Vaisala PTB220 Series Guia do Utilizador descarregar pdf (Página 40)

USER'S GUIDE_______________________________________________________________________

34 ___________________________________________________________________ M210194EN-A

An external power control can be used to switch the PTB220

barometer ON/OFF. The control is activated with the switch SW2 in

position ON as shown in FIGURE 4-4. The TTL signals are: 0VDC OFF

and 5VDC ON.

ON

OFF

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

S

1

FIGURE 4-4 External power control ON

The pulse output mode is activated and the barometer starts to wait for

an external trigger pulse by turning the switch SW3 in position ON as

in

FIGURE 4-5. See Appendix D for quick reference information on how

to set and use the pulse output mode of the PTB220 series digital

barometers.

ON

OFF

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

S

1

FIGURE 4-5 Pulse mode ON

NOTE

Switches SW6 and SW7 are usually in position OFF. However, for

some specific uses they may be turned ON to emulate other

barometers (see page 103 for further details).

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