IMG STAGELINE VU-800/SW Manual De Instrucciones página 10

•
For cleaning only use a dry, soft cloth, by no means chem-
icals or water .
•
No guarantee claims for the units or liability for any result-
ing personal damage or material dam age will be accepted
if the units are used for other purposes than originally in-
tended, if they are not correctly connected or operated or if
they are not repaired in an expert way .
If the units are to be put out of operation definitely,
dispose of the units in accordance with local reg-
ulations .
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
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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 when the system has been set to its opti-
mum level . For professional audio units, the nominal voltage
level (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 genera-
tor (oscillator) or a test CD with a corresponding 0 dB test
signal . You can also use the output signal of an audio unit
set 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 has been obtained when 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 indicated for each channel .