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Sensor Tables
Figure 177. Sensor Type Configuration
For sensors that either do not provide ouput voltages depending
linearly on the measured variable, or that provide output voltages
which must be converted into discrete output values, you have to
define appropriate tables for conversion/linearization. Each sensor
output voltage value becomes an input value of the table; a con-
version table may contain from 2 to 256 input values and also from
2 to 256 output values. Of course, the numbers of input and out-
put values must match, each table input and its corresponding
output value specifying a data point on the conversion diagram.
For example, the leaf wetness sensor outputs a
voltage (which has a certain non-linearity), but
the leaf wetness value is expressed in discrete
values of 1 to 10 .SFU. units.
CHAPTER 4
Sensor Type Configuration
171
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