How do you choose appropriate RMO-T unit from the series for the application? In other words, how do customers interested in testing windings of power transformers choose a device from RMO-T series?
Different RMO-T series units produce different test current value. RMO10T generates test currents from 5mA to 10A true DC and with a resistance measurement range from 1µΩ to 2000Ω, while for example RMO50T generates test currents from 5mA to 50A also true DC and with the same resistance measurement range as RMO10T. Using 50A alows you to achieve more accurate results testing windings of power transformers which have inherently low resistance. Transformer can reach saturation faster when the current is higher. The inductance value of a transformer depends on the current injected in the windings. When the transformer is saturated the inductance is minimized. A transformer is normally designed to reach saturation when the current is 1,2 times the peak value of the no-load current. The no-load current is normally in the range of 0,2 to 5 percent of the nominal winding current.When measuring DC resistance the test current should be at least 1,2 times the no-load current of the transformer.
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