Velleman DVM205AM Mode D'emploi page 6

c) Resistance / Diode / Continuity / Capacitance Measurements
CAUTION: To avoid electric shock, make sure all power of the circuit to be measured is off and all capacitors are
fully discharged when measuring resistance or capacitance.
1. Plug the black test lead in COM and the red test lead in the + connector (#11).
2. Set the selection switch (#8) to the
3. Press the MODE button to select ,
4. Connect the test leads to the component or circuit to be measured and read the measured value from the LCD.
5. When testing continuity, a beeping sound shall be heard if the resistance is <30 .
6. When measuring the forward voltage across a diode, a normal diode will indicate 0.4V or 0.7V. The reverse
voltage will indicate "OL" (same as in open condition). A short-circuited diode will have a 0mV reading.
d) Frequency or Duty Cycle Measurements
1. Plug the black test lead in COM and the red test lead in the + connector (#11).
2. Set the selection switch (#8) to the Hz/%duty position.
3. Press the Hz/% button to select "Hz" or "%".
4. Connect the test leads to the circuit under test and read the frequency or the duty cycle on the display.
e) Temperature Measurements
1. Insert the type K thermocouple in the appropriate sockets: negative plug in COM, positive plug in +.
2. Set the selection switch (#2) to °C/°F.
3. Press the °C/°F button to select °C or °F.
4. Touch the target surface with the extremity of the probe and read the measured temperature from the LCD.
f) Period Measurements
1. Plug the black test lead in COM and the red test lead in the + connector (#11).
2. Set the selection switch (#2) to "Period ms".
3. Connect the black test lead to ground and the red test lead to the wire that connects to the component to be measured.
4. Read the measured value on the display.
NOTE: The applied time for most fuel injectors is displayed on the negative (-) slope.
g) Pulse Width Measurements
1. Plug the black test lead in COM and the red test lead in the + connector (#11).
2. Set the selection switch (#2) to "Pulse Width ms".
3. Connect the black test lead to ground and the red test lead to the wire that connects to the component to be measured.
4. Read the measured value on the display.
h) RPM Measurements
1. Plug the black test lead in COM and the red test lead in the + connector (#11).
2. Set the selection switch (#2) to the applicable position (2, 4, 5, 6 or 8CYL on the RPMx10 range).
3. Connect the black test lead to the negative pole of the car battery and connect the red test lead to a breaker point.
4. Crank the engine; the RPM (rotations per minute) will be displayed.
DVM205AM
CAP position.
or CAP.
- 6 - VELLEMAN