Effects of temperature, barometric pressure, rainfall and humidity

The calculated u,v and w components are independent of temperature ,pressure,rainfall & humidity within the operating

parameters of the WindMaster.

The calculated sonic temperature/speed of sound should be corrected by the user for humidity to provide and indication

of ambient temperature.

Measurement sequence

The table shows the firing sequence of the transducers.

Measurement Sequence

The sample rate is automatically selected to either 32 or 40 Hz, depending on the output rate configured

Measurement Period 10 ms max Next cycle

Ultrasonic Measurement Axis 1 2 3 1 2

Transducer Firing L > U U > L L > U U > L L > U U > L L > U U > L L > etc

Analogue Input Measurement 1, 2, 3 or 4, PRT (one in four)

Serial Communications Data from previous meas.

L > U Indicates lower to upper transducer firing

U > L Indicates upper to lower transducer firing

Analogue inputs 1 & 2 are sampled every measurement period

Analogue inputs 3 & 4 are sampled alternatively ( ie half of measurement rate

PRT is sampled once every 4 firings (ie quarter of measurement rate)

Signal processing

Instantaneous Sampling

The WindMaster can be configured to output the sampled data direct at the selected output rate without any averaging -

"Instantaneous Sampling". Alternatively data can be sampled at 32 or 40 Hz and averaged (see section 10.2 PX). This

applies for wind data and speed of sound. All samples are transmitted with a status code.

Retries Enabled

If this mode is selected, if a problem sample is detected, the unit will attempt another ultrasonic firing within the set

time parameters.

Calibration Enabled /Disabled

The on-board calibration (providing compensation for spar and transducer shadowing), can be disabled, returning the

unit to raw, uncorrected operation. 

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