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Megger MIT500 Series 5kV Megohmmeters

Model: MIT500

Analog/Digital 5 kV Megger; 500, 1000, 2500, 5000 V; 10 Tohms; Cat IV 600V

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Analog/Digital 10 kV Megger; 500, 1000, 2500, 5000, 10,000 V; 20 Tohms; Cat IV 600V

$5,400.00 USD

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Analog/Digital 5 kV Megger; 500, 1000, 2500, 5000 V; 10 Tohms; Cat IV 600V

$3,400.00 USD

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Analog/Digital 5 kV Megger; 500, 1000, 2500, 5000 V; 10 Tohms; Cat IV 600V

$4,455.00 USD

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Megger's 5-kV and 10-kV Insulation Resistance Testers

The new range of insulation resistance testers consists of three models: two 5 kV units (MIT515 and MIT525) and a 10 kV unit (MIT1025). Resistance measurement is available up to 10 TΩ for the 5 kV models and 20 TΩ for the 10 kV model. The new instruments are smaller and lighter than previous models yet offer advanced features and rapid charge capability.

A key productivity feature is the ability to take measurements when connected to line power/mains with a dead battery. Intelligent battery charging ensures the optimum charge rate as a function of battery level, resulting in minimum charge times.

The rugged, unique dual case design provides the ultimate protection for a portable instrument and a clip-on lead pouch ensures that leads remain with the instrument at all times. The case lid is removable for improved terminal access. IP rating is IP65 with the case closed preventing water/dust ingress. High reliability and safety are built in; all models are safety rated to CATIV 600 V and are double insulated.

Five preset voltage ranges are provided in insulation test mode, plus a user settable lock voltage range. Any selectable test voltage may be locked and restored via the selector switch, thereby increasing efficiency of commissioning and repetitive tests. Preconfigured diagnostic tests include Polarization Index (PI), Dielectric Absorption Ratio (DAR), dielectric discharge (DD), Step Voltage (SV) and ramp test.

The ramp function gradually increases voltage up to a selected level while graphing current vs. voltage (graph downloadable). Graphs can be compared to example curves in IEEE 95-2002 to reveal a variety of faults difficult to detect otherwise. Small defects can be easily detected without risking the sudden large voltage increments produced by a Step Voltage test. Monitoring the developing graph during test enables the operator to terminate prior to breakdown, thereby reducing the possibility of damage to already flawed insulation. These units are particularly informative on polyester, asphalt and epoxy-mica insulations. They can also test voltage suppression devices.

Simplicity of operation is achieved with two rotary switches and the large backlit display enables multiple results to be displayed simultaneously.

Advanced memory storage includes time/date stamping of results, logging of data and recall of results to screen. A fully isolated USB device interface (type B) is used for safe transfer of data to Megger's PowerDB asset management software.


The units are designed for testing the insulation of high-voltage electric equipment. Their wide voltage range also allows applications for low-voltage equipment. Generators, motors, transformers, cables and switchgear all require effective maintenance. The test techniques on the instruments provide valuable diagnostic information.
They are ideal for:

  • Electrical contractors
  • Testing and service companies
  • Wind farm and solar generation operators
  • Power generation and distribution companies
  • Industrial companies
  • Rail companies

All three instruments test the insulation resistance of:

  • High-voltage power cables and high-voltage buses
  • Large motor/generator windings
  • Line and substation transformers

The MIT525 and MIT1025 also perform spot tests, stepvoltage tests, dielectric discharge tests, ramp tests, and dielectric absorption tests for the following applications:

  • Acceptance testing at installation to check conformance to specifications.
  • Routine preventive/predictive maintenance testing after installation.
  • QA testing as part of the manufacturing process
  • Diagnostic testing to isolate faulty components for repair.

With its higher voltage testing capability, the MIT1025 is the perfect everyday work tool for manufacturers, users and maintainers of rotating machinery. Designed in accordance with the requirements of IEEE43:2000, the MIT1025 is ideal for measuring the insulation resistance of armature and field windings in rotating machines rated 1hp (750 W) or greater. The standard applies to synchronous, induction and dc machines as well as synchronous condensers.

What's Included

  • USB cable (MIT525, MIT1025 only)
  • PowerDB Lite software
  • 3 m leadset x 3, medium insulated clips
  • 3 m leadset x 3, large insulated clips (MIT1025 only)
  • Power lead

Key Features

  • Smaller size and lighter weight allows easier transport and use without compromising performance.
  • High measurement range enables installation testing and long-term trending of higher value apparatus.
  • Unique dual case design allows for fire-retardant protection while maintaining ruggedness.
  • High-quality, flexible silicon test leads meet safety regulations of IEC 61010-31:2008 while ensuring measurement accuracy.
  • Timed IR plus PI, DAR, DD, SV and ramp tests maximize diagnostic testing capability.
  • Operate from line power when battery fully discharged (charges while operating).
  • Two and one-half hour full battery charge time (one-half hour charge for one hour testing) significantly increases productivity.
  • Up to six hours continuous testing (5 kV) on a single battery charge.
  • Industry best guard terminal performance to insure highest accuracy of measured values.
  • Enhanced driver technology provides plug-and-play when connected to the internet. No tedious and potentially interruptive setup procedures.
  • Dedicated voltmeter function (30 V to 660 V) with frequency measurement allows the user to check for induced voltages.
  • CATIV 600 V safety rating on all terminals allows for safe use in the widest range of applications.
  • Large LCD with automatic backlight.
  • Noise filter rejects up to 3 mA noise for effective operation in electrically noisy environments.
  • High altitude operation up to 3000 m while maintaining CATIV 600 V rating.
  • Rotary switch operation for easy, intuitive field use.
  • Field replaceable battery.
  • Locking test leads provide additional safety.
  • 3 mA short circuit current with unique max power regulations technology ensures maximum transfer whatever the load until selected voltage is reached.
  • 5% accuracy all the way up to 1 T-ohm at 5 kV and 2 T-ohm at 10 kV ensures highest accuracy where it matters most.
  • Date and time-stamped test results reduce the risk of error in result interpretation.
MIT515 MIT525 MIT1025
Display Analog/Digital
Power Supply Line power
Test Voltage 10.0 kV
5.0 kV
2.5 kV
1.0 kV
500 V
250 V
10 V steps 50 V to 1 kV
25 V steps 1 kV to max. test voltage
10 V steps 100 V to 2.5 kV,
25 V steps 2.5 kV to max. test voltage
Measurements Max. reading 10 TΩ 10 TΩ 20 TΩ
Min. reading 10 kΩ 10 kΩ 10 kΩ
Capacitance and time constant
Leakage current
Test Types Auto IR
Auto PI
Auto SV
Auto DD
Auto DAR
Ramp test
Other Features CAT IV 600 V safety rating
Timer control
Timer display
3mA test currents
USB output (cable included)
RS232 output (cable included)
Calibration certificate included
IP65 rating
Alarm limit mode
Compatible with PowerDB
User programmable lock voltage range
Temp. recording (manual entry)
Real time clock
Battery charge time (hours) 2.5 2.5 2.5
Noise rejection 3mA 3mA 3mA
Guard terminal performance 2% error guarding 500 kΩ leakage with a 100 MΩ load


  MIT515 MIT525 MIT1025
Measurements Max. reading 10 TΩ 10 TO 20 TΩ
Min. reading 10 TΩ 10 TΩ 10 TΩ
Other Features Battery charge time (hours) 2.5 2.5 2.5
Noise rejection 3mA 3mA 3mA
Noise rejection 2% error guarding 500 kΩ leakage with a 100 MΩ load

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