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23. Calibration
Your Assimil8or module comes pre-
calibrated from the factory. You should only
recalibrate it for specific reasons.
If your system is already consistently
calibrated to a 1V/octave standard, it might be
that the factory calibration does not exactly
match your system. In this case, you can
calibrate your Assimil8or to the precision
voltage standard you use for your system.
Alternatively, you can use Assimil8or’s precise
factory calibration to tune the other sources
in your system.
If for some reason your Assimil8or has
specific calibration issues, such as a single
inaccurate CV channel, or an input or output
with non-zero DC offset, you can also
calibrate individual inputs and outputs.
The Assimil8or also allows you to check the
calibration of its 24 CV inputs and the offset
of its sample inputs.
In all cases, please read these instructions
completely before beginning calibration.
Adjusting the output and sample input
voltage offsets (but not 1V/octave sensitivity)
is very easy and requires nothing special.
If you want to calibrate your Assimil8or to
your local 1V/octave (what we are really doing
is making your Assiml8or and the rest of
your system agree as to what is considered
one Volt), you will need an accurate source
of both +4.000V and -4.000V. A Rossum
Electro-Music Control Forge module is ideal
for this purpose, but any source that can
accurately 4.000V and -4.000V will
do. You may need to use a precision inverter
to get -4.000V if you only have a +4.000V
precision source. Make sure your voltage
source has essentially zero ohms output
impedance!
CRITICAL NOTE:
If you do not have a
way to apply pre4.000V and
-4.000V to the Assimil8or, don’t try to
re-calibrate the CV inputs.
Eurorack systems vary greatly in the quality
of their grounding. Check Assimil8or’s
ground by adding patch cords between
unused inputs across modules while you
are checking your calibration. If the voltage
changes significantly as you add patch cords,
your system’s grounding is at fault. There
may not be too much you can do about it,
but using a short power cable to Assimil8or
is particularly important. If you have
questionable grounding, and want to take
advantage of the Assiml8or’s CV accuracy, be
sure to use good, thick patch cords, and use
them to connect as many grounds as you
can between Assimil8or and the sources of
your precision CVs. Patching unused inputs
between CV source and destination modules
is a good way to add grounds.
To begin calibration, press
UTILITY
, scroll
down to
“Calibrate,”
and press the encoder.
Press the encoder again when you are ready
to proceed. (Note that at any point you can
exit calibration by pressing the
UTILITY
button, and until you’ve chosen to save your
new calibration, nothing will be changed.)
At this point, you
can check the
calibration of
your Assimil8or.
To check a CV
channel, apply a
known voltage,
and rotate the
encoder to
select the input
you are using.
Assimil8or’s CV
inputs should be accurate to 2-3mV over a
-5V to +5V range.
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