UNI-T UT513A Insulation Resistance Tester
The UNI-T UT513A Insulation Resistance Tester is a standalone, handheld instrument engineered for precise insulation testing in electrical systems. With a robust, ergonomic housing and a clear LCD display, it allows technicians to perform high-voltage insulation resistance measurements safely and efficiently. Operating from 100 V up to 5,000 V, the UT513A supports a wide resistance range (from as low as 0.1 MΩ to as high as 1,000 GΩ, depending on test voltage), enabling evaluation of insulation integrity in cables, motors, transformers, switchgear, and other critical equipment.
Its built-in measurement functions include polarization index (PI) and dielectric absorption ratio (DAR), offering insight into insulation condition over time. The tester’s auto-range feature simplifies operation by automatically selecting the optimal measurement range, while the over-range warning and high-voltage indication ensure user awareness under extreme conditions. Data storage allows up to 18 readings to be saved internally for later review, and a USB interface facilitates swift data transfer to a PC.
Powered by eight 1.5 V (LR14) batteries, the UT513A provides approximately 15 to 30 minutes of continuous operation per charge cycle, depending on test settings. Its compliance with IEC 61557-1 and IEC 61557-2 standards, along with CE and UKCA certification, ensures adherence to international safety requirements for insulation testers.
Features:
- Auto range / auto power off.
- Low battery indication.
- Comparison measurement mode.
- Polarization index (PI) testing.
- Dielectric absorption ratio (DAR) testing.
- LCD backlight for low-light environments.
- Over-range warning to alert when measurement exceeds capacity.
- High-voltage indication during testing.
- Data storage capacity: 18 readings.
- Analog bar graph display with 30 segments.
- Powered by eight 1.5 V (LR14) batteries.
Specifications:
| Parameter | UT513A |
|---|---|
| Insulation Resistance Ranges: | • 100 V test: 0.1 MΩ – 500 MΩ (±(3% + 5)) • 250 V test: 0.5 MΩ – 2 GΩ (±(3% + 5)) • 500 V test: 0.5 MΩ – 20 GΩ (±(3% + 5)) • 1 kV test: 1 MΩ – 40 GΩ (±(2% + 3)) • 2.5 kV test: 2.5 MΩ – 100 GΩ (±(2% + 3)) • 5 kV test: 5 MΩ – 1,000 GΩ (±(2% + 5)) |
| Test Voltages (Selectable): | 100 V, 250 V, 500 V, 1 kV, 2.5 kV, 5 kV |
| Test Voltage Accuracy: | ±(3% + 5) for 100 V, 250 V, 500 V, 1 kV; ±(2% + 3) for 2.5 kV; ±(2% + 5) for 5 kV |
| Short-Circuit Current: | < 2 mA (for ≤ 1 kV tests); < 1.8 mA (for 2.5 kV); < 3 mA (for 5 kV) |
| DC Voltage Measurement: | 0 – 1,000 V (±(3% + 5)) |
| AC Voltage Measurement: | 0 – 750 V (±(3% + 5)) |
| Low Resistance Range (Ω): | 0.1 Ω – 999.9 Ω (±(1% + 3)) |
| Timing Measurement: | Yes (supports timed tests for PI/DAR) |
| Polarization Index (PI): | Automated calculation (ratio of 10 min to 1 min insulation resistance) |
| Dielectric Absorption Ratio (DAR): | Automated calculation (ratio of 1 min to 30 s insulation resistance) |
| Display: | Backlit LCD with 30-segment analog bar graph and digital readout |
| Data Storage: | 18 measurement records |
| Interface: | USB (for data transfer to PC) |
| Safety Standards: | IEC 61557-1, IEC 61557-2; CAT III 600 V |
| Certifications: | CE, UKCA |
| Power Supply: | 8 × 1.5 V (LR14) batteries (approx. 15 – 30 minutes continuous operation) |
| Dimensions: | 202 × 155 × 94 mm |
| Weight (net): | 1.89 kg |
Applications:
- Electric motors and generators.
- Power transformers and switchgear.
- Cables and wiring in industrial installations.
- Capacitors, coils, and circuit breakers.
- Residential, commercial, and industrial electrical maintenance programs.
Package Contents:
- 2x One-plug test leads to alligator clips (black & green)
- 1x Two-plug test lead to alligator clip (red)
- 8x Batteries (1.5 V LR14)
- 1x USB cable
- 1x Power adaptor
- 1x English manual
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