Insulation Testing: Megohmmeter or Hipot Tester
There are two common methods for performing insulation resistance testing on cables, wiring and electrical equipment. One uses a megohmmeter to measure insulation resistance. The other uses a hipot tester to check for insulation breakdown. Both apply a high voltage, either ac or dc, to the device under test (DUT) and measure the resulting current flow. A modern megohmmeter (or megohm meter) applies a dc voltage to a DUT and measures the dc current (nanoamps or microamps).
