You have heard the phrase, “Use the right tool for the job.” We propose a similar phrase, “Use the right range for the reading.” It is not unusual to see a large three-phase induction motor with phase resistance perfectly or closely balanced in the mili-ohm to micro-ohm range with an imbalance calculating well below 0.1%. With this kind of manufacturing precision, the balance of resistance measurement can be a very sensitive indicator of a changing…
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