Hi all, am new to Instrumentation and the world of Datatakers so please be gentle with me!

I have been trying to find a way of logging the o/p of an anemometer with a DT80, it produces an frequency o/p between 4.9 -34Hz (equivalent to 3.9-26m/s) which sits on a variable o/p voltage of a couple of hundred mV.
I am struggling to find a way of setting the DT80 up to give me a m/s output, have it connected to Ch2 + - and have got to the point of deleting all schedules etc that I have tried, so looking for a clean start and some guidance.

Best regards
RZ

HI Rz,

No worries, I will gladly answer any questions about dataTaker.

You may use analog channel or digital channel to measure frequency:

• Analog channel (connected to Ch2 + and -): 2F
  For frequency measurement the voltage level need to cross 0V to produce a reading.
  I.e.: Vpp between -1V to 1V

• Digital channel - high speed counter (connected to 1C and D Gnd): 1HSC(R,RS)
  R means the reading will be reset after each report
  RS means reading per time difference (count/ second = frequency)

Then apply a scaling, scaling is used to convert fro Hz to m/s
Example:
if your signal is 4.9 - 34 Hz and you want to convert it into 3.9 - 26 m/s, then you can write as follow:
S1=3.9,26,4.9,34
To apply this scaling, you can use it as channel factor
2F(S1)
1HSC(R,RS,S1)

So the complete program will be:
BEGIN
S1=3.9,26,4.9,34
RA1M LOGONA
2F(S1)
END

You may add channel name and measurement unit as channel options 2F("Wind speed~m/s",S1).

Best regards,
Rudy Gunawan

Thanks for the help Rudy, that is the way I had set up the channel, I now believe the issue is with the anemometer and not the schedule, it would appear there are a couple of offsets and something called 'uncertainty percentages' to be added in.

TBH the signal is so poor coming out trying to get this all to work would not be time well spent.

Appreciate your input though, thanks

Hi Rz,

No problem at all.
What is the brand and model of anemometer?
Is there any user manual that I can access online?

I might be able to offer you some suggestion to read that sensor.

Best regards,
Rudy Gunawan