UNI-T UT201+ 400A True RMS AC Clamp Meter: The Ultimate Guide

Overview

The UNI-T UT201+ is a compact, auto-ranging true RMS AC clamp meter designed for professional electricians, maintenance technicians, and DIY enthusiasts who need reliable AC current measurement in a lightweight, easy-to-use tool . As part of UNI-T's respected UT200 series, this meter combines essential measurement functions with advanced safety features in an ergonomic design weighing just 248g .

Engineered to meet strict international safety standards (CAT II 600V / CAT III 300V) with full-featured anti-burn protection, the UT201+ ensures user safety in high-energy electrical environments . Its ability to measure AC current up to 400A makes it ideal for residential, commercial, and light industrial applications .

Key Features at a Glance

• AC Current Measurement: Measures AC current up to 400A with 40A and 400A ranges

• True RMS Technology: Provides accurate readings even with non-linear or distorted AC waveforms

• Wide Voltage Range: Measures both AC and DC voltage up to 600V

• Non-Contact Voltage (NCV) Detection: Audio/visual indication for safe live voltage detection without contact

• Comprehensive Testing: Includes Resistance (40MΩ), Capacitance (4nF), Frequency (10Hz-10kHz), Diode, and Continuity tests

• Fast Capacitance Measurement: Response time <3 seconds for ≤1mF capacitors

• Large LCD Display: 4099-count backlit display for easy reading in low-light conditions

• Compact Jaw Opening: 28mm jaw accommodates standard cables and conductors

• User-Friendly Features: Data hold, MAX/MIN recording, and auto power off

• Extended Battery Life: Low power consumption design delivers up to 400 hours of operation (sleep mode <11μA)

• Safety Certified: CAT II 600V / CAT III 300V, EN61010-1 compliant

Detailed Specifications

The UNI-T UT201+ delivers professional-grade accuracy across a range of essential electrical parameters.

Electrical Measurement Specifications

General Characteristics

Special Functions

Mechanical & Environmental Specifications

What's in the Box

Key Functions & Operation

1. AC Current Measurement

• Set the rotary switch to the 40A or 400A position

• Press the trigger to open the clamp jaws and clamp around one conductor only

• Read the current value on the display

• For best accuracy, center the conductor within the jaws

2. AC/DC Voltage Measurement

• Set the rotary switch to the V position

• Press SELECT to choose between AC and DC measurement

• Connect test leads in parallel to the circuit under test

• The 10MΩ input impedance ensures minimal circuit loading

3. NCV (Non-Contact Voltage) Detection

• Set the rotary switch to the NCV position

• Bring the NCV sensing end of the clamp jaws near a live conductor or outlet

• As electric field intensity increases:

  • Red LED flashes faster

  • Buzzer beeps with increasing frequency

  • More "-" segments appear on the LCD

4. Resistance & Continuity Testing

• Set the rotary switch to the Ω/continuity/diode position

• Press SELECT to cycle through resistance, continuity, and diode test modes

• For continuity, the buzzer sounds when resistance is low

5. Capacitance Measurement (UT202+/UT202A+ only)

*Note: UT201+ has limited capacitance function (4nF only)*

• Fully discharge capacitors before testing to avoid damage

• Connect test leads in parallel with the capacitor

6. Frequency Measurement

• Long press SELECT (about 2 seconds) to enter/exit Hz measurement function

• Connect test leads to the signal source

• Measure frequencies up to 10kHz (voltage) or 50Hz-100Hz (current)

7. MAX/MIN Recording

• Press MAX/MIN button to enter maximum/minimum measurement mode

• The meter records and displays the highest and lowest readings during the measurement period

• Long press to exit

8. Data Hold & Backlight

• Short press HOLD to freeze the current reading on the display

• Long press HOLD (about 2 seconds) to turn the LCD backlight on/off (auto-off after 60s)

9. Auto Power Off

• Meter automatically shuts down after 15 minutes of inactivity to save battery

• To disable: Press and hold SELECT while turning the meter on from OFF position

UT201+ vs UT202+ vs UT202A+: Key Differences

Safety Features

The UT201+ incorporates multiple safety features to protect users:

• CAT II 600V / CAT III 300V Rating: Suitable for measurements on distribution circuits and permanently installed equipment

• Full-Featured Anti-Burn Protection: Withstands energy surges up to 600V (30kVA)

• Over-Voltage and Over-Current Alarms: Audible and visual warnings when limits are exceeded

• Input Warning: Never input voltage exceeding 600V between terminals and ground

• Low Battery Detection: Automatic detection with shutdown sequence to maintain accuracy

• Double Insulation: Complies with international double insulation requirements

• 1-Meter Drop Protection: Withstands accidental falls from workbenches

Applications

The UNI-T UT201+ is an ideal tool for:

⚡ Residential Electrical Work

• Measuring current on household circuits and appliances

• Checking outlet voltages

• Identifying live wires with NCV function

• Troubleshooting lighting circuits

🏭 Light Industrial Maintenance

• Troubleshooting control panels and machinery

• Measuring motor running currents

• Verifying fuse and circuit breaker loads

🔧 HVAC & Refrigeration

• Measuring compressor and fan motor currents

• Troubleshooting control boards

• Verifying capacitor values (basic)

🏠 DIY & Home Workshop

• Testing batteries and power supplies

• Checking circuit continuity

• General electrical troubleshooting

🎓 Educational & Vocational Training

• Ideal for electronics students

• Teaching fundamental measurement techniques

• Safe introduction to electrical measurements

Why Choose the UNI-T UT201+?

The UT201+ stands out as a reliable entry-level AC clamp meter that delivers professional-grade performance at an affordable price point .

Key Differentiators:

Customer Reviews Summary

Users consistently praise the UT201+ for:

• Build Quality: Solid construction with comfortable grip and protective features

• Ease of Use: Intuitive interface and auto-ranging functionality

• Value for Money: Excellent features at an affordable price point

• Accuracy: Reliable readings for everyday electrical work

• NCV Function: Convenient non-contact voltage detection adds safety

Final Verdict

The UNI-T UT201+ represents an excellent entry point into professional-grade AC current measurement. While it lacks the DC current capability of the UT203+ or the temperature measurement of the UT202+, it delivers reliable true RMS AC current measurement up to 400A with essential features like NCV detection, voltage measurement, and continuity testing .

Whether you're a homeowner needing to troubleshoot household circuits, a maintenance technician performing basic electrical checks, or a student learning electrical fundamentals, this meter delivers professional-grade performance without breaking the bank .

With its true RMS accuracy, NCV detection, 400-hour battery life, and CAT III 600V safety rating, the UT201+ is a reliable, affordable, and feature-rich AC clamp meter that will serve you well for years to come .

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