AVProAlliance AViMUX4 Manual de funcionamiento y aplicación - Página 13

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Microphone Input Calibration Controls

The calibration control for each microphone input is located beside each of the MIC IN jacks.
The CAL controls are multi-turn pots, adjustable with a miniature screw driver (not provided).
Multiplex
CAL 4
Rate
MIC 4 IN
OUTPUT
Figure 9. Calibration controls on each microphone
input provides level adjustment for accurate
measurements
The calibration controls are used to adjust
the level from each microphone input to the
iMUX4. Each microphone and its respective
input should be calibrated to a reference
level before using the iMUX4. This insures
that each microphone and its respective
input of the iMUX4 is providing a proper
level to the RTA.
The microphones supplied with the iMUX4
are labeled as MIC 1, MIC 2, MIC 3, and
MIC 4. Your iMUX4 comes pre-connected
to the proper cables and microphones;
observe the color coding when reconnecting;
Mic 1: Red, Mic 2: Blue, Mic 3: Green, and
Mic 4: Yellow. You should periodically
verify
proper
calibration
procedures below. Microphones can change
over time and use so it's essential to check it
for best accuracy of your measurements.

iAI2 Microphone Calibration

The microphone calibration controls in
Studio Six Digital AudioTools App are
located in the "Settings" menu under
"Microphone Setup". Once you have your
system properly connected and powered up
you should see the iAI2 microphone
indicated as an input source option. Select it
by touch indicated by the field becoming
CAL 2
CAL 3
MIC 3 IN
MIC 2 IN
MIC 1 IN
using
yellow. Select the blue arrow on the right
for the calibration menu.
1. Select Mic 1 on the iMUX4.
2. Insert
CAL 1
microphone calibrator with sound seal
grommet ~.75 inch from end (see picture
pg. 7) and select the 94 dB test tone on
the calibrator.
3. In
Calibration menu:
a. Switch the 48v phantom power to on
and select reverse polarity. Confirm
the LED is lit for Mic 1.
b. Select Low Range and set the Gain
Setting to 35 dB for starters.
c. Now touch the dB level box. This
will reveal the iPad keyboard. Enter
94 dB and touch "Done". This will
change the trim box to the required
trim.
d. If the trim is between -2 and -7 dB
you've got it. If not, try a different
Gain
procedure.
4. Now, move the microphone calibrator to
Mic 2 and select Mic 2 on the iMUX4.
5. Adjust the trim screw near the input on
the iMUX4 until this Mic also reads 94
the
dB in AudioTools. Don't change the
trim in AudioTools.
6. Repeat for all microphones.
You may find that you'll need to readjust
Mic 1's trim control up or down if you do
not have enough adjustment available on the
other trim screws. NOTE: Add a new input
source in AudioTools and calibrate this for
Mic 1 connected directly to the iAI2
(bypassing the iMUX4) for low noise
requirements. This is desired for ambient
noise or ETC measurements.
12
the
microphone
the
AudioTools
Setting
and
into
the
Microphone
repeat
the