HS-50 & HS-100
Doc. No 1199-PS-0035 Issue 3
June 2021
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Page 13
8 OPERATION
8.1 Overview
Data output rates up to 100Hz (model dependant).
Measurement of wind velocities to 45ms.
Wind speed accuracy < 1% RMS.
Configuration carried out via serial port and stored in non-volatile memory.
High speed, full duplex RS422 interface, operating up to 115200 baud.
Background diagnostics providing the user with the confidence that the unit is operating
correctly.
Optional Sensor Input Unit provides six differential 14 bit analogue inputs and one PRT100
input.
Optional Power & Communications Interface with 4 Analogue outputs representing wind speed
and Speed of Sound or Sonic Temperature.
8.2 Operating modes
The anemometer has two operating modes:
1.
Measurement mode - This is the normal mode of operation, which is the default mode from
power up.
2.
Interactive mode - This allows the anemometer to be configured and interrogated.
8.3 Measurement Mode
The principle of operation is described in Section 5 (page 5). The parameters sampled are
determined by the anemometer’s configuration and consist of:
1.
Wind velocity (axis velocities are always sampled)
2.
Speed of Sound (SoS)
3.
Analogue Inputs (6)
4.
Absolute Temperature (PRT100)
The way in which the results are calculated, formatted and reported depends upon the configuration
of the anemometer.
8.4 Sampling
Wind velocity, SoS and analogue inputs are sampled every 10ms, in a fixed sequential pattern. The
PRT100 is sampled every 40ms. The measurement sequence is shown in Drawing Number 1210-
K-068 on page 42.
8.5 Averaging
These samples are block averaged before being converted into results. For wind speed, SoS and
analogue inputs the number of samples used in the block average can be set to between 1 and 250
(HS-100) or 2 and 250 samples (HS-50).
E.g. Default Average Sett ing is 5 therefore Output Rate = 100/5 = 20Hz.
The corresponding m axim um num ber of PRT100 sam ples per result is 62.
Summary of Contents for 1199-PK-085
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