Internal Calibration
The SeaDaq has an internal calibration circuit for the calibration
of all the analog input channels. This is shown below. In addition this can be
used as a test pattern generator. 
The input circuitry shown above consists of two multiplexers. The
first selects between direct input and reference signal. The second selects
between positive, zero and negative input. This is a 3 point calibration
system. values measured by the ADC are then used to calculate the gain settings
in the software.
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