The UNI-T UT501A is a professional digital insulation tester (Megger) for measuring insulation resistance in electrical equipment, circuits, and appliances. With test voltages of 100–1000 V, it measures up to 5 GΩ and also supports AC voltage, low resistance, PI, and DAR tests for reliable maintenance and troubleshooting.

Key Features:

Selectable Test Voltages: 100 V / 250 V / 500 V / 1000 V
Insulation Resistance Range: 0 MΩ – 5 GΩ
High Accuracy: ±(3 % + 5 digits) to ±(5 % + 5 digits)
AC Voltage Measurement: 30 V – 750 V (±2 % + 3 digits)
Low Resistance Measurement: 0.01 Ω – 200 Ω (±2 % + 3)
Polarization Index (PI) and Dielectric Absorption Ratio (DAR) tests
Auto Range & Auto Discharge for user safety
2000-Count Backlit LCD Display for clear readings
Overload and High-Voltage Indication with red warning light + buzzer
Auto Power-Off and Low-Battery Indicator to save power
Lightweight & Durable Design for field and lab use
Certifications: CE and UKCA approved

Parameter	Range / Details
Test Voltages	100 / 250 / 500 / 1000
Insulation Resistance	0 MΩ – 5 GΩ
Short-Circuit Current	< 2 mA
Low Resistance	0.01 Ω – 200 Ω
AC Voltage	30 V – 750 V
Display Count	2000
Power Supply	6 × 1.5 V (LR6) batteries
Dimensions	150 mm × 100 mm × 71 mm
Weight	Approx. 500 g
LCD Size	70.6 mm × 34 mm
Color	Red & Grey

Included Accessories: Test Probes, Alligator Clips, Test Leads, Carrying Gallus.

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