Vaisala WXT520 Guide de l'utilisateur télécharger pdf (Page 112)

User’s Guide ______________________________________________________________________

110 _________________________________________________________________ M210906EN-C

[G] = Wind speed max/min calculation mode: 1 or 3

seconds

G =1: Traditional max/min calculation is performed

both for speed and direction.

G =3: Gust & lull are calculated for wind speed,

while direction calculation is as it is with G =1. In

the output messages, gust & lull replace the wind

speed max/min values (Sx, Sn), respectively.

For more detailed definitions of max/min and gust &

lull calculations see section Wind Measurement

Principle on page 25.

[U] = Speed unit: M = m/s, K = km/h, S = mph, N = knots

[D] = Direction offset: -180 ... 180°, see section Wind

Direction Offset on page 42.

[N] = NMEA wind formatter: T = XDR (transducer

syntax), W = MWV (wind speed and angle)

Defines whether the wind message is sent in XDR or

MWV format.

[F] = Sampling rate: 1, 2, or 4 Hz

Defines how frequently the wind is measured. Lower

sampling rate reduces the power consumption, but it

also weakens the measurement representativeness.

<cr><lf> = Response terminator

NOTE

When using MWV wind messages in NMEA 0183, one of the [R]

field's bits 1-6 must be 1.

NOTE

For representative wind values, use long enough averaging time in

relation to sampling rate (at least four samples per averaging time).

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Vaisala WXT520 Guide de l'utilisateur Page 112