Vaisala PMB100 Manual do Utilizador descarregar pdf (Página 10)

USER'S GUIDE_______________________________________________________________________

10 ___________________________________________________________________ M010035EN-A

In pressure calculation, normalized voltage (V

) and temperature (T

)

are required. The normalization of the parameters is performed by

using the equations 1 and 2.

[]

1...1,12 −∈−

⋅=

ref

out

V (1)

[]

1...1,

128

0 −∈−=

T (2)

Constant T

is found in the list of coefficient or in the EEPROM.

Normalized pressure P

is calculated according to the equation 3. All

the module specific coefficients are available in the list of coefficients

supplied with each module or in the EEPROM.

[]

1...1,

1211

0201

201000

−∈

⋅⋅+⋅⋅+⋅⋅+⋅⋅+

⋅+⋅+

⋅+⋅+⋅+

⋅=

nnnnnnnn

nnn

TVaTVaTVaTVa

TaTa

VaVaVaa

(3)

Compensated pressure P is then calculated by using the equation 4.

950150 +⋅=

PP hPa (4)

Offset/Gain corrections

A final offset/gain correction against a high-class pressure standard is

recommended as a final touch. The offset and gain adjustments are

done after the pressure calculation by the user's host system.

1 2 ... 5 6 7 8 9 10 11 12 13 14

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