Ac Voltage Measurement; Dc Current Measurement; Decibel Measurement - Velleman AVM460 Notice D'emploi

AC VOLTAGE MEASUREMENT

• Set the selector switch to one of the ACV positions: it is better to start with a
high current range and then switch down.
• Position the ends of the test probes on the circuit under test.
• 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
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.
• 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.
• Connect the ends of the probe across the circuit or part under test.
• 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).

DC CURRENT MEASUREMENT

• Set the selector switch to the 250m DCA position (always start with a high
range and then switch down).
• Insert the test probes in series with the circuit under test, ensure they are the
right way around.
• Apply power to the circuit under test and read the current from the current
scale.
Note: Do not attempt to read AC current.

DECIBEL MEASUREMENT

• Set the selector switch to one of the ACV ranges.
• For the 10VAC range, take the dB reading from the dB sale directly, but for
other ranges calculate the reading with the table:
dB range
ACV range
Add value
Note: For absolute dB measurement, the circuit impedance must be 600Ω.
0dB = 1mW dissipated in a 600Ω load
• For signals with a DC component, a capacitor (> 0.1µF) has to be connected
between the test probes and the circuit under test.
BATTERY CHECKER
• Set the selector switch to one of the BATT positions.
• Connect the probes to the battery, with the red lead to the + end and the black
to the - end.
• Check the battery against the GOOD/BAD scale (green or red).
13/02/2009
AVM460
-10 to 22
10V
0
4
4 to 36
50V
14
©2008 Velleman
24 to 56
500V
34
Components nv
®