Velleman AVM460 User Manual - page 4
AVM460 GB
4
DC CURRENT MEASUREMENT
1. Set the selector switch to the 250m DCA position (always start with a high range
and then switch down).
2. Insert the test probes in series with the circuit under test, ensure they are the right
way around.
3. 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
1. Set the selector switch to one of the ACV ranges.
2. 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
-10 to 22
4 to 36
24 to 56
ACV range
10V
50V
500V
Add value
0
14
34
NOTE: For absolute dB measurement, the circuit impedance must be 600Ω.
0dB = 1mW dissipated in a 600Ω load
3. 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
1. Set the selector switch to one of the BATT positions.
2. Connect the probes to the battery, with the red lead to the + end and the black to the
- end.
3. Check the battery against the GOOD/BAD scale (green or red).