Vaisala MAWS201 User's Guide Page 192

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User's Guide _______________________________________________________________________
190 __________________________________________________________________ M210243en-A
Accuracy
The degree of conformity of a measured or calculated value to its
actual or specified value.
Altitude
The station altitude in meters from sea level.
Atmospheric
pressure
The pressure at a given point due to the gravitational force on the
column of air above it. The official unit of pressure is Pascal
(Pa = newton/m
2
). The unit hectopascal (hPa) has been chosen to be
used in meteorological barometric pressure measurement.
1 hPa = 100 Pa = 1 mbar
Barometer
Instrument for measuring atmospheric pressure.
Barometric
pressure
See Atmospheric pressure.
Baud
The unit of signaling speed of a line, which is the number of
transitions (voltage or frequency changes) that are made per second.
The term has often been erroneously used to specify bits per second.
However, only at very low speeds is baud equal to bps; for example,
300 baud is the same as 300 bps. Beyond that, one baud can be made
to represent more than one bit. For example, a V.22bis modem
generates 1200 bps at 600 baud.
Celsius scale
Temperature scale having the freezing point of pure water at 0 °C
and the boiling point at 100 °C under standard sea level pressure. All
the temperatures measured with MAWS are given in Celsius
degrees.
Configuration
Set of instructions for the MAWS logger. The compiled
configuration (a script) is in fact a program that runs in MAWS.
Crosswind
The wind blowing perpendicular to the course of a moving object.
Damping ratio
Describes the response of a wind vane to a sudden change in wind
direction. It is defined as the ratio of the actual damping to the
critical damping. Critical damping is that value of damping which
gives the fastest transient response without overshoot.
Delay distance
The passage of air necessary over a wind vane to cause the vane to
respond to 50 % of a step function change in wind direction.
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