Velleman AVM460 User Manual - page 3
AVM460 GB
3
BEFORE USE
Open the back of the unit and place one AA size battery into the battery holder. Ensure
that the polarity corresponds to that shown.
Note: for the best readings, keep the meter flat on a non-metallic surface. Select the
range such that the pointer lies in the upper 1/3 of the meter scale.
If the pointer does not rest exactly over "0" to the left of the scale, turn the plastic screw
in the lower centre of the meter face to bring the needle to "0".
Ensure that the test leads are the right way around when measuring DC voltage and
current.
DC VOLTAGE MEASUREMENT
1. Set the selector switch to one of the DCV positions: it is better to start with a high
voltage range and then switch down.
2. Position the ends of the test probes on the circuit under test: ensure they are the
right way around.
3. Read the voltage on the black DC scales.
Be extremely careful when measuring voltages above 50V.
AC VOLTAGE MEASUREMENT
1. Set the selector switch to one of the ACV positions: it is better to start with a high
current range and then switch down.
2. Position the ends of the test probes on the circuit under test.
3. Read the voltage on the AC/DC scale. (for the 10V range, read from the red 10
VAC scale)
Be extremely careful when measuring voltages above 50V.
RESISTANCE MEASUREMENT
Before making any resistance measurements, disconnect the power from the circuit or
unit under test, and discharge all capacitors. If possible, it is best to remove batteries
and unplug any mains leads.
1. Set the selector switch to one of the Ω positions. Short the two probes together and
adjust the 0 OHM ADJ knob to set the pointer to the "0" at the right of the
resistance scale. If it won’t go, replace the battery with a new one.
2. Connect the ends of the probe across the circuit or part under test.
3. Read the resistance from the OHMS scale (GREEN): use the appropriate multiplier
to get the correct value (Rx1, x10 or x 1000, depending on the resistance range).