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Power Tools & Small Appliances
This test would also apply to
other similar equipment that
has a line cord. For double
insulated power tools, the
megohmmeter lead shown
(See graphic on page 8)
connected to the housing
would be connected to
some metal part of the tool
(ie: chuck, blade). Note:The
switch of the device must
be in the “ON” position and
the main power should be
disconnected.
Motors
AC-Disconnect the motor from the line by disconnecting the wires at the
motor terminals or by opening the main switch. If the main switch is used
and the motor also has a starter then the starter must be held, by some
means, in the “ON” position. In the latter case, the measured resistance
will include the resistance of the motor, wire and all other components be
-
tween the motor and the main switch. If a weakness is in dicated, the mo
-
tor and other components should be checked individually. If the motor is
disconnected at the motor terminals, connect one megohmmeter lead to
the grounded motor housing and the other lead to One of the motor leads.
DC-Disconnect the motor from the line. To test the brush rigging,field
coils and armature connect one megohmmeter lead to the grounded
motor housing and the other lead to the brush on the commutator. If the
resistance measurement indicates a weakness,raise the brushes off the
commutator and separately test the armature, field coils and brush rigging
by connecting one megohmmeter lead to each of them individually, leav
-
ing the other connected to the grounded motor housing. The above also
applies to DC Gemerators.
REED Instruments
1-877-849-2127 | [email protected] | www.reedinstruments.com