An important distinction between RCL meters and MCA™ meters is the ability to fully exercise the entire winding insulation system. Using resistance alone, the I2R loss can be determined across a circuit, but the system electrical reliability, developing winding faults or efficiency cannot be determined. Inductance, which is variable, depending on the winding design and rotor to winding position* also can’t be used for these purposes.
Unfortunately, systems using inductance as a base will often fail good electric motors and windings. In order to obtain the true condition of a motor winding, one must view all of the motor circuit components, including resistance, impedance, inductance, phase angle current frequency response (I/F) and insulation resistance, DF & Capacitance to ground.