Phone Order
0466 909 653
Email Order
Fax Order
07 3041 3232
Order Online
www.olct.co
indicating that the charging process is complete.
Note:
The charge stored in the insulation will be discharged automatically when the test button is released.
Be careful not to turn the range switch knob while the test button is pressed, or the instrument will be damaged.
b). Measurements at 2000M
Ω
/1000V
Some specifications require testing at 1000V. This voltage must also be selected where the supply voltage of
the installation is between 500V and 1000V. First, set the range switch to 1000V and then proceed as indicated
in an above 500V test. The above note also applies to testing at 1000V. In addition the following applies.
Note:
Make sure that the circuit under test does not include components which will be damaged by the applied
1000V. Many normal components of an installation are
likely to be damaged if tested at 1000V. Examples are
power factor correction capacitors, low voltage mineral insulated cables, electronic light dimmers, electronic
ballasts and starters for fluorescent lamps etc…
c). Lock power on Feature
For hands free operation a lock power on feature is incorporated on the press to test button. Set the LOCK
button to lock test voltage. Pressing it again will switch the LOCK function off.
5. LOW RESISTANCE (CONTINUITY) MEASUREMENTS
a). Set the range switch to the 200
Ω
position.
b). Connect the red test lead to the
V
Ω
terminal and black to the COM terminal.
c). Connect the tips of the test leads to both ends of the circuit under test. Read resistance in
Ω
on the LCD.
d). When the resistance on the circuit is below approximately 40
Ω
, it will be indicated by a continuous beep.
6. 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”.
b) Connect test prods of test leads IN PARALLEL to the circuit being measured.
c) Read the voltage value on LCD.
7. 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 - 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.