Min/Relative mode for data analysis
- USB communication for data transfer
- Robust input protection
- Diode and continuity test capabilities
- NCV (Non-Contact Voltage) with audible/visual alarm
Product Overview Video
Video: An overview of the UNI-T UT161 series digital multimeters, showcasing their features and applications.
2. Safety Information
Always observe safety precautions when using the multimeter to prevent electric shock or personal injury. Improper use can also damage the meter.
- Read and understand all instructions in this manual before use.
- Do not apply more than the rated voltage, as marked on the meter, between terminals or between any terminal and earth ground.
- Use caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC. These voltages pose a shock hazard.
- Inspect test leads for damaged insulation or exposed metal. Replace if damaged.
- Ensure the function switch is in the correct position for the measurement being performed.
- Do not use the meter if it appears damaged or if the case is open.
- Replace the battery as soon as the low battery indicator appears to ensure accurate readings.
- Adhere to local and national safety codes.
3. Package Contents
Upon opening your UNI-T UT161 series multimeter package, please verify that all items listed below are present and in good condition:
- UNI-T UT161 Series Digital Multimeter (UT161B, UT161D, or UT161E model)
- Gold-plated test leads
- USB cable (for data communication)
- Temperature probe (included with UT161D model only)
- Multi-purpose socket (included with UT161E model only)
- English User Manual
- Gift box and cloth bag
Note: 4x 1.5V AAA batteries (R03) are required and NOT included in the package.
Image: Contents of the UNI-T UT161 series multimeter package, including the meter, test leads, USB cable, and manual.
4. Product Overview
Familiarize yourself with the components and controls of your multimeter:
Image: Detailed diagram of the multimeter's front panel with labeled components.
Panel Components:
- NCV Sensing Position: For non-contact voltage detection.
- Indicator Light: Provides visual feedback for various functions, including NCV.
- LCD Display: High-definition display for clear readings.
- Manual/Auto Range Button (RANGE): Toggles between manual and automatic ranging.
- Hz % / USB Button: Selects frequency/duty cycle measurement or activates USB communication.
- REL Button: Activates relative measurement mode.
- MAX MIN Button: Toggles between maximum, minimum, and peak hold readings.
- HOLD Button: Freezes the current display reading and activates/deactivates backlight.
- SELECT Button: Used to select different functions within a rotary switch position.
- Function Range Knob Switch: Rotary switch to select the desired measurement function (e.g., V~, V=, A~, A=, Ω, Capacitance, Diode/Continuity, NCV, OFF).
- Measurement Input Ports:
- 10A MAX: Input for high current measurements (up to 10A, fused).
- mA μA: Input for low current measurements (up to 600mA, fused).
- COM: Common (negative) input terminal for all measurements.
- V Ω: Input for voltage, resistance, capacitance, frequency, duty cycle, diode, and continuity measurements.
Physical Features:
- Premium Dial: Ensures precise positioning and durability.
- Test Lead Jack: Fine workmanship for smooth and stable connections.
- Retractable Stent: Allows the multimeter to be placed diagonally on a table for hands-free operation.
Image: Close-up views of the multimeter's LCD, rotary dial, input jacks, and retractable kickstand.
5. Initial Setup
Battery Installation
The UT161 series multimeters require four 1.5V AAA (R03) batteries. These are not included in the package.
- Ensure the multimeter is turned OFF and disconnect all test leads from the input terminals.
- Locate the battery compartment cover on the back of the meter.
- Use a screwdriver to loosen the screw(s) securing the battery cover.
- Remove the battery cover.
- Insert four 1.5V AAA batteries, observing the correct polarity (+ and -) as indicated inside the compartment.
- Replace the battery cover and tighten the screw(s) securely.
The meter is now ready for use.
6. Operating Modes
To perform a measurement, rotate the function range knob switch to the desired function. Use the 'SELECT' button to toggle between different sub-functions if available (e.g., AC/DC voltage, diode/continuity).
General Measurement Steps:
- Insert the black test lead into the 'COM' jack.
- Insert the red test lead into the appropriate input jack for your measurement (e.g., 'V Ω' for voltage/resistance, 'mA μA' for low current, '10A MAX' for high current).
- Select the desired function using the rotary switch.
- Connect the test leads to the circuit or component under test.
- Read the measurement value on the LCD display.
Specific Measurement Functions:
- AC/DC Voltage Measurement (V~ / V=): Connect leads to the circuit in parallel. The meter can measure up to 1000V.
- AC/DC Current Measurement (A~ / A=, mA μA): Connect leads in series with the circuit. Ensure the correct input jack is used based on the expected current.
- Resistance Measurement (Ω): Connect leads across the component. Ensure the circuit is de-energized.
- Capacitance Measurement (F): Connect leads across the capacitor. Ensure the capacitor is discharged before measurement.
- Frequency (Hz) / Duty Cycle (%): Connect leads to the signal source.
- Diode Test / Continuity Test: Use for checking diodes and circuit continuity. An audible beep indicates continuity.
- NCV (Non-Contact Voltage): Select NCV mode and bring the top of the meter near a live conductor to detect AC voltage without direct contact.
- Temperature Measurement (UT161D only): Connect the temperature probe to the meter and place the probe tip on the object to be measured.
Image: A UNI-T UT161E multimeter being used to measure current in an industrial electrical panel.
Image: A UNI-T UT161B multimeter displaying an AC voltage reading.
7. Specifications
| Specifications | Range | UT161B | UT161D | UT161E |
|---|---|---|---|---|
| AC voltage (V) | 1000V | ±(1%＋3) | ±(1%＋3) | ±(0.8%＋10) |
| DC voltage (V) | 1000V | ±(0.5%＋3) | ±(0.5%＋3) | ±(0.05%＋5) |
| AC current (A) | 10A | ±(1.2%＋5) | ||
| 20A | ±(1.2%＋5) | ±(0.8%＋10) | ||
| DC current (A) | 10A | ±(1%＋2) | ||
| 20A | ±(1%＋2) | ±(0.5%＋10) | ||
| Resistance (Ω) | 60MΩ | ±(1%＋2) | ±(1%＋2) | |
| 220MΩ | ±(0.5%＋10) | |||
| Capacitance (F) | 60mF | ±(3%＋5) | ±(3%＋5) | |
| 220mF | ±(3%＋5) | |||
| Frequency (Hz) | 10MHz | ±(0.1%＋4) | ±(0.1%＋4) | |
| 220MHz | ±(0.01%＋5) | |||
| Duty cycle (%) | 0.1%~99.9% | ±(2%＋5) | ±(2%＋5) | ±(2%＋5) |
| Temperature (℃/℉) | -40℃~1000℃ | ±(1%＋3) | ||
| -40℉~1832℉ | ±(1%＋6) | |||
| Display count | 6000 | 6000 | 22000 | |
| Bandwidth (Hz) | 40Hz~500Hz | 40Hz~1kHz | 40~10kHz | |
| LPF ACV | √ | |||
| LoZ ACV | √ | |||
| ACV+DCV | √ | |||
| Transistor hFE | √ | |||
| Peak Hold | √ | √ | ||
| Analog bar | 31 | 31 | 46 | |
| General Characteristics | ||||
| Power | 1.5V battery (R03) x 4 (No include) | |||
| Product net weight | 350g | |||
| Product size | 190mm x 90mm x 50mm | |||
| Standard accessories | Gold plated test leads, USB cable, temperature probe (161D), multi-purpose socket (161E), English manual | |||
| Standard individual packing | Gift box, cloth bag | |||
Table: Detailed technical specifications for the UT161B, UT161D, and UT161E models.
Image: Side view of the multimeter with kickstand, showing dimensions (186cm x 8.9cm x 4.9cm).
8. Maintenance
Cleaning:
- Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
- Keep the terminals clean to avoid inaccurate readings.
Battery Replacement:
When the low battery indicator appears on the display, replace the batteries promptly to ensure continued accurate operation. Refer to the 'Battery Installation' section for detailed steps.
Storage:
- If the meter is not to be used for a long period, remove the batteries to prevent leakage and damage.
- Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.
9. Troubleshooting
If your multimeter is not functioning as expected, check the following common issues:
- No display or faint display: Check battery installation and charge level. Replace batteries if necessary.
- Incorrect readings: Ensure test leads are properly connected, the correct function is selected, and the circuit is within the meter's measurement range. Clean input terminals.
- No continuity beep: Ensure the continuity function is selected and test leads are making good contact.
- Fuse blown (for current measurements): If current measurements are consistently zero or incorrect, the fuse might be blown. Refer to a qualified technician for fuse replacement.
10. User Tips
- Sound Ring Interruption: Some users have noted that the sound for continuity testing might briefly interrupt if test leads are shorted and held for 3-5 seconds. This is generally normal behavior and not indicative of a fault.
- Fuse Rating vs. Max Current: For the UT161E, while the maximum current is rated at 20A, the fuse might be rated at 11A. This is a common design choice where the fuse protects against sustained overcurrents, while the meter can handle higher transient peaks or specific measurement durations up to its maximum rating. Always respect the fuse rating for continuous current.
11. Warranty and Support
The UNI-T UT161 series multimeters typically come with a 1-year warranty. For warranty claims, technical support, or service, please contact your original point of purchase or the official UNI-T service center in your region. Keep your purchase receipt as proof of purchase.
