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it states at 4.2.7 that bearings for AC VFD driving drives should be evaluated for AC impedance. I understand the electrical model of insulated bearing to be capacitor in parallel with resistor. So testing a bearing with DC insulation resistance test will not tell the whole story if it passes. The bearing could still pass AC current at higher common mode voltage frequencies produced by the drive correct? Can anyone recommend/advise if there is a test set on the market that can be used to get the impedance/frequency plot of the bearing
