Campbell SAT ARGOS Manual de usuario Pagina 181

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 173
In the case of parabolic (or near-parabolic) sensor outputs, three sensor voltage readings along with their
corresponding scaled values must be known in order to calculate the three coefficients A, B and C:
The three sensor voltage readings are defined by v
1
, v
2
and v
3
.
The three corresponding scaled values are defined by x
1
, x
2
and x
3
respectively.
First, calculate the divisor named DIV:
Coefficients A and B are calculated by the next two equations:
Coefficient C is calculated using the next equation once coefficients A and B are calculated:
From the previous example, if the value in engineering units is actually 150 degrees at 1.25 VDC instead
of 177.5 degrees at 1.25 VDC, a parabolic approximation will provide better accuracy for converting the
sensor voltage to engineering units:
For this example, if you set coefficients A, B, and C to the values 17.6, 98, and 0 respectively, you will
obtain the correct values in engineering units from the parabolic sensor.
You can reset the calibration coefficients within the Test Menu without
going into the Zeno Program Menu and stopping data sampling.
194
10.4. DEFINING THE DATA PROCESSES
The ZENO
®
-3200 provides a large library of processes that allow you to process the collected sensor data
in innumerable ways. Defining a Process Record is done via the Process Menu which is accessible from
194
Refer to Section 7.2 for details.

21
2
313
2
232
2
1
vvvvvvvvvDIV


DIV
vvxvvxvvx
B
DIV
vvxvvxvvx
A
2
1
2
23
2
3
2
12
2
2
2
31
213312321
1
2
11
BxAxvC



009806.170
98
90625.3
025.13555.2015025.15.20
6.17
90625.3
25.103555.201505.225.10
90625.325.105.205.225.15.225.10
3551500
5.225.10
22
222222
222
321
321
C
B
A
DIV
xxx
vvv
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