Vaisala PTU300 Guia do Utilizador descarregar pdf (Página 59)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 57

where:

7 = Decreasing (steadily or unsteadily); atmospheric pressure

now lower than three hours ago

8 = Steady or increasing, then decreasing; or decreasing then

decreasing more rapidly; atmospheric pressure now lower

than three hours ago

Source: The World Meteorological Organization (WMO)

publication Manual on Codes Vol. I.1, International

Codes, Part A - Alphanumerical Codes, 1995 Edition,

WMO - No. 306. Section C, Code Table 0200: a.

Using Serial Line

Pressure 3h trend and tendency reading is also available through serial

line. Key in the lines below:

>form "P=" p "trend=" p3h "tend=" a3h #r#n

>send <cr>

P= 1024.7trend= 0.8tend=1

The last line shows the values.

For more information on the Form command, see the section

Changing Quantities and Units, starting on page 73.

Missing trend

In addition to this the PTU300 series barometers output a code "*"

when the pressure tendency has not yet been calculated that is, less

than three hours have elapsed since the power-up of the barometer.

The absence of the pressure trend is indicated in a similar manner, too.

NOTE

When the P

tendency is chosen as a display quantity, the PTU300

logs actual measured pressure, instead of trend or tendency value.

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Vaisala PTU300 Guia do Utilizador Página 59