The Megger MIT30 is a portable 30-kV insulation tester thathas been developed to satisfy the demand for a variety of high voltage, high accuracy, low current applications. The MIT30 is used to undertake HV insulation tests (proof/ hi-pot test) on insulating material where low levels of leakage current, down to an accuracy of 100 nA, need to be measured. The MIT30 has a test current of up to 330 μA, and userselectable trip levels from 0 to 360 μA, provide protection to the test piece against flashovers (arcing) and further damage in the event of a breakdown. An audible ionization indicator gives an audio indication of any electrical discharges present during the test period. The MIT30 can be used to perform step-voltage and proof tests which, when incorporated into a routine maintenance program, can aid in predicting potential failure before breakdown occurs.