Understanding resistance readings


What’s the most important thing on a test instrument’s display? The number, of course. This “rule” applies pretty generally across the range of electrical test instruments, with a few, but not many, exceptions. One bit of information commonly displayed is the unit of measurement. Just what is the number actually measuring; feet, inches, amperes, or what? In the case of insulation testing, we find a unique set of values, the high resistance units of kilohms, megohms, gigohms and tera-ohms. The first two are well established; the second pair are relatively new. In this cheat sheet, we've evaluated them all.

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