Vaisala PTB220 User Manual download pdf (Page 32)

USER'S GUIDE_______________________________________________________________________

26 ___________________________________________________________________ M210194EN-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

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Vaisala PTB220 User Manual Page 32