Operation; Realtime Analysis Of Audio Signals; Noise Generator; Cleaning And Maintenance - Omnitronic AN-31 XL Bedienungsanleitung

6 OPERATION

1 Prior to switching on, turn the gain and pink noise control to minimum to avoid a possible switching-on
noise.
2 Switch on the unit with the power switch. The red power indicator lights up. Switch on the connected
units. Always switch on the power amplifier for the speakers last of all. When switching off the system,
always switch off the power amplifier first.

6.1 Realtime analysis of audio signals

1 For measurements with the supplied measurement microphone or another microphone set the rear input
selector switch MIC/LINE to position MIC and set up the microphone for operation.
2 For analyzing a unit connected to the line input, set the input selector switch MIC/LINE to position LINE.
3 Feed audio signals to the unit and read the signal levels on the LED meters.
4 The input sensitivity can be adjusted with the gain control.

6.2 Noise generator

By utilizing the integrated noise generator, a test signal (pink noise) can be created that can be used e.g. in
connection with an equalizer to match a PA system to room acoustics (see connection example in section
5.2).
1 Adjust the input sensitivity with the gain control so that none of the LEDs light while the control PINK
NOISE is set to minimum.
2 Run pink noise through the equalizer and turn up the control PINK NOISE until the noise signal just
overcomes ambient noise (e.g. from air conditioners or traffic). The LEDs of the analyzer display will
show a curve with the different frequency band levels.
3 Adjust extreme levels via your equalizer until a curve as flat as possible is indicated on the analyzer
meter. For this purpose, lower more pronounced frequencies and increase those frequencies that are not
so prominently featured, thus approximately achieving linear reproduction. Try to orient yourself on a
frequency whose signal level lies in the 0 dB to -3 dB range in order to avoid overdriving the subsequent
units.

7 CLEANING AND MAINTENANCE

We recommend a frequent cleaning of the device. Please use a soft lint-free and moistened cloth. Never use
alcohol or solvents!
There are no serviceable parts inside the device except for the fuse. Maintenance and service operations are
only to be carried out by authorized dealers.

7.1 Replacing the fuse

If the fine-wire fuse of the device fuses, only replace the fuse by a fuse of same type and rating.
Before replacing the fuse, unplug mains lead.
Procedure:
Step 1: Open the fuse holder on the rear panel with a fitting screwdriver.
Step 2: Remove the old fuse from the fuse holder.
Step 3: Install the new fuse in the fuse holder.
Step 4: Replace the fuse holder in the housing.
DANGER TO LIFE!
Disconnect from mains before starting maintenance operation!
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