Applications; Setting Into Operation - IMG STAGELINE VU-80 Mode D'emploi

2. if a defect might have occurred after a unit was dropped
GB
or suffered a similar accident.
3. if malfunctions occur.
In any case, the VU meter and the plug-in transformer must
be repaired by authorized personnel.
If the units are used for other purposes than originally in-
tended, if they are not connected or operated in the correct
way or not repaired by authorized personnel, no liability for
any damage will be accepted.
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 permanently, take
them to a local recycling plant for disposal.

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.
8
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
"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 (os-
cillator) or a test CD with a corresponding 0 dB test signal.
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 in-
dicated for each channel.

5 Setting into Operation

Prior to connecting any units or to changing existing connec-
tions, switch off the VU meter.