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Calibrating CV Inputs
To calibrate these controls, the buttons must be set when the external control device is set at its operating maximum and mini-
mum positions. For example, in the case of a rotary control acting as a variable resistor, these positions would be full counter
clockwise for absolute minimum, and full clockwise for absolute maximum. When the control is at these positions, the scale of
the raw input value should track likewise. In order to properly calibrate the control, the control should be installed in its final
position with the wire and terminations that will actually be used on the jobsite. You may need two people and radios to prop-
erly accomplish this procedure on most jobsites, one person at the control location, the other at the MediaMatrix
10V
V1
1
10V
V3 1
CV INPUTS
STEP 1: Ensure that all connec-
tions are permanent and proper-
ly terminated.
TURN
CW
STEP 4: Turn the rotary control
completely to its maximum
position, or whatever position
would be considered full "ON".
MediaMatrix - A Division Of Peavey Electronics Corp.
STEP 2: Turn the rotary control
completely to its minimum posi-
tion, or whatever position
would be considered "OFF".
SET
STEP 5: Press the Set Max but-
ton for that port within the X-
Frame™ 88's software control
panel within MediaMatrix. The
max value in this example is 116,
which again is short of the max
value of 255. Do not be con-
cerned about these discrepancies
in the range. The point is to cali-
brate your control to the software
so the control will track correctly.
TURN
CCW
SET
computer.
®
STEP 3: Press the Set Min but-
ton for the appropriate port.
NOTE: In this example, the mini-
mum value is 45. This is typical,
as it represents the total resist-
ance to the control voltage. The
resistance includes the loss across
the wire, termination points, etc.
Do not be alarmed if your
min/max values do not reach the
limits of 0 or 255.
Now operate the external rotary
control and observe the range in
the Raw Input indicator. If you
calibrated the control to its maxi-
mum (full clockwise & counter-
clockwise) travel, then the high
and low limits of this range
should match the values now
showing in the Set Min and Set
Max indicators. Repeat this pro-
cedure for each externally con-
nected control in your system.
Page 37
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