Specifications

85
Growler test for grounded coil : The armature to be tested is placed on the growler and then
the growler is switched
‘
ON
’
. Place one lead of an AC milli-voltmeter on the to commutator bar
the other meter lead on the shaft, as shown in Fig. 6.18.
Fig. 6.18
If a reading is noticed on the meter, turn the armature so that the armature so that the next
commutator bar is in same position as the earlier one, and test as before. Continue in this
manner until all the bars are tested. Where the meter gives no deflection, it is an indication that
the grounded coil is connected to this particular bar.
Growler test for shorted coil : The procedure to test for short circuits in an armature as
follows.
The armature to be tested is placed on the growler and then the growler is switched on. A
thin piece of metal, such as a hacksaw blade, is held over to the slot of the armature as shown
in Fig. 6.19.
Fig. 6.19