Operating instructions

3-16d) OVERALL RECALIBRATION PROCEDURE (continued)
STEP 3 - RECALIBRATE OUTPUT BOARD
With the bus levels held at -2dBu, the Output Board can be calibrated. Only the OUTPUT LEVEL trim pots need adjustment. The VU METER
DRIVER trim pots have already been done!
a) Select AUD on the Monitor Select Switch
b) Adjust the PGM trim pots until the PGM VU meters read “0VU”.
DO NOT TOUCH THE VU METER DRIVER TRIM POTS!! ONLY THE OUTPUT LEVEL TRIM POTS.
c) Adjust the AUD trim pots until the AUX VU meters read “0VU”.
STEP 4 - RE CALIBRATE INPUT MODULES
Each input module can now be calibrated to the station operating level you have chosen...“+4" in this case for line level and -55dBu for MIC inputs.
a) Connect the test tone to the first line level input module to be calibrated. The connection should be BALANCED. This should pose 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
module, and hook the GROUND from the signal generator to the (-) input on the module. This is effectively a balanced connection.
b) Calibrate the output of the tone generator to +4dBu = 1.23VRMS = 3.5Vpp.
d) Set the module‘s fader at the thick black line Turn on the channel & assign to PGM.
c) Adjust the input‘s trim pots such that the meters read 0VU.
d) Go on to the next input
e) Calibrate the MIC input modules with a small bladed screwdriver.
If all your audio source devices (cart machines, CD players etc.) are properly calibrated to your station operating level, all inputs will be correct. Confirm
calibration of the audio source devices. If there is a calibration mismatch either change the source‘s output levels or recalibrate the particular input module
in question to match the source. To interface the 1200 Series console to consumer level (-10dB) equipment, simply increase the gain on that particular
input module until the console‘sVU meters read “0VU”.
Recalibration is now complete!
NOTE: Problems with calibration can add hum, noise, pops & clicks, distortion etc. Call the Arrakis Analog Customer Service Dept. at the factory if you have these
symptoms or trouble with calibration.
3-16e) EXTERNAL MONITOR INPUT CALIBRATION
The External Monitor Inputs have trim pots which allow roughly 10dB of adjustment. To calibrate:
a) Feed a balanced signal into an External Monitor Input at your station operating level (typically +4dBu)
b) Press the Monitor Select switch for the input you are feeding (EXT 1 or EXT 2)
c) Adjust the right and left trimpots such that the AUX VU meters read 0VU
d) Repeat for other input
Arrakis Systems, inc. --- 6604 Powell st., Loveland, CO 80538 --- 970-461-0730 --- www.arrakis-systems.com
INSTALLATION PROCEDURES
CALIBRATION (continued) 3-16)
3.27