Vaisala PTB220 Series Guide de l'utilisateur télécharger pdf (Page 19)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 13

NOTE

Remember to give the RESET command to initialize the new sending

mode.

MMODE Selecting the measurement mode

MMODE x <cr>

where:

x = NORMAL or FAST

The MMODE command is used to set or inspect the measurement

mode of the barometer. In the normal measurement mode, the

barometer measures the capacitance of each of the five capacitive

components of the pressure transducer (see page 6). This is the

standard operating mode of the PTB220 series digital barometers.

In the fast measurement mode, the barometer measures mainly the

capacitance of the BAROCAP



pressure sensor and results in a faster

measurement speed (approximately 10 measurements per second).

This measurement mode can be used only with the barometers having

one pressure transducer and full duplex communication.

MMODE selection is protected by switch SW4 (see FIGURE 4-1). The

switch SW4 is normally in DISABLE position (OFF). Turn the switch

to ENABLE position (ON) to be able to make a new MMODE

selection.

OFF

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

FIGURE 4-1 Switch SW4 in ENABLE position (ON)

Example of selecting the fast measurement mode:

>mmode <cr>

Meas mode : NORMAL

>mmode fast <cr>

Meas mode : FAST

>mtim 32 <cr>

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 112 113

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Vaisala PTB220 Series Guide de l'utilisateur Page 19