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Sound Level Measuring System
These operating instructions are intended for users with
basic knowledge in audio technology . Please read the
instructions carefully prior to operating the unit and
keep them for later reference .
1 Applications
The measuring system LEVELMAX-1 is designed for
sound level monitoring and recording in high-volume
environments (in discos, at dancing events, etc .) . If the
threshold values previously defined are exceeded, the
system will give a warning by changing the colour of
its display background so that corresponding counter-
measures may be taken in time .
Scope of delivery
– measuring box LEVELMAX-1
– plug-in power supply unit 12 V (⎓) / 500 mA
(Replacement: PSS-1205DC)
– measuring microphone with 33 m connection ca ble,
BNC plug connection
– 2 m audio connection cable with 2 × 3 .5 mm mono plug
– program CD with the software "dBmess Disco" and
two audio test signals
2 Safety Notes
The measuring system corresponds to all relevant direc-
tives of the EU and is therefore marked with
WARNING The plug-in power supply uses danger-
ous mains voltage . Leave servicing to
skilled personnel only . Inexpert handling
of the unit may result in electric shock .
•
The system is suitable for indoor use only . Protect
it against dripping water, splash water and high air
humidity . The admissible ambient temperature range
is 0 – 40 °C .
•
Do not operate the measuring box and immediately
disconnect the power supply unit from the mains
socket
1 . if the measuring box or the power supply unit is
visibly damaged
2 . if a defect might have occurred after the unit was
dropped or suffered a similar accident,
3 . if malfunctions occur .
In any case the system must be repaired by skilled
personnel .
•
For cleaning only use a dry, soft cloth; never use
chemicals or water .
•
No guarantee claims for the measuring system and no
liability for any resulting personal damage or material
damage will be accepted if the measuring system is
used for other purposes than originally intended, if
it is not correctly connected or operated, if it is not
repaired in an expert way or if the software is not
correctly installed .
If the measuring system is to be put out of op-
eration definitively, take it to a local recycling
plant for a disposal which is not harmful to the
environment .
6
3 Connection
1) Connect the BNC plug of the cable of the measur-
ing microphone to the BNC jack of the LEVELMAX-1
measuring box and lock it .
2) With the audio connection cable, connect the
3 .5 mm output of the measuring box to an audio
input of the computer . Usually, the microphone input
may be used . In exceptional cases, use the line input
if the sensitivity of the microphone input is too high .
Important: In the software setting for the sound
card, activate the audio input used and deactivate
all other inputs .
3) Connect the plug-in power supply unit to the low-
voltage jack of the measuring box and to a mains
socket (230 V/ 50 Hz) .
4) Switch on the measuring box with the Power/ Reset
switch .
Notes:
1 . In case of power interruptions of less than 3 se conds,
e . g . by mains failure, actuate the Po w er/ Reset switch
to restore the correct operating state of the measuring
box . In case of longer interruptions, e . g . when the unit
was switched off between two measurements via a main
switch, the unit will automatically return to the correct
operating state .
2 . The power supply unit will have a low current consump-
.
tion as long as it is connected to a live socket .
4 Software Installation
The measuring program can be operated on a PC with
a Windows operating system (Windows 98 or later) and
an integrated sound card .
Windows is a registered trademark of Microsoft Corporation in
the United States and other countries.
1) Insert the program CD into the corresponding drive
of the computer and start the file "SETUP .EXE" via
the Windows Explorer . Then follow the installation
instructions . The serial number to be entered can
be found on the label of the CD cover . It is recom-
mended to include the program in the Autostart
folder .
2) After successful installation, start the program
"dBmess Disco .exe" .
3) The menu languages available are German, Eng lish,
and French . Select a language in the menu "Lang-
uage" . The online help (to be called up with the key
F1), however, is available in German only .
5 System Calibration
First always perform a one-time calibration at the place
where the sound level is to be monitored . This calibra-
tion depends on the kind of later measurement:
1. Direct measurement: The sound level is meas-
ured directly at the place where the sound level is to
be monitored, e . g . at ear level in the centre of the
dance floor . For this purpose, proceed as described
in chapter 6 .1 .
2. Indirect measurement: If the microphone is in the
way when set up directly at the place where the
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