Hi,

I was trying to connect a cup anemometer NRG#200 to the DT80. But could not succeed. It has 3 outlets: power, signal and ground.

I used the DT80 as a power supply to the NRG#200, I used the green outlet on the side of the datataker (it was around 20V) (the NRG#200 operates from 5V to 24V).

I connected the +ve terminal from the green outlet to the supply of the cup, -ve terminal to the ground of the cup then to the digital ground. And the signal of the cup to 1C. The cup had a non linear equation of m/s= Hz x 0.765 + 0.35, so I put in a polynomial span of y1= 0.35, 0.765"m/s".

I used the both the HSC and C channel option but could not get any counts in the reading meaning on reasonable wind speed. What did I do wrong?

As per the manual I used a 1K Ohm resistance between the signal and supply. the output signal of the cup anenometer is from 0 to 125 Hz. Sample program:

'JOB=JOB1 
'COMPILED=2009/01/13 09:52:53 
'TYPE=dt80 
DT=\d 
BEGIN"JOB1" 
CATTN 
'Spans and polynomial declarations 
Y1=0.35,0.765"m/s" 'Thermistor declarations 
'Switches declarations 
'Parameter declarations 
'Global declarations 
RS1S 
'schedule definition 
RA("B:",ALARMS:OV:100KB,DATA:OV:1MB)5S LOGONA GA 
1C(Y1) 
END 
'end of program file

avishekmalla

Good afternoon Avishek,

Use the HSC channel type. The C is for when you use the digital inputs as a counter.

Cheers,
Roger

Hi Roger,

I did use the HSC channel as well but it gave me weird outputs like in the range of 200 m/s and more.

'JOB=JOB1
'COMPILED=2009/01/13 14:58:18
'TYPE=dt80
DT=\d
BEGIN"JOB1"
CATTN
'Spans and polynomial declarations
Y1=0.35,0.765"m/s"
'Thermistor declarations
'Switches declarations
'Parameter declarations
'Global declarations
RS1S
'schedule definition
RA("B:",ALARMS:OV:100KB,DATA:OV:1MB)5S LOGONA GA
1HSC(Y1)
END
'end of program file

avishekmalla

Hi Roger,

I used a external power supply and it worked. What are the functions of wrap and counter preset?

avishekmalla

Good afternoon Avishek,

Glad to see it's working. You won't need to worry about wrap and preset.

Wrap is to set when the counter goes back to zero. e.g Count from 0 to 10 then start at zero again. Preset is to start counting from this number. E.g Count fro 0 to 10 but start at 5.

Cheers,
Roger