Insulation testing

5kV d.c. diagnostic Insulation Resistance Tester (with memory)

Model: MIT525

Producer: Megger

country of origin: United Kingdom

5 kV IRT with all test modes including a ramp test plus advanced memory functions with recall to screen, RTC for time/date stamp of results and USB cable interface to PC / PowerDB

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Key features
Measures up to 10 TΩ
PI, DAR, DD, SV and ramp test
Improved productivity – operate from line power/mains if battery dead
Li ion battery - extended capacity, rapid charge
Advanced memory with time/date stamp
CATIV 600 V safety rating


Offering CAT IV, the MIT525 is compact, light 5 kV insulation resistance tester for the diagnostic testing and maintenance of high voltage electrical equipment. It is both smaller and lighter than its predecessor, making it even easier to carry and store.

As well as measuring insulation resistance to 10 TΩ, the MIT525 also offers various diagnostic tests such as polarisation index, dielectric absorption ratio, step voltage, dielectric discharge and ramp testing.

Now equipped with lithium ion fast rechargeable batteries, the instrument has a large, clear, easy-to-read display, making it equally suitable for use in both bright sunlight and poorly lit environments. Information displayed includes resistance, voltage, leakage current, capacitance, battery status and time constant. In addition, the elapsed time of the test is displayed constantly removing the need for separate timer.

a.c. voltage (auto-rangin)
90-264 V rms, 47- 63 Hz 100 VA
Battery charge time
2.5 hours deep discharge,
2 hours normal discharge
11.1 V, 5.2Ah Li-ion batteries,
meet IEC 62133:2003
Battery life
6 hours (typical) continuous testing at 5 kV with a 100 MΩ load
Test voltage
250 V, 500 V, 1000 V, 2500 V, 5000 V, User defined test voltage.
Used fedinded test voltage
50 V to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps
Test voltage accuracy
+4%, -0%, ±10 V nominal test voltage at 1 GΩ load (0°C to 30°C)
Resistance range
10 kΩ to 15 TΩ @ 5 kV
5000 V
2500 V
1000 V
500 V
250 V
±5% from 1 MΩ to
1 TΩ
500 GΩ
200 GΩ
100 GΩ
50 GΩ
±20% from 1 MΩ to
10 TΩ
5 TΩ
2 TΩ
1 TΩ
500 GΩ

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