UT505B Advanced Insulation Resistance DMM

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UNI-T UT505B Handheld Insulation Resistance Tester

The UNI-T UT505B Handheld Insulation Resistance Tester represents the pinnacle of portable electrical testing technology, providing professionals with an unprecedented combination of precision, intelligence, and diagnostic depth. Engineered to meet the most demanding electrical testing requirements, the UT505B transforms complex measurement challenges into clear, actionable insights.

Technical Specifications

Parameter	Specification
Insulation Resistance Range	50V: 0.1MΩ~50MΩ (±3%+3), 50MΩ~1GΩ (±10%+3) 100V: 0.1MΩ~100MΩ (±3%+3), 100MΩ~1GΩ (±10%+3) 250V: 0.1MΩ~200MΩ (±1.5%+5), 200MΩ~1GΩ (±1.5%+5) 500V: 0.1MΩ~500MΩ (±1.5%+5), 500MΩ~1GΩ (±1.5%+5) 1000V: 0.1MΩ~2000MΩ (±1.5%+5), 2GΩ~9.9GΩ (±5%+3), 10GΩ~20GΩ (±7%+3)
Voltage Range	3.0V to 700V
Current Range	0.5mA to 24A
Power Range	1W to 12kW
Display	6000-count LCD
Power Source	6 × 1.5V batteries (LR6)
Dimensions	103mm × 225mm × 59mm
Weight	630g

UT505 Series Comparison

Feature	UT505A	UT505B
Insulation Resistance Accuracy	0%~10% variation	0%~20% variation
Auto Fuse Check	No	Yes
High Voltage Output Alarm	No	Yes
Data Storage	Standard	99-group data storage
Recommended Applications	Standard electrical testing and maintenance	Advanced diagnostics and critical infrastructure testing

Key Features

True RMS measurement technology
Insulation resistance testing from 50V to 1000V
Extended measurement accuracy (0%~20% variation)
Auto fuse check functionality
High voltage output alarm
99-group data storage
Analog bar graph display
DAR and PI tests with comprehensive timing measurements
Comparison measurement functionality
Auto power-off and range selection
LCD backlight for low-light environments
Low battery indication
6000-count display resolution
Comprehensive compliance with IEC 61557 standards

Professional Applications

Advanced Industrial Diagnostic Solutions

Manufacturing and industrial maintenance professionals leverage the UT505B to:

Conduct comprehensive electrical system health assessments
Implement predictive maintenance strategies
Detect early signs of insulation degradation
Perform detailed diagnostics on complex electrical systems
Ensure compliance with stringent safety and performance standards

Critical Infrastructure Protection

Utility and infrastructure managers rely on the UT505B for:

Transformer insulation integrity verification
High-voltage distribution system diagnostics
Cable and wire insulation assessment
Critical infrastructure reliability testing
Comprehensive electrical system documentation

Precision Engineering and Research

Research facilities and advanced engineering teams utilize the UT505B to:

Conduct detailed electrical material characterization
Perform comprehensive insulation system testing
Develop and validate electrical design prototypes
Analyze complex electrical system behaviors
Implement rigorous quality control protocols

Renewable Energy System Verification

Renewable energy technicians depend on the UT505B for:

Solar array electrical integrity testing
Wind turbine generator insulation assessment
Power conversion equipment diagnostics
Performance verification of critical energy infrastructure
Detailed maintenance documentation

Diagnostic Test Methods: DAR and PI

Dielectric Absorption Ratio (DAR) Test

The Dielectric Absorption Ratio (DAR) is a crucial diagnostic method for assessing insulation condition. By measuring the ratio of insulation resistance at two specific time intervals (typically 30 and 60 seconds), it provides rapid insights into insulation health.

Key Diagnostic Capabilities:

Quickly detect moisture contamination
Identify early signs of insulation degradation
Evaluate polarization characteristics of insulating materials
Provide fast assessment of electrical equipment reliability

Polarization Index (PI) Test

The Polarization Index (PI) offers a more comprehensive evaluation of insulation condition by comparing insulation resistance at 10 minutes to the resistance at 1 minute after applying a test voltage.

Critical Applications:

Comprehensive long-term insulation health assessment
Detecting gradual insulation deterioration
Identifying complex insulation defects
In-depth reliability analysis of electrical systems

PI Test Interpretation:

PI > 2: Indicates good insulation condition
PI 1-2: Suggests potential insulation issues
PI < 1: Indicates significant insulation degradation

Professional Workflow Enhancement

The UT505B is more than just a measurement tool—it's a comprehensive diagnostic system that:

Provides advanced safety features
Delivers precise, actionable electrical system insights
Supports sophisticated maintenance strategies
Enables detailed performance documentation
Facilitates proactive equipment management

Customer Testimonials

"The UT505B has revolutionized our approach to electrical maintenance. Its advanced features and precision have helped us prevent potential system failures before they occur."
- Carlos M., Industrial Reliability Engineer

"As a renewable energy specialist, I've found the UT505B to be an indispensable tool for comprehensive system diagnostics and performance verification."
- Sarah L., Wind Energy Systems Manager

Warranty and Support

UNI-T provides a comprehensive 1-year warranty on the UT505B, covering manufacturing defects and component failures under normal use conditions. Our dedicated technical support team offers expert guidance to help you maximize the value of your investment and ensure reliable electrical testing capabilities.

Feature	Specification
Model Number	UT505B
TRMS	true
Max IR V	1,000VDC
Max IR Resistance Ω	200GΩ
Low IR Resistance Ω	100Ω
Count	6,000
Warranty	1 year
Shipping Dimmensions (L x W x H)	x x
Shipping Weight