Category Archives: Testing Methods

Explore all insulation testing methods including resistance testing, polarization index, hi-pot, step voltage, and more. Learn when and how to use each one.

Dielectric Absorption Ratio (DAR) Explained: The 60-Second Insulation Diagnostic

You don’t always have 10 minutes for a full polarization index test. Sometimes you need a quick answer: is this insulation healthy or not? That’s where the dielectric absorption ratio comes in. The DAR gives you a meaningful diagnostic in just 60 seconds. It’s not as thorough as the PI, but it’s far more useful than a simple… Read More: Dielectric Absorption Ratio (DAR) Explained: The 60-Second Insulation Diagnostic »

Polarization Index Test: What It Is, How to Do It, and What the Results Mean

The polarization index test is the most reliable way to assess insulation condition on motors, generators, and other rotating machinery. It goes deeper than a standard 60-second megger reading and gives you a result that’s independent of temperature and equipment size. If you only have time for one insulation test on a critical motor, make it the PI… Read More: Polarization Index Test: What It Is, How to Do It,… »

Insulation Resistance Testing: The Complete Guide

Every wire, motor, transformer, and cable in your facility is wrapped in insulation. That insulation is the only thing standing between normal operation and a ground fault, a fire, or a serious injury. Insulation resistance testing tells you if that barrier is still doing its job. It’s simple, non-destructive, and takes minutes. Yet it’s one of the most… Read More: Insulation Resistance Testing: The Complete Guide »