Vaisala PTB210 SERIES Manuel d'instructions télécharger pdf (Page 49)

Calibration Factors and Oﬀsets

Calibration factors and oﬀsets are important parameters which have to be deter-

mined for converting analog signals into engineering units. The parameters are cal-

culated due to the voltage output ranges referring to their output range for metoro-

logical data according to a simple equation system:

xU(V )

− y = z

(4.1)

xU(V )

− y = z

(4.2)

• U(V )

= voltage output for the lower bound of measurement range

• U(V )

= voltage output for the upper bound of measurement range

• z

= lower bound of measurement range

• z

= upper bound of measurement range

• x = multiplier

• y = oﬀset

The engineering unit for global solar radiation is calculated with its spectral sensi-

tivity according to equation 2.2 on page 21.

In reference to the manufacturer’s data the following parameters in Table 4.3 were

calulated, deﬁned as constants and included in the program sequence for converting

the outputs.

Sensor Calibration Factor Offset

KPC 1/6 ME Temp. 0.1 30

KPC 1/6 ME Humid. 0.1 0

14577 Wind Speed 0.03125 12.5

CMP3 Pyranometer 75.13148 0

Table 4.3: Calibration Factors and Oﬀsets

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 136 137

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Vaisala PTB210 SERIES Manuel d'instructions Page 49