Vaisala PTB220 - Manual (Page 32)

U SER ' S G UIDE _______________________________________________________________________
26 ___________________________________________________________________ M210194 EN -A
where:
P = measured pressure
0.1176 = constant
h = height
Example of setting the height:
>hhcp<cr>
Height of HCP : ? -30
>
AVRG Setting the averaging time
AVRG x <cr>
where:
x = 1 ... 600 (seconds)
The AVRG command is used to set and inspect the averaging time
during which the individual measurement samples are integrated to
get an averaged pressure reading. The averaging time is the total
averaging time of the barometer. In case of several integral pressure
transducers, the defined averaging time is divided by two or three to
get an internal averaging time for each pressure transducer.
Note that if the averaging time is defined to be long, the settling time
at power-up will be long, too.
The output reading is a running average pressure reading. The
measurement is updated in normal measurement mode approximately
every 1 to 4 seconds, depending on the AVRG setting.
A minimum of one-second averaging time is recommended per each
pressure transducer. One-second averaging time for a barometer with
one, two-second averaging time with two and three-second averaging
time with three transducers. These selections are used as the factory
setting averaging times.
Example of setting the averaging time to 60 seconds (WMO averaging
time for barometric pressure measurement):
>avrg <cr>
Averaging time:
1.0 ?<cr>
>avrg 60 <cr>
Averaging time:
60.0
>