The UNI-T UT501A insulation resistance meter is a versatile device designed to accurately measure the insulation resistance of electrical equipment and households. It can measure insulation between electrical circuits or between a circuit and ground. The UT501A allows you to measure insulation resistance, AC voltage, low resistance, as well as PI (polarization index) and DAR (dielectric absorption coefficient). Equipped with a 2000-digit LCD display, backlight function, overload indicator and automatic shutdown, the UT501A ensures safety, accuracy and comfort during operation. In addition, the CE and UKCA certificates confirm the high quality of the device and its compliance with European standards.
The UT501A tester not only provides standard measurements, but also offers a continuous low-value resistance measurement mode, an automatic discharge function, and a continuous measurement mode supported by beeps and a red warning light. The PI and DAR functions and the automatic resistance calculation allow a detailed assessment of the insulation condition of high-voltage equipment such as transformers, generators, motors, capacitors or cables. In addition, the low resistance reset function increases the accuracy of measurements, making the UT501A an invaluable tool in the diagnosis and maintenance of electrical equipment.
The compact and robust housing of the UT501A ensures that the device withstands heavy use in the field and on industrial sites. The backlit LCD display allows you to read results even in harsh lighting conditions, and the automatic power-off function extends battery life. With continuous measurement capability and an intuitive warning system, you gain full control over the inspection process, allowing you to quickly and safely assess the condition of your equipment. The UNI-T UT501A is an indispensable partner wherever reliability and accuracy matter.

- Model UT501A
- The number of displayed digits is 2,000
- DAR measurement Supported (60 s / 15 s and 60 s / 30 s)
- PI measurement Supported
- Automatic range selection / low battery indicator Supported
- LCD backlight / alarm light built-in
- Sound signal / high voltage signal Built-in
- Overload / automatic discharge indicator Built-in
- Secondary test voltage display Built-in
- Internal resistance test 10 MΩ Supported
- Corresponding standards IEC 61557 (61557-1:2007; 61557-2:2007; 61557-4:2007 only UT502A)
- Power supply 6 × 1.5 V batteries (LR6)
- Display 70.6 × 34 mm
- Product color Red, gray
- Weight 500 g
- Dimensions 150 × 100 × 71 mm

- Measuring ranges
- Test voltages 100 V / 250 V / 500 V / 1000 V; 250 V / 500 V / 1000 V; 500 V / 1000 V / 2500 V
- Measurement of insulation resistance (Ω) 100 V: 0 MΩ ~ 100 MΩ (accuracy ±(3%+5)); 250V: 0 MΩ ~ 99.9 MΩ (±(3%+5)), 100 MΩ ~ 5 GΩ (±(5%+5)); 500 V: 0 MΩ ~ 99.9 MΩ (±(3%+5)), 100 MΩ ~ 5 GΩ (±(5%+5)); 1000 V: 0 MΩ ~ 99.9 MΩ (±(3%+5)), 100 MΩ ~ 5 GΩ (±(5%+5)); 2500V: 0MΩ ~ 99.9MΩ, 100MΩ ~ 9.9GΩ, 10GΩ ~ 20GΩ.
- Load current 50 V (50 kΩ) 1 mA (0% ~ 10%); 100 V (100 kΩ) 1 mA (0% ~ 10%); 250 V (250 kΩ) 1 mA (0% ~ 10%); 500 V (500 kΩ) 1 mA (0% ~ 10%); 1000V (1MΩ) 1mA (0% ~ 10%); 2500 V (1 MΩ) 1 mA (0% ~ 10%).
- Short circuit current