Arrakis Systems MARC-15 Manuel télécharger pdf (Page 52)

I N S TA L L A TI O N I N S T R U C TI O N S

Basic Calibration

WARNING

The console has been calibrated at the factory to normal +4dBu levels and should not require field calibration. Usually, it is better

to adjust the level out of the source device than to adjust the console trim levels. That is so that the source can be plugged into

any module without requiring recalibration of the module. Field calibration should only be done with proper test equipment and by a

qualified audio technician.

a) INPUT SOURCE MODULE LEVEL ADJUST

Trimpots for all input module levels are located under the meter panel. These are provided for convenience in adjusting levels to

match an unusual source device. In general, it is highly recommended to adjust the level out of the source device to match +4dBu

rather than adjusting the trim level for the module. That is so that the source can be plugged into any module without requiring

recalibration of the module.

1) MIC MODULE: a trimpot is located under the meter panel for both the ‘A’ and ‘B’ mic inputs. These trim pots are set at the fac-

tory for typical microphone gain levels. These trim pots can be adjusted if different mic gains are required. To adjust, the simplest

method is to speak into the mic and adjust the trim pot with a small straight edge screwdriver until the desired gain is reached.

2) STEREO LINE MODULE: left and right trimpots are located under the meter panel for both the ‘A’ and ‘B’ inputs. The trimpots

adjust level from -16dBu to +22dBu. They are set at the factory for +4dBu balanced. It is highly recommended to adjust the level

out of the source device to match +4dBu rather than adjusting the trim level for the module. That is so that the source can be

plugged into any module without requiring recalibration of the module.

3) PC-USB MODULE: there are no trimpots on the PC-USB module. This is because the audio levels are determined by the PC soft-

ware. The analog record input is calibrated for +4dBu so that it can be fed by any of the three main buses: Pgm, Aud, or Utl.

4) PHONE MODULE: input and output level trimpots are located under the meter panel. The trimpots adjust level from -16dBu to

+22dBu. They are set at the factory for +4dBu balanced. It is highly recommended to adjust the level out of the source device to

match +4dBu rather than adjusting the trim level for the module. That is so that the source can be plugged into any phone module

without requiring recalibration of the module.

b) OUTPUT MODULE LEVEL ADJUST

Output module level adjustments are NOT provided on the front of the output module, under the meter panel. This is because these

levels are critical to maintain headroom in the console and are factory set for maximum console performance. The output levels

are set at the standard +4dBu balanced. If the station uses a different level such as +0dBu, it is recommended to contact the fac-

tory where the +0dBu level will be calibrated at the factory before it ships.

1) PGM, AUD, UTL BUS LEVELS: The level trimpots are on the back of the output module so that field calibration can be accom-

plished by a qualified technician with appropriate test equipment. The default factory level is +4dBu.

2) MONITOR, HEADPHONE OUTPUTS: The level trimpots are on the back of the output module so that field calibration can be

accomplished by a qualified technician with appropriate test equipment. The default factory level is +4dBu.

3) EXT1 INPUT TO MONITOR SELECTOR SWITCH: The level trimpots are on the back of the output module so that field calibration

can be accomplished by a qualified technician with appropriate test equipment. The default factory level is +4dBu.

c) VU METER ADJUSTMENT

The VU meters are factory set for +4dBu at 0VU. These levels should not be changed from factory settings unless directed by fac-

tory service technicians. The trimpots are located on VU meter driver boards in the VU meter panel.

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Arrakis Systems MARC-15 Manuel Page 52