A DC hipot tester produces a high potential (voltage) electrical current to test the insulation of an electrical component. Hipot tests are performed on components like transformers, electrical motors and printed circuit boards, devices which require insulation to be effective. A DC hipot conducts a dielectric voltage withstand test, testing the safety of a product or electrical component. The resistance of the insulation is then measured. Insulation may breakdown due to moisture, aging, vibration, wear, and a variety of other reasons. An advantage of renting a DC hipot tester is a higher accuracy current measurement, with nearly zero current leakage, while an AC hipot tester may give inaccurate leakage current readings due to the characteristics of the equipment under test, such as a capacitor.