Testing armature for grounds.
(5) Check for a grounded armature with 220-volt ac or dc line
Touch one test prod
source is not available, use 110-volt source.
to armature core and simultaneously touch other prod to one commuta-
If lamp lights, armature is grounded; replace grounded
Test all commutator bars in this manner.
Exercise care when using a 220-
bodily injury may
result under certain conditions.
Do not use voltage in excess of
220 volts for any of these tests.
(6) Place armature assembly on growler, and hold thin strip
of steel, such as a hacksaw blade, approximately l/16-inch away from
Rotate armature slowly in growler. If
steel strip vibrates, winding is short circuited; replace shorted