Following are problems that can be found.Ī common misunderstanding is that a surge test can always find a blowout in a random wound motor. Winding resistance measurements can find problems not found with other tests and measurements (other than impedance measurements), and is therefore very important. Why winding resistance is an important measurement to make The measurements can be in milli Ohms or micro Ohms from a few µΩ to 2kΩ. Models come with measurements done through a separate Kelvin clamp lead set, or through Kelvin clamps connected to the high voltage output leads used for DC hipot and surge tests. Consequently the measurement of DUT resistance is more accurate.Ī 4-wire resistance measurement uses a Kelvin bridge or Wheatstone bridge to eliminate the lead resistance in the measurement device.Įlectrom’s iTIG III series of motor testers and winding analyzers use highly accurate 4-wire winding resistance measurements. In other words, only the DUT resistance is measured, the resistance in the leads from the measurement device to the DUT is eliminated. Each pair has a drive lead and a sense lead, and the resistance is “sensed” or measured from one Kelvin clamp to the other. With a 4-wire measurement 4 leads come from the measurement device and are connected in pairs to the ends of the DUT using what is called Kelvin clamps. Our 4-wire resistance measurement uses Kelvin clamps for improved accuracy
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