September 2012Maintenance, Test & Measurement, Calibration
Megger’s new high voltage insulation resistance testers (IRTs) offer exceptional versatility in a compact, rugged and light unit. They are capable of providing accurate measurements up to 10 TΩ for 5 kV versions and 20 TΩ for 10 kV versions and have facilities for insulation resistance (IR), timed insulation resistance (IR(t)), polarisation index (PI), dielectric absorption ratio (DAR), dielectric discharge (DD), step voltage (SV) and ramp tests.
The new instruments also provide enhanced productivity – they can be used from an AC source even when their internal rechargeable battery is fully discharged – and they are capable of delivering dependable results even in noisy electrical environments such as electricity substations with noise levels up to 3 mA.
They are available in three versions. The MIT515 5 kV is an entry-level 5 kV test set which offers IR, IR(t) and test modes. The MIT 525 5 kW, which is also a 5 kV unit, adds facilities for DD, SV and ramp diagnostic testing, as well as a large-capacity internal memory for storing time and date stamped test results, which can subsequently be recalled to the display or downloaded to a PC via the instrument’s electrically isolated USB interface. Real-time output of results during tests is also supported. The MIT 1025 10 kV insulation resistance tester offers the same facilities as the MIT525, but is a 10 kV unit.
The MIT515 and MIT525 testers allow tests to be carried out at five pre-defined voltages from 250 V to 5 kV, while the MIT1025 provides pre-defined test voltages from 500 V to 10 kV. All models allow an additional user-defined lock voltage to be set. This is a specific voltage range which facilitates repetitive measurements while guarding against excessive test voltages being applied to sensitive equipment.
Equally suitable for mains or battery operation, Megger’s new IRTs incorporate a user-replaceable, rechargeable Li-ion battery, which is automatically recharged when the instrument is connected to a mains supply. Discharged batteries take less than 2,5 hours to fully recharge and provide up to 6 hours of testing at 5 kV and up to 4,5 hours at 10 kV.
Other key features common to all of Megger’s new high-voltage IRTs include a large liquid crystal display with automatic backlight, a dedicated voltmeter function covering the range 30 V to 660 V, and a CAT IV 600 V safety rating in line with IEC 61010. The instruments are supplied as standard with test leads and clips and a user guide on CD-ROM. In addition a USB cable is provided for the MIT525 and MIT1025, together with a copy of the Megger PowerDB lite software package, which is a convenient and versatile tool for storing, analysing and reporting test results.
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