Velleman DVM9912 - Manual (Page 6)

DVM9912 VELLEMAN 6
1. Set the function switch to the V position (“mV” will appear on the display). The device will automatically
select DC.
2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into
the positive (V) jack.
3. Touch the test probe tips to the circuit under test. Be sure to observe the correct polarity (red lead to
positive, black lead to negative).
4. Read the voltage on the display. The display will indicate the proper decimal point and value. If the polarity
is reversed, the display will show (-) minus before the value.
AC VOLTAGE MEASUREMENTS
1. Set the function switch to the V position. Press MODE to select AC voltage.
2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into
the positive (V) jack.
3. Touch the test probe tips to the circuit under test.
4. Read the voltage in the display. The display will indicate the proper decimal point, value and symbol (AC,
V, etc.).
DC CURRENT MEASUREMENTS
1. Insert the black test lead banana plug into the negative (COM) jack.
2. For current measurements up to 4000µ A DC, set the function switch to the µ A position and insert the red
test lead banana plug into the (µ A) jack.
3. For current measurements up to 400mA DC, set the function switch to the mA range and insert the red test
lead banana plug into the (mA) jack.
4. For current measurements up to 10A DC, set the function switch to the A position and insert the red test
lead banana plug into the 10A jack.
5. Press the MODE button until “DC” appears in the display.
6. Remove the power from the circuit under test, then open up the circuit at the point where you wish to
measure current.
7. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive
side of the circuit.
8. Apply power to the circuit.
9. Read the current on the display. The display will indicate the proper decimal point, value and symbol.
WARNING: Risk of electrocution. The probe tips may not be long enough to contact the live parts inside
some 240V appliance outlets because the contacts are recessed deep in the outlets. As a
result, the reading may show 0V when the outlet actually carries voltage. Make sure the
probe tips are touching the metal contacts inside the outlet before assuming that there is no
voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. Large
voltage surges may occur that can damage the meter.
CAUTION: Do not carry out current measurements on the 10A scale for a period longer than 30
seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.