Typically there are two sets of windings on a single phase motor Start/Run. Any capacitor must be disconnected. First, measure the start winding. With the run winding engaged, take your next set of readings. These can be trended over time or compared to a known good motor of the exact same kind.
No. The AT31™ should never be used while plugged into the charger.
Failure of the battery to hold a charge cold indicate needed battery replacement or a problem with the charger power supply. Contact email@example.com for guidance.
No. The AT31™ uses a 9 pin db connector and only leads provided by ATP should be used.