Connection diagram:

The test points out the machine behaviour in the effective working conditions and a mechanic load is therefore necessary to be applied to the motor under test.
The mechanic load is made up, in the specific case, of the electromagnetic (Pasqualini) brake allowing a gradual regulation of the braking effect, through the direct current regulation flowing in its electromagnets.
The reference quantity is the couple and therefore the mechancal power at the shaft, that generally is varied from 0 to 1.25 times the rated power.

The quantities to be measured are: Voltage Current Total electrical power P = Wa + Wb Couple Rotation speed (revolution number) Mechanical power

The quantities to be calculated are: Efficiency h Power factor cosØ

The characteristic diagrams are: