Velleman AVM2050, User Manual, Page: 4 / 39

AVM2050
V. 02
–
18/04/2016 4 ©Velleman nv
selector range selector range
60 dB 50-66 dB 100 dB 90-106 dB
70 dB 60-76 dB 110 dB 100-116 dB
80 dB 70-86 dB 120 dB 110-126 dB
90 dB 80-96 dB
Example: when the RANGE selector is set to 80 dB and the pointer
points to -3, the sound level is 77 dB.
7. Output

You can connect the AVM2050 to recording or other equipment through
the OUTPUT connector. For example: use an audio cable to connect the
device to an AUX or LINE input of a recorder.

Always bear in mind that the output signal is influenced by the internal
filtering process.

Set the RANGE selector to a value for which the maximum deviation of
the meter is never more than +4 to prevent the internal amplifier from
removing the signal. Use the A weighting for recordings with voices and
the C weighting for entirely instrumental recordings. Connect the output
with high impedance headphones, an oscilloscope, a frequency analyser
or any other measuring instrument.
8. Response Time

The response switch has 2 positions: FAST and SLOW.
o
FAST makes the meter react fast to sudden changes is the sound
level. This position is ideal for peak measurement.
o
SLOW is used for average noise level measurements. Short sound
surges have little effect.
9. Weighting

The WEIGHTING switch is used to measure the sound level for a specific
frequency range.
o
A-weighting means the meter will be measuring predominantly in
the 500-10.000 Hz frequency range. This range corresponds to the
frequencies most audible to the human ear.
o
C-weighting concentrates on fixed sound levels between 32 and
10000 Hz; these are sound sources with a constant frequency and
sound level.
10. Microphone

The measurements are most accurate when the meter is directed
directly towards the sound source.