The hand held armature testers (growlers) are light weight and easy to use.
They detect shorts and open circuits in a wide range of armatures. Faults are indicated by green and red LED’s in the handle and an acoustic indication.
They are made in two versions:
HHG1 which has a pole spread of 19mm.
HHG2 which has a pole spread of 9mm for smaller armatures
Both the above plug into a power pack:
HHG‐PP230 for a 230V single phase supply or HHG‐PP110 for a 110V single phase supply
Growlers will work on any armature where the coil can be isolated magnetically. Typically these are found in DC armatures, though some AC rotors, depending on how they are wound, may also be tested. In an AC motor, if there is a squirrel cage or other type of ring that prevents individual coils from being isolated magnetically, then this may interfere with a growler’s ability to function”