Elma DT5500
side 23
AC/DC Voltage measurements
a). Set the range switch to ACV or DCV position
b). Connect red test lead to “V
Ω
” terminal and black test lead to terminal “COM”.
c). Connect test prods of test leads IN PARALLEL to the circuit being measured.
d). Read the voltage value on LCD.
Power tools and 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 connected to the housing would be
connected to some metal part lf the tool(e..g 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 between the motor and the main switch. If a weakness is in dicated, the motor
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, leaving the other connected to the grounded motor housing. The
above also applies to DC Generators.
