Arrakis Systems X-mixer-14-22 Operations Instructions download pdf (Page 41)

3-16a) GENERAL CALIBRATION

- The console has gain adjustment trim pots on each input channel, and the output amps.

- Line level input channels have trim pots which independently adjust left and right channels. There is

approximately 20dB of trim available allowing the

module to accomodate input signal levels ranging from -

10dBV (consumer) to +8dBu (professional).*

- MIC level input channels have approximately 30dB of trim and can accomodate MIC level signals from -

65dBu to -35dBu.

- The output amp has a trim gain adjust of roughly 10dB. The console can be set up to operate at nominal

station operating levels ranging from

0dBu to +8dBu.

- The Cue and Monitor Outputs have fixed gain, although the External Monitor Inputs are adjustable.

3-16b) FACTORY PRESET LEVELS

The console is factory pre-calibrated for +4dBu IN = +4dBu OUT = 0VU. Therefore, when a +4dBu

balanced signal is applied to a

line input module and the fader is set at the thick black line, then the VU

meters will read 0VU and the console will be sending out a +4dBu

balanced signal. MIC inputs are

calibrated for -55dBu IN = +4dBu OUT = 0VU.

3-16c) ADJUST FOR YOUR STATION LEVEL

If your station operating level is somthing other than +4, then the console will need to be adjusted. Simply

recalibrate the VU meters to reflect your nominal

station level (“0VU”).

DO NOT TOUCH THE

OUTPUT LEVEL

TRIMPOTS!!! ONLY THE

VU METER DRIVER

TRIMPOTS NEED

BE ADJUSTED.

See the following pages for VU meter trim pot locations.

CAUTION -

Trim pots are very easily bumped out of calibration so take care to not touch the wrong ones.

VU METER RECALIBRATION PROCEDURE

a) Generate a test tone and feed this tone BALANCED into an input channel. This should be no

problem if you have a balanced test tone. If your tone

generator has unbalanced outputs hook the

SIGNAL lead from the tone generator to the (+) input on the channel, and hook the GROUND from

the signal

generator to the (-) input on the channel. This is effectively a balanced connection.

b) calibrate the output of the tone generator to your chosen station operating level using a voltmeter.*

d) set the channel

fader at the thick black line.

Turn on the channel & assign to PGM.

e) select PGM on the Monitor Select Switch

c) adjust the VU METER DRIVER trim pots such that the meters read 0VU.

The outputs of the console will now be at your station operating level when the VU meters read “0VU” and

the console‘s internal gain structure

has preserved.

Note that the input module did not require adjustment nor did the console output trimmers

Only the VU METER DRIVER

trim pots were adjusted.

NOTE

- 0dBu = 0.775 VRMS with no load. dBu is compatible with all active-balanced equipment (low

Zout, high Zin). If 600 ohm transformer

balanced equipment is used, these calibration levels may change.

-10dBu = 0.245VRMS

0dBu = 0.775VRMS

+4dBu = 1.225VRMS

+8dBu = 1.945VRMS

IMPORTANT -

Some voltmeters are optimized for 60 cycles and will not be accurate at midband audio

frequencies (1kHz).

Arrakis Systems, inc. --- 6604 Powell st., Loveland, CO 80538 --- 970-461-0730 --- www.arrakis-systems.com

INSTALLATION PROCEDURES

CALIBRATION

3-16)

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Arrakis Systems X-mixer-14-22 Operations Instructions Page 41

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