UT139C True RMS Digital Multimeters 600V

UT139C True RMS Digital Multimeters 600V integrates high security, high accuracy, strong anti-interference capabilities, and full-featured measurement functions, emphasizing industrial-grade reliability and consumer-grade cost-effectiveness.

As the core model of the UT139 series, it is specifically designed for electrical maintenance, motor troubleshooting, HVAC commissioning, electrical repair, and electronic R&D scenarios. It is suitable for complex circuit environments including power frequency, frequency conversion, and harmonic interference, making it the preferred tool for professional electrical and electronic engineers.

Product Description from the Supplier

Xi'an Mingxi Taida Information Technology Co., Ltd. brings over 12 years of industry expertise to deliver cutting-edge measurement and control solutions.With progressed computerization forms and strict quality control, we guarantee each item meets the most noteworthy guidelines for proficient applications.

Description

The UT139 series is UNI-T's flagship handheld multimeter series developed to meet the needs of industrial sites with strong interference, high safety, and multi-parameter measurement. Its original purpose was to solve the industry pain points of traditional multimeters, such as "insufficient accuracy, poor anti-interference, low safety level, and single function".

Features of the UT139C True RMS Digital Multimeters 600V

• True RMS Measurement: Accurately captures nonlinear and distorted waveform signals, avoiding the errors of ordinary multimeter average measurements, and is suitable for complex load scenarios such as frequency converters and switching power supplies.

• VFC Frequency Filtering Technology: Built-in low-pass filter suppresses high-frequency interference, stabilizes frequency converter voltage/current measurement results, and solves the pain point of "noise jumps" in industrial environments.

• CAT III 600V Safety Rating: Double insulation design, full-range 600V input protection, equipped with HRC high-breaking capacity fuses, burnout and overload protection, compliant with CE/UKCA/cETLus certifications.

• Automatic/Manual Range Dual Modes: One-button switching, automatic range for fast measurement adaptation, manual range for locked accuracy, balancing efficiency and accuracy.

• NCV Non-Contact Voltage Detection: Detects AC electric fields without contact, providing audible and visual alarms to indicate live areas, avoiding the risk of electric shock. Suitable for wiring inspection and power outage confirmation scenarios.

• Full-Function Measurement + Expansion Interfaces: Covers voltage, current, resistance, capacitance, temperature, frequency, continuity, and diode measurements. Supports external clamp head for high-current measurements.

​​​​​​​• User-Friendly Operation Design: Features a large 5999-count screen, white LED backlight, data hold, MAX/MIN extreme values, REL relative values, and automatic shutdown, making measurements more convenient in low-light environments and for extended periods.

​​​​​​​• Rugged and Durable Structure: Dual-color insulating protective sleeve, adjustable stand, 2-meter drop protection, suitable for harsh working conditions such as construction sites and workshops.

Targeting professional electricians, electrical repair personnel, HVAC engineers, electronic R&D personnel, and industrial equipment maintenance teams, this product emphasizes "safety, accuracy, durability, and versatility," serving as a replacement for expensive imported multimeters while balancing budget and performance.

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The UT139 series Digital Multimeters includes four models: UT139A, UT139B, UT139C, and UT139S. UT139C is the high-end, general-purpose model:

​​​​​​​• UT139A: Basic model, 2000 counts, focusing on basic voltage and current measurement

​​​​​​​• UT139B: Advanced model, 4000 counts, adding temperature and on/off functions

​​​​​​​• UT139C: All-round model, 5999 counts, true RMS + VFC + NCV + full functionality, suitable for professional scenarios

​​​​​​​• UT139S: Dark-light model, black EBTN screen, enhanced visibility in bright/dark environments.

Specifications of the UT139C True RMS Digital Multimeters 600V

Key Features-UT139C True RMS Digital Multimeters

​​​​​​​• True RMS Measurement: Adapts to non-sinusoidal signals

​​​​​​​• VFC Frequency Conversion Filtering: Suppresses high-frequency interference and stabilizes readings

​​​​​​​• NCV Non-Contact Voltage Detection: Detects AC electric fields with audible and visual alarms

​​​​​​​• MAX/MIN Extreme Value Recording: Captures signal peak/valley values

​​​​​​​• REL Relative Value Measurement: Eliminates lead resistance and accurately measures minute differences

​​​​​​​• Data Hold: Locks measurement results for easy recording

​​​​​​​• LED Backlight: Provides clear readings in low-light environments

​​​​​​​• Automatic Power Off: Automatically shuts off after 15 minutes of inactivity, extending battery life

​​​​​​​• External Clamping Head Interface: Supports AC/DC 40A current sensors, expanding high-current measurement capabilities

Product technical specifications

DC Voltage ​​​​​​​(DCV)

​​​​​​​• Range: 60mV/600mV/6V/60V/600V

​​​​​​​• Accuracy: ±(0.5%+2)

​​​​​​​• Input Impedance: ≥10MΩ

ACV

​​​​​​​• Measurement range: 60mV/600mV/6V/60V/600V

​​​​​​​• Accuracy: ±(0.8%+3) (45Hz~400Hz)

​​​​​​​• Input impedance: ≥10MΩ

​​​​​​​• Frequency response: 45Hz~10kHz

DCA

​​​​​​​• Measurement range: 600μA/6000μA/60mA/600mA/6A/10A

​​​​​​​• Accuracy: ±(0.8%+2)

​​​​​​​• Maximum input: 10A (continuous)

ACA

​​​​​​​• Measurement range: 600μA/6000μA/60mA/600mA/6A/10A

​​​​​​​• Accuracy: ±(1.0%+3) (45Hz~400Hz)

​​​​​​​• Frequency response: 45Hz~1kHz

Resistance

​​​​​​​• Measuring range: 600Ω/6kΩ/60kΩ/600kΩ/6MΩ/60MΩ

​​​​​​​• Accuracy: ±(0.8%+2)

​​​​​​​• Open circuit voltage: Approximately 2.8V

Capacitance

​​​​​​​• Measuring range:9.999nF/99.99nF/999.9nF/9.999μF/99.99μF/999.9μF/9.999mF/99.99mF

​​​​​​​• Accuracy:±(4.0%+5)

Temperature (Type K thermocouple)​​​​​​​

​​​​​​​• Range: -40℃~1000℃/-40℉~1832℉

​​​​​​​• Accuracy: ±(1.0%+3) (-20℃~250℃)

​​​​​​​​​​​​​​• Resolution: 0.1℃/0.1℉

Frequency (Hz)

​​​​​​​​​​​​​​• Range: 10Hz~10MHz

​​​​​​​​​​​​​​• Accuracy: ±(0.1%+4)

​​​​​​​​​​​​​​• Sensitivity: ≥50mV (RMS)

Continuity/Disconnection / Diode

​​​​​​​​​​​​​​• Continuity/Disconnection: ≤50Ω, buzzer alarm

​​​​​​​​​​​​​​• Diode: Forward current approximately 1mA, reverse withstand voltage 600V

Software User Manual

The UT139C True RMS Digital Multimeters 600V is a pure hardware measuring instrument with no built-in software or app, but it supports external expansion and data logging adaptation:

​​​​​​​​​​​​​​• It can be used with a UNI-T data acquisition module (optional) to achieve real-time transmission of measurement data to a PC

​​​​​​​​​​​​​​• It supports third-party multimeter data logging software and is compatible with RS232/USB adapters (optional)

​​​​​​​​​​​​​​• No driver installation is required; it is plug-and-play (expansion modules require corresponding drivers)

Extended Operation Guide (Software Side)

​​​​​​​​​​​​​​• Data Acquisition: After connecting the extension module, open the PC data acquisition software, select the UT139C model, set the sampling frequency (1~10Hz), and record voltage, current, temperature, and other data in real time

​​​​​​​​​​​​​​• Data Export: Supports exporting to CSV/Excel formats for easy data analysis and report generation

​​​​​​​​​​​​​​• Alarm Settings: Upper and lower measurement limits can be set; automatic pop-up/audible alarm when exceeding the threshold

​​​​​​​​​​​​​​• Firmware Upgrade: Download the firmware from the UNI-T website, connect to the PC, and upgrade with one click (extension module only)

Custom Design

We get it that standard arrangements do not continuously meet one of a kind prerequisites. Our experienced building group gives comprehensive OEM/ODM customization administrations. Whether you require adjusted recurrence ranges, specialized activating alternatives, or custom frame components, we work closely with you to create the idealize arrangement. Our adaptable plan approach guarantees your particular application needs are completely tended to whereas keeping up our quality standards.

Why Select MXTD

Proven Encounter: Over 12 a long time of specialized skill in estimation and control frameworks development.

Expert Designing: Our gifted R&D group ceaselessly innovates to convey cutting-edge arrangements that keep you ahead of industry demands.

Quality Confirmation: Strict fabricating forms and comprehensive testing conventions guarantee dependable, steady performance.

Comprehensive Back: From starting meeting through progressing support, our committed group gives responsive specialized assistance.

Secure Conveyance: Collaborating with trusted coordinations suppliers guarantees secure, followed, and safety net provider shipment of your equipment.

Customer Center: We prioritize your victory with standard follow-ups, fast issue determination, and personalized benefit approaches.

Notes

✅It is forbidden to input voltage higher than 600Vrms,despiteof the possibility of measuring higher voltage,as it may damagethe instrument.

✅It is required to avoid the electric shock in measuring highvoltage.

✅Prior to measuring online circuit on-off,it is necessary to switchoff all power supplies in the circuits to be measured andrelease all residual charges to ensure the measurementaccuracy.

✅To prevent personal injury,it is not allowed to input the voltagehigher than DC 60V or AC 30V.

✅The point type K(Ni-Cr and Ni-Si)thermocouple is only applicablefor the measurement of temperature under 230℃/446°F.

Contact Us

If you are looking for an affordable excellent choice. As the UT139C True RMS Digital Multimeters product line, the UT139C True RMS Digital Multimeters 600V​​​​​​​ is highly competitive in the digital multimeter market.It doesn't make you pay for features you don't need, yet it fully meets your requirements in terms of key measurement capabilities.

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