IMG STAGELINE VU-800/SW Mode D'emploi page 8

GB
G
No guarantee claims for the units or liability for any resulting
personal damage or material dam age will be accepted if the
units are used for other purposes than originally intended, if
they are not correctly connected, operated or not repaired in
an expert way.
G
For cleaning only use a dry, soft cloth, by no means chemi-
cals or water.
If the units are to be put out of operation definitively,
take them to a local recycling plant for a disposal
which is not harmful to the environment.
3 Applications
This stereo VU meter serves as control display for level adjust-
ment of PA and disco systems. The three-colour level display
of 40 LEDs each per channel can be switched from bargraph
to dot display (BAR / DOT) and vice versa.
The VU meter has especially been designed for installation
into a rack (482 mm / 19"). However, it can also be used as a
table top unit, if required. For rack installation, a height of
1 rack space = 44.45 mm is required.
4 Basic adjustment of the VU-Meter
Prior to level measurement of a music system, the VU meter
must be adjusted via a test signal in such a way that the LEDs
8
"0 dB" will light up if the system has been controlled to its opti-
mum level. For professional audio units, the voltage level for
optimum control (0 dB range) is 0.775 V or 1 V.
1) Feed a 1 kHz sine signal of 0.775 V or 1 V to the input jacks
AUDIO IN (6). For this purpose, use a tone generator
(oscillator) or a test CD with a corresponding 0 dB test sig-
nal. You can also use the output signal of an audio unit con-
trolled to 0 dB.
2) Connect the VU meter to the power supply, switch it on and
select the desired display mode [see chapter 5 "Setting into
Operation", items 3) and 5)].
3) An optimum adjustment is obtained if the level display (3)
indicates 0 dB. In case of a higher or lower level value, the
VU meter must be adjusted via the sensitivity controls
ADJUST (1); the upper control for the left channel and the
lower control for the right channel: Use a small screwdriver
to turn the two trimming controls until the level 0 dB is indi-
cated for each channel.
5 Setting into Operation
Prior to connecting any units or to changing existing connec-
tions, switch off the VU meter.
1) Connect the stereo input AUDIO IN (6) to a line level output
of the unit of which the level is to be indicated, e. g. effect
unit, mixer.