Measuring Low Frequencies with LabVIEW and FieldPoint Using [c]FP-CTR-500/502

[mvitor]

I am trying to use this example in a LabView 8.0 and a Field Point FP-CTR-502 module but without any sensor I get frequency and period values.

Is that possible to use this example with LabView 8.0 or not?

I am trying to use an anemometer Campbel Scientific A100R.

http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3ED7556A4E034080020E74861&p_node=174404&p_source=External

[ManuelR]

 What frequency do you obtain? it could be a noise.

If you connect a referenced signal, do you have these values?

Message Edité par ManuelR le 07-06-2006 04:49 AM

[mvitor]

No... that is not noise. Even when I shortcut direct in the FP terminals I get random values in the frequency. I made the configuration for FP several times to confirm if there were something wrong but nothing works

[selmore]

Sounds like it could be a floating common/ground loop problem. Are all you negatives connected to the same ground point (including the power supply common)?

Steve

[mvitor]

I am sure this is not an electrical problem. Even in the laboratory the displayed data are wrong. We had this anemometer pluged in a weather station an its is working well. Did you tested this program too?

[ManuelR]

Did you tried with Measurement and Automation Explorer?

How do you connect the anemometer to your FP? differential mode? RSE? NRSE?

[mvitor]

I realy dont know... what does it means... is supposed to know all this to connect a simple anemometer?

The anemometer acts like a little switch, switching on and off for each revolution.

[ManuelR]

You can launch MAX from start\programs\National Instruments\Measurement & automation.

Concerning source signal wiring, you can have a look to the following link : https://www.ni.com/en/shop/data-acquisition/measurement-fundamentals/field-wiring-and-noise-consider...

Hope this helps,

[ManuelR]

Hello,

Is your problem solved?

Do you need more help?

[mvitor]

No, my problem is not solved yet...