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Megger MIT525 5kV High Voltage Insulation Resistance Tester

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The upgraded version of Megger's MIT515 HV insulation resistance tester, the MIT525 includes additional functionality not found on the basic unit.

This insulation tester is made for use with a wide variety of electrical equipment and is an essential for detecting insulation breakdown before it becomes a serious issue. It can be used with cables, transformers, circuit breakers and motors/generators, ensuring everything is in good working order.

Testing with the MIT525 is simple; use the rotary dials on the front of the tester to select the tester and/or test voltage you want, connect up and press the test button. The instrument can test insulation resistance to 10TΩ with selectable test voltages of 250, 500, 1000, 2500 and 5000V (plus a voltage lock function). It can also be used to test polarisation index (PI) and dielectric absorption ratio (DAR) automatically.

The Megger MIT525 is designed with portability in mind; the unit is lightweight and small in size for easy transportation. It's also protected against damage thanks to its unique, dual casing which can completely cover the unit when in transit.

What's Different Compared to the MIT515?

The main difference between this unit and the MIT515 is the inclusion of fully downloadable internal memory. The tester can store a large amount of results directly in its built-in memory, then this data can be easily transferred across to PC and interacted with using Megger's PowerDB Lite asset management software (included as standard with the tester). All results are date and time stamped and can be recalled directly on screen using the tester if needed.

Megger's MIT525 also comes with additional testing functions: step voltage, dielectric discharge and ramp testing.

Megger MIT525 5kV Insulation Resistance Tester Key Features

  • Maximum insulation resistance range of 10TΩ
  • Selectable test voltages to 5000V (5kV)
  • Robust protective casing
  • Timed IR plus PI and DIR diagnostic testing
  • Step voltage, dielectric discharge and ramp testing functions
  • Can operate even when the battery is dead when on line power/mains
  • Rapid charge battery gives up to 6 hours of testing
  • Built-in 30V-660V voltmeter function
  • CAT IV 600V safety rating
  • LCD display is backlit and large enough to clearly see testing results
  • Noise filter enhances accuracy by rejecting noise up to 3mA
  • Dielectric discharge, step voltage and ramp testing functions
  • Built in memory time stamps test data and lets users recall information when they need it
  • Real time clock
  • USB interface

What's Included?

  • Megger MIT525 5kV Insulation Resistance Tester
  • User Guide CD
  • Power Lead
  • 3 x 3m Leadset with Medium Insulated Clips
  • USB Cable
  • PowerDB Lite Software
Accessories related to this product:
Part Code1001-939

Megger MIT525 Technical Specifications

Electrical Specifications  
Voltage Input Range 85-265 V rms, 50/60 Hz, 60 VA
Battery 11.1 V, 5.2 A hour, meets IEC
Battery Life Typical capacity 6 hours continuous
at 5 kV with a 100 MΩ load
Battery Charge Time 2.5 hours from deep discharge,
2 hours normal discharge
30 Min. Quick Charge 1 hour operation at 5 kV, 100 MΩ
Test Voltages 250 V, 500 V, 1000 V, 2500 V,
5000 V
User Defined Test Voltage 100 V to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps,
Accuracy (23 °C): ±5% to 1 TΩ, ±20% to 10 TΩ
Guard 2% error guarding 500 kΩ leakage
with 100 MΩ load
Display Range Analogue 100 kΩ to 10 TΩ
Display Range Digital 10 kΩ to 10 TΩ
Short Circuit Current 3 mA nominal, max. power on all
loads outperforming many 5 mA
Insulation Alarm 10 kΩ to 1 TΩ
Capacitor Charge <3 s/μF at 3 mA to 5 kV
Capacitance Range (above 500V) 10 nF to 25 μF (dependant on
 measurement voltage)
Capacitance Accuracy ±10% ±5 nF
Voltage Output Accuracy (0 to 30°C) +4%, -0%, ±10 V nominal test voltage
at 1 GΩ
Current Measurement Range 0.01 nA to 6 mA
Current Measurement Accuracy (23°C) ±5% ±0.2 nA at all voltages
Interference (Noise) Rejection 1 mA per 250 V up to a maximum of 3mA
Voltmeter Range 30 V to 660 V ac or dc, 50/60 Hz
Voltmeter Accuracy ±3%, ±3 V
Timer Range Up to 99 minutes, 15 second
minimum setting
Memory Capacity 5½ hours continuous logging every 5 s.
or 33 logged PI tests
or 350 logged IR tests
Test Regimes IR, IR(t), DAR, PI, SV, DD, ramp test
Interface USB type B (device)
Real Time Output USB, 1 reading/second (voltage,
current and resistance)
Environmental Conditions  
Altitude 3000 m, CAT rating maintained
>2000 m*
* Test leads connected
Operating Temperature -20 °C to 50 °C
Storage Temperature -25 °C to 65 °C
Humidity 90% RH non-condensing at 40 °C
Ingress Protection IP65 (lid closed), IP40 (lid open)
General Specifications  
Safety Meets the requirements of
IEC 61010-1, CATIV 600 V
EMC Meets the requirements of
Dimensions L 315 mm x W 285 mm x H 181 mm
Weight 4.5 kg
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