Sealey TA320 - Manual (Page 20)

tested insulation voltage in V (DC) is indicated, the symbol “ ”
flashes and the buzzer will sound.
d)Releasing the “TEST” button or pushing down the “TEST” button in
the “LOCK “ status will exit from the “LOCK” status and shut-off the
testing voltage, simultaneously the resistance value indicated in the
primary display will be held, and the top right corner display will still
show the status of the insulation voltage for the item tested.
Turning the function switch to off or pressing the EXIT button
will exit from the testing procedure during the process.
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
indicated, 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