Weather Station Hardware > Ambient Weather and Ecowitt and other Fine Offset clones

Ecowitt WN90LP wind speed updates

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Rocketman:
Could someone explain the below ( from specifications of WN90LP )
Wind speed Metering Interval - 2S
So does mean it gets updated every two seconds
and is it any faster than Davis weather stations which i think are 2.5s
Does that mean Ecowitt WN90LP is the fastest sensor ?

Gyvate:
it is the sampling interval (2 seconds), not the transmission interval which is 8.8 seconds.

You keep on asking questions which are all already answered in the WiKi - the above one in
https://meshka.eu/Ecowitt/dokuwiki/doku.php?id=start#ecowitt_outdoor_sensor_arrays

Rocketman:
Please check - your Wiki is not up to-date
Where is the information on the WN90LP ?

wind measurements by the different outdoor array anemometers
(Ambient names see above)

there are five important terms in the context of wind readings/measurements for Ecowitt anemometers
1. sampling rate (how often a measurement is made inside the sampling interval, as for Ecowitt 1 Hz = one per second)
2. sampling interval (time in which the sampling takes place before a result is transmitted)
3. transmission interval (as a rule the same as sampling interval for current wind speed and direction - between 2 and 48 seconds)
4. definition of gust (highest wind speed within the past 28 seconds)
5. transmission value (the last value in the sampling interval = transmitted wind speed, gust and direction)
6. (for ultrasonic anemometers) at wind speeds lower than 5m/s, the dispersion of wind direction will increase


WN67: sampling interval 16 seconds, sampling rate: 1 Hz, gust: highest wind value of the past 16 samplings
WS65/WS69: sampling interval 16 seconds, sampling rate: 1 Hz, gust: highest wind value of the past 16 samplings
WS68: sampling interval 16 seconds, sampling rate: 1 Hz, gust: highest wind value of the past 16 samplings
WS80: sampling interval 4.75 seconds, sampling rate: variable, gust: highest wind value in the past 28 seconds
details:
when max wind speed in the past 4 seconds is >= 5 m/s, the sampling rate is 1 Hz
when max wind speed in the past 4 seconds is >=3 m/s and < 5 m/s, the sampling rate is 2 Hz
when max wind speed in the past 4 seconds is < 3 m/s, the sampling rate is 4 Hz
WS90: sampling interval 8.8 seconds, sampling rate: 2 Hz, gust: highest wind value in the past 28 seconds

WS85: the sampling interval is 8.5 seconds, sampling rate: 2 Hz; gust: highest wind value in the past 28 seconds

WN90LP specifications - Can you add to your Wiki ?
HY-Display Console updates every second and it looks the sensor updates every 2 seconds (historical data is being recorded onto SD card )

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Gyvate:
whatever ...
a WS90 and a WN90LP have the same anemometer and the same sampling rate and the same data reporting interval
apart from an extra pressure sensor, a missing solar panel  and a different transmission type, they are identical and also use the same firmware

at the WN90LP entry this is all described - so what's missing ?

your console doesn't update every second, it only queries every second. So for 8 seconds it will receive the same reply as the data reporting interval is 8.8 seconds. At the earliest after 9 seconds it can receive an update. The queries in between produce only pseudo-updates.
And what "history logging" are you talking about ?
Do you want to invent a new name for the data sampling process ?
Otherwise no history data is stored in the WS90/WN90LP

mcrossley:
But aiui the WN90LP does not have a "transmission" interval it waits for something external to query it. It may sample at 2 secs, so if you query it every 2 secs does it send the latest sample? Should be easy for @Rocketman to prove one way or the other if the data he sees does change every 2 seconds.

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