AMIX AFF04 Manuel Utilisateur page 28

SPL10 DESCRIPTION
4 : Choice of the frequency weighting A or C for the acoustic measurement.
A weighting is the sensitivity of the human ear for low levels.

C weighting is the sensitivity of the human ear for high levels.

 If you want to measure sound levels below 85dB, use A weighting.
The A-weighted trigger range is 40 dB at 117dB and is selected by 6.
 If you want to measure higher sound levels, use the C weighting. The C-weighted trigger range
is 60 dB at 117dB and is selected by 6.
Due to the extended bandwidth in the bass, the C weighting, associated with lower levels, may
give incorrect information.
5 : Choice of weighted time Leq. This is actually how long the calculator will do the average of
acoustic signals.
 If you want to react to the display on short sound events you have to choose a time
short as Fast, 5s or 10s.
 If you want to see the display reacting to more sustainable events over time, you need to
choose a longer time. 1min, 5min, 10min or more.
Leq
6 : Selection of the trigger level in decibel. The display will change to position B (see page 5), when the
acoustic level will be identical to this value. This threshold is adjustable from 40 dB to 117 dB.
The small switch lever gives the choice of hundreds 0 or 1.

The rotary switch immediately on the right gives the choice of tens.

The rotary to the right gives the choice of units.

Threshold (dB)
1
0
Hundred Ten
AMIX
Leq
Depending on the position of the coding wheel (0 to 9), the
0
FAST
following Leqs are selectable: Fast, 5s, 15s, 30s, 1min, 5 min,
1 5
S
10min,15min, 30min, 1H.
2 15
S
3 30
S
4 1 mn
5 5 mn
6 10 mn
7 15 mn
8 30 mn
9 1 H
Unit
Example :
The position of the wheel is 5, so
the selected Leq is 5min
1
Example : 98dB
Hundred
8
on
1
0
Ten Unit
Figurative display
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