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021814/03/21
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Page 12 of 86
If the measured actual wind velocity is between 2 entries of the table, the wanted target wind
velocity is determined by linear interpolation.
If the measured actual wind velocity is outside the table range, the Bit2 is set in the status
word and the standard curve is interpolated as follows:
-
Is the measurement below the curve range, we have to interpolate between the start-
ing point of the standard curve and the first table value.
-
Is the measurement above the curve range, we have to interpolate between the last
table value and the wind velocity 75m/s at the standard curve.
For the calculation of the corrected wind velocity, the calibration table last created is used.
Note:
After setting the time stamp, the calibration table can no longer changed
.
Please see the question and answers in FAQ
4.1 Case 1 Using Standard Characteristic Curve acc. to Classifica-
tion
The optimum way would be as specified below:
Ia. First you must specify whether you want to use the frequency output (pin 1) or serial
output to get your data
Ib. Calibration must be done without regard to the air pressure. For calibration you must
tell what kind of output you want to use in operation:
frequency output (pin 1)
calibration data: wind velocity corrected by standard
characteristic curve at pin 1; FO2
serial output
calibration data: wind velocity corrected by standard characteristic
curve at telegram 2 pos. 11
Ic. Let the linear regression analysis (slope / offset) on the calibration certificate be done
for the calibration data
Note:
Steps Ib. and Ic. will be done automatically if you order the calibration according to Thies art.
no. E433524X0 2.3 (for frequency output (pin 1); see picture 2) resp. E433524X2 2.3 (for se-
rial output; see picture 3).