Measuring power factor of a single phase motor on a three-phase service
Connecting a single-phase load to two phases of a three-phase service is the same as connecting the load to a single phase service. Your meter should be set to single-phase and there should be no connection to the third phase. If the motor has a capacitor that remains connected while it is running, the power factor could be close to 1. A universal motor could also have a high power factor.