Major tech MT550 Manuale di istruzioni - Pagina 9

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7. LOW RESISTANCE (CONTINUITY) MEASUREMENTS

1. Set the range switch to 200Ω

2. Connect the red test lead to the V Ω terminal and black to the COM

terminal.

3. Connect the tips of the test leads to both ends of the circuit under

test read resistance in Ω on the LCD.

4. When the impedance on circuit is below approximately 40Ω. It will

indicate by a continuous beeper.

1. Set the range switch to ACV or DCV position

2. Connect red test lead to "V Ω" terminal and black test lead to terminal

"COM".

3. Connect test prods of test leads IN PARALLEL to the circuit being

measured.

4. Read the voltage value on LCD.

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.

Position