Vaisala PTB220 - Manual (Page 35)

C HAPTER 4_____________________________________________________________ COMMISSIONING
V AISALA _________________________________________________________________________ 29
Example of defining a similar command without an end character:
>scom
"P" #r
? "P"
>P1020.30 hPa
>
Any previous SCOM definition may be removed with the following
command:
>scom *
>
PSTAB Setting the pressure stability indicator
PSTAB x
where:
x = pressure reading (in current unit)
The PSTAB command is used to define the pressure stability indicator
reflecting maximum allowed pressure difference between two
successive averaged pressure measurements. In addition to defining
the pressure stability indicator, the user must also define the FORM
command to include the "OK" stability indicator field. The factory
setting for the stability indicator level is 0.5 hPa.
>pstab 0.5
Stab. level
: 0.50 hPa
>form
? 4.2 P " " UUU " " OK #r #n
>send
1020.30 hPa OK
(good pressure stability)
>send
1020.30 hPa
(poor pressure stability)
>
The pressure stability indicator is useful as it indicates instability in
the pressure measurement. The pressure instability may result from
different reasons depending on the application. In outdoor barometric
pressure measurement high wind speeds can induce notable pressure
instability. Building automation systems may also introduce pressure