How does the TRMC/TRP measure wind speed?

The TRMC and TRP have a pulse input that's connected to the anemometer.

The anemometer generates pulses as it rotates.

As described in doc_455 (Chapter 7), the TRMC counts these pulses in two different ways:

1. Channel 9 returns a relative pulse counter. It is reset to zero immediately after it has been read (i.e. immediately after acquisition). This counter is incremented with each pulse. This allows, for example, to measure the average speed.
2. Channel 10 returns the maximum number of pulses received in a second ("burst"). Each second, the TRMC counts the number of pulses it received in a second. If this number is greater than the previous maximum, it keeps it as the maximum. When acquiring on channel 10, the TRMC returns the value of this maximum and forces it to 0, thus restarting the process.

Then, when the values are transmitted to the TDS software, we will convert that number of pulses into velocity.

A rule of three is applied, taking into account the parameters of the anemometer, i.e. the number of pulses generated per m/s of wind.