An insulator should have a very high resistance to current, but exposure to temperature fluctuations, electrical and mechanical stress and weathering can cause the development of microscopic cracks, and these crevices can cause contaminants to seep through the insulator. When this happens, the reliability of insulators decreases which may cause problems such as power loss, short circuits, accidental electrocution of personnel and electrical system failure.
To test cable insulation quick and easy, an insulation resistance tester is used, and the Megger MIT525 5-kV is one insulation resistance tester that can conduct various tests on insulators found in cables, transformers and motors.
Lightweight, compact and portable makes the MIT525 ideal for field testing. The MIT525 also features a double case design for extra user protection, and is rated CATIV 600 volts on all terminals and an Ingress Protection 65.
The Megger MIT525 5-kV Insulation Resistance Tester can conduct automatic Step Voltage, Ramp and Dielectric Discharge tests. It also features a real time clock and PC connectivity through USB and RS232 ports. The PC connectivity allows advanced results analysis using the PowerDB Lite software.
• Analog and Digital display
• Operation through batteries or through AC mains
• Variable voltage from 50 Volts to 1 kiloVolts at 10 Volts increments
• Variable voltage from 1 kiloVolts to 5 kiloVolts at 25 volts increments
• Measurement of voltage, capacitance, time constant and leakage current
• Automatic Insulation Resistance, Polarization Index, Ramp, Step Voltage, Dielectric Discharge and Dielectric Absorption Ratio testing
• Built-in timer control and display
• 3 milliampere test current
• Measurement of resistance from 10 kΩ to 10 TΩ
• USB and RS232 ports
• Real time clock
• Alarm limit mode
• 3 milliampere noise rejection
• 2 percent error guarding 500 kΩ leakage with a 100 MΩ