Vaisala BAROCAP PTB330 Podręcznik Użytkownika Pobierz pdf (Strona 80)

USER'S GUIDE____________________________________________________________________

78 __________________________________________________________________ M210855EN-D

DPMAX

The serial line command DPMAX shows or sets the maximum

permissible difference pressure allowed between barometer modules.

The command is only available if more than one barometer module

has been installed.

DPMAX [x] [y] [?]

where:

x = Pressure

y = Unit

Example:

>dpmax 0.2

Max. diff. : 0.20 hPa

If the defined value is exceeded, the relevant digits in the ERR field

(see FORM command) change from 0 to 1, and the corresponding

pressure measurement(s) are no longer included in the average

pressure reading.

Vaisala recommends using the ERR field as part of the

FORM

command definition if there are two or three pressure transducers in a

PTB330 series digital barometer.

The following basic cases may occur for barometers with two or three

pressure transducers (only the differences found between the readings

from the pressure transducers are important):

P high

≤ DPMAX ?

Two transducers: ≤ DPMAX ? Three transducers: P middle

P low

≤ DPMAX ?

P low

For an acceptable measurement crucial conditions are:

- two transducers: P high - P low

 DPMAX

- three transducers:

P high - P middle

 DPMAX and P middle - P low  DPMAX.

The factory setting for DPMAX is 1 hPa.

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Vaisala BAROCAP PTB330 Podręcznik Użytkownika Strona 80