Major tech MT25, Instruction Manual, Page: 9 / 16

5.9. DC Current Measurements
1. Set the rotary function switch to the 10A position.
2. Insert the black test lead into the COM input jack
and the red test lead into the 10A input jack.
3. Remove power from the circuit under test, then open
up the circuit at the point where you wish to measure
current.
4. Touch the test lead probes in series with the circuit
being measured.
5. Apply power to the circuit.
6. Read the current on the LCD display.
Observe all safety precautions when working on live circuits. Do
not measure current on circuits that exceed 250V. Measurements
in the 10A range should be limited to 30 seconds maximum every
15 minutes. max voltage 600V.
!
WARNING:
9
5.10. Resistance Measurements
1. Set the rotary function switch to the Ω position.
2. Press the MODE button until the “ Ω ” symbol appears
on the LCD display.
3. Insert the black test lead into the COM input jack
and the red test lead into the Ω input jack.
4. Touch the test lead probes to the component under
test. If the component is installed in a circuit, it is
best to disconnect one side before testing to
eliminate interference with other devices.
5. Read the resistance in on the LCD Display.
Never test resistance on a live circuit.
!
WARNING:
5.11. Diode Test
1. Set the rotary function switch to the Ω
position.
2. Press the MODE button until the “ ” symbol
appears on the LCD display.
3. Insert the black test lead into the COM input jack
and the red test lead into the Ω input jack.
4. Touch the test lead probes to the diode under test.
5. Forward voltage will indicate 0.4 to 0.7 on the
display. Reverse voltage will indicate “ ”. Shorted OL
devices will indicate near 0 and an open device wil l
indicate “
” in both polarities. OL
RED
PROBE
BLACK
PROBE
FORWARD TEST
RED
PROBE
BLACK
PROBE
REVERSE TEST
Never test diodes in a live circuit.
!
WARNING: