[C320-list] Raytheon ST60 wind anemometer not reading

[Graeme Clark]

Does the wind direction work? I’m sure you realise this but the way you wrote your post does leave some doubt so I’ll ask anyway! The rotating cups are what drive the speed, the wind vane reads the direction

The speed is derived from a small magnet on the rotating shaft that creates an electrical pulse every time it rotates (or possibly two pulses if there are two sensors)

There is a method (which may take me a day or two to find!) of simulating that at the back of the instrument by (I think, but need to check so don’t risk it yet unless someone else can confirm) shorting the speed wire (blue?) to ground repeatedly and rapidly to create a pulse
But it might be by applying 12v repeatedly! Sorry I can’t be more specific right now

But at least you’d know if it was the instrument itself at fault

Most likely culprit is probably a bad connection somewhere though, unless anemometer cups are seized of course!

The speed and direction (3 wires) share a common earth so if the direction is working it’s probably not an earth wire fault

Graeme
#366, 1996 “Jaskar”

Sent from my iPhone

> On 23 Jun 2019, at 04:04, Leonard Hooks <lehooks at gmail.com> wrote:
> 
> My wind anemometer has stopped reading and is only showing 00.0.
> It is a Raytheon ST60 which was working fine.  All other instruments working fine.
> The vane at the top of the mast is turning normal, just not displaying any speed.  The display is still working and the repeater inside shows the same result.
> 
> Where can I start to check?
> 
> Leonard Hooks
> Revelation 2001 #856
> sdg