UNI-T UT501B Digital Insulation Resistance Tester 1000V PI DAR

UNI-T UT501B Digital Insulation Resistance Tester in Sri Lanka

1000V Megohmmeter with PI/DAR Measurement for Electrical Maintenance

The UNI-T UT501B Insulation Resistance Tester provides precise diagnostics for measuring insulation resistance, low resistance, and AC voltage across electrical equipment. It is designed to assist electrical maintenance engineers in Sri Lanka with testing transformers, motors, cables, switches, and general electrical appliances at selectable 250V, 500V, and 1000V test voltages.

Discover our complete selection of Insulation Resistance Testers – specifications, features, and megger testing tools in Sri Lanka!

Featuring Polarization Index (PI) and Dielectric Absorption Ratio (DAR) measurement, automatic voltage discharge, and a backlit LCD for low-light environments, this instrument streamlines insulation diagnostics and helps prevent unexpected electrical failures in industrial and commercial installations.

Technical Specifications

Insulation Resistance (250V/500V/1000V): 0MΩ~99.9MΩ, accuracy ±(3%+5) | 100MΩ~5GΩ, accuracy ±(5%+5)

Low Resistance (Continuity): 0.01Ω~200Ω | Accuracy: ±(2%+3) | Test current approx. 5.0V/>200mA

AC Voltage Measurement: 30V~600V | Accuracy: ±(2%+3)

Short-Circuit Current: <2mA

Overvoltage Category: CAT III 600V, Pollution Degree 2 (per IEC61010)

Key Features

Functions: PI (Polarization Index) and DAR (Dielectric Absorption Ratio) measurement with selectable time intervals (60s/15s and 60s/30s)

Test Voltage Selection: Rotary knob for 250V/500V/1000V insulation test voltage plus AC voltage and continuity modes

Safety: Automatic voltage discharge after test completion, high-voltage warning light, and audible buzzer alarm

Display: 2000-count backlit LCD for clear visibility in dark plant environments, with low-battery and overload indication

Power: 6 x 1.5V (LR6) batteries with low power consumption

Build: Compact, durable housing designed for mobile electrical technicians

Applications

Insulation resistance testing for transformers and generators

Preventive maintenance checks on electric motors and industrial machines

Cable and switchgear insulation diagnostics for electrical contractors

Routine safety testing of electrical appliances and switches

Package Includes

1 x UNI-T UT501B Insulation Resistance Tester main unit

Test leads with alligator clips

Elastic carrying strap

6 x 1.5V batteries (installed)

Carrying case

English user manual

Downloads

📄 Download UNI-T UT501B Data Sheet
📄 Download UNI-T UT501B User Manual