μmol s-1 m-2 ADC counts (bit)
0.0 0.0
2087.048832 131072
From the above table of data, the offset and slope coefficients to be entered during the PAR calibration
procedure must be calculated by the operator. This can be done using the “Interpolate” tool distributed
with the IDRONAUT ITERM program or by using the probe calibration procedure.
Selecting the PAR sensor from the list of sensors, the following calibration procedure arises:
Do you already know 'SLOPE & OFFSET' coefficients?: No
The operator can decide to enter the calibration coefficients received with the probe or to let the probe
calculate new coefficients using the table calculated as above described.
By answering <YES>, the following messages appear in sequence:
Offset = 0.0 Slope = 1.0
The operator must enter the offset and slope coefficients, while by answering <NO> the following
message appears:
Number of calibration points:0 enter new value< 2
The operator must answer using the tabled data:
Sample value (units)
Sample reading (bits)
The above questions about the units and bits are repeated for the number of “Calibration points”
entered. Afterwards, the probe shows the result of the linear interpolation:
PAR = a + bx
offset = 0.0
slope = 1.0
r correlation coefficient = 1.0
c % of variability = 100%
The operator can now confirm or modify the offset and slope coefficients.
Offset = 0.0 Slope = 1.0
In the end, the list of sensors appears again.
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