UNI-T UT620A Digital Micro Ohm Meter

UNI-T UT620A Digital Micro Ohm Meter

The UNI‑T UT620A is a precision digital micro‑ohm meter designed for accurate low‑resistance measurements in constrained environments. It employs a true four‑wire (Kelvin) measurement method to eliminate lead and contact resistance errors, delivering high‑resolution readings down to 10 µΩ. A large LCD display with backlight ensures legibility in dimly lit areas, while a built‑in lithium‑ion battery provides hours of untethered operation.

Key features include a high/low limit comparison function that alerts users when measured values fall outside preset thresholds, enabling rapid go/no‑go testing. The meter can also calculate unknown wire lengths in feet or meters, making it ideal for verifying cable runs. Data hold, relative (zero) mode, and automatic power‑off enhance usability and conserve battery life. Up to 1,000 measurement results can be stored internally, and bidirectional USB connectivity allows seamless two‑way data transfer between the meter and a PC for trend analysis.

With a measurement range spanning from 10 µΩ up to 6 kΩ across multiple current levels (10 mA to 5 A), the UT620A balances wide dynamic range with up to ±(0.25 % + 25) basic accuracy in its lower ranges. This combination makes it suitable for applications such as:

• Transformer and motor winding resistance checks, ensuring coil integrity and detecting shorted turns.
• Welding joint inspections, verifying contact quality in critical assemblies.
• Busbar and cable connectivity tests in power distribution cabinets.
• Metal coating resistance measurements, confirming plating uniformity.
• Automotive and PCB trace resistance verification in repair and manufacturing settings.

Rugged yet compact (370 × 90 × 290 mm), the UT620A comes with Kelvin clips, test leads, USB cable, power adapter, software CD, and an English user manual. Its thoughtful design, extensive feature set, and robust data management capabilities make it an essential tool for electricians, maintenance engineers, and quality‑control technicians requiring fast, reliable low‑resistance diagnostics.

Features:

• Four‑Wire (Kelvin) Measurement: Eliminates lead/contact resistance for precise low‑Ω readings.
• High/Low Limit Alarm: Comparison function with upper and lower thresholds for quick go/no‑go tests.
• Wire‑Length Calculation: Converts resistance into length (m/ft) to verify cable runs.
• Built‑in Lithium‑Ion Battery: 7.4 V / 4000 mAh for hours of portable use.
• 1 000‑Group Data Storage: Internal logging for later recall and analysis.
• USB PC Connectivity: Bidirectional data transfer (HID‑compliant) for real‑time monitoring and trend analysis.
• Data Hold & Relative (Zero) Mode: Freeze the display and zero‑out test leads for differential measurements.
• LCD Backlight: Ensures readability in dim environments.
• Auto Power‑Off & Low‑Battery Indicator: Conserves power and warns when recharging is needed.

Specifications:

General Characteristics:

Applications:

• Power Transformer Testing.
• Electric Motor Maintenance.
• Welding Inspection.
• Busbar & Switchgear Testing.
• Electrical Cable Quality Control.
• Metal Conductor & Coating Verification.
• Aerospace, Rail & Automotive.
• Battery Pack Assembly.

Package Include:

• 1x UT620A Digital Micro Ohm Meter (main unit)
• 1x Kelvin test leads (red and black)
• 1x Power cord
• 1x Power adapter
• 1x USB communication cable
• 1x PC software CD
• 1x Carrying bag
• 1x English user manual
• 1x Gift box (individual packaging)

UNI-T UT620A Documents:

• Datasheet
• User Manual