Learn how to test a transformer: insulation resistance, TTR, winding resistance, polarity, continuity, and dielectric checks.

So you have an old tube-type transmitter as a backup. It ran perfectly when you last turned it on two years ago to substitute for your then-ailing solid-state main transmitter. Now you need it again.

Utility power meters often must rely on a current transformer for polyphase applications. Current transformers have drawbacks: They are relatively expensive, require additional copper wiring, and can ...