Description

UNI-T UT521 Digital Earth Resistance Tester

The UNI-T UT521 Earth Resistance Tester is a reliable handheld meter designed for measuring earth resistance and earth voltage in electrical grounding systems. It uses a microcontroller-based design to provide accurate and dependable measurements for professional electrical testing and maintenance.

With support for both three-wire earth resistance testing and simple two-wire measurement, the UT521 is suitable for checking grounding systems used in electrical installations, power systems, communication equipment, lightning protection systems, industrial facilities, and construction applications.

Key Features

• Earth Resistance Testing: Measures grounding resistance across 20Ω, 200Ω, and 2000Ω ranges.
• Earth Voltage Measurement: Measures AC earth voltage up to 200V.
• 2-Wire & 3-Wire Testing: Supports accurate three-wire measurement as well as simpler two-wire testing.
• Clear LCD Display: Features a large backlit LCD for easy viewing in different lighting conditions.
• Data Hold: Holds the current measurement on the display for convenient recording.
• Data Logging: Stores up to 20 measurement results for later reference.
• Auto Power-Off: Automatically switches off after approximately 10 minutes of inactivity to conserve battery power.
• Over-Range Indication: Displays “OL” when the measured value exceeds the selected range.
• Battery Check: Provides a convenient way to monitor battery condition.
• Double Insulation: Designed with reinforced insulation protection for safer operation.
• Portable Design: Compact handheld construction with a durable ABS housing and carrying bag.

Applications

The UNI-T UT521 can be used for testing grounding and earth systems in:

• Electrical power systems
• Electrical installations and equipment
• Lightning and anti-thunder protection systems
• Industrial facilities
• Communication systems
• Manufacturing plants
• Chemical industries
• Construction sites
• Oil and fossil fuel facilities
• Other grounding and electrical maintenance applications

Specifications

Package Includes

• 1 × UNI-T UT521 Earth Resistance Tester
• 3 × Standard Test Leads
  • Green – 5 m
  • Yellow – 10 m
  • Red – 20 m
• 1 × Plug Test Lead with Alligator Clip
• 2 × Auxiliary Earth Stakes
• 1 × Carrying Bag
• 1 × English User Manual