DAQmx version to Labview 8.6 for a flowmeter calculations using 6008

[oort]

Hi!

I'm new with Labview.

I have intaled Labview 8.6 (evaluation edition) and i'm trying to do a program to aquire data from a NI 6008.

However at start i have instaled Ni-DAQmx 8.6 from CD but in Functions Panel it doesn't appear the DAQ Assistant Express VI.

Then i have daownload Ni-DAQmx 8.7 but when I try to install it doesn't appear the Labview 8.6 support.

Do I have to download Ni-DAQmx 8.9?

Then i need to do a program to aquire data from a Ni 6008 to determine the flowrate that passes over a flowmeter.

I'm reading the "getting started" from Labview and http://attila.sdsu.edu/me295/modules/labview/intro/introduce.html

However the flowrate vary the frequence response of the inductive flowmeter (http://arquimedes.net/sens/sensor_de_caudal.htm)

Do I will aquire the voltage or the frequency?

But to start I need to know how the hell do I get the Ni-DAQm support for Labview 8.6 (evaluation) to get the DAQ Assistant Express Vi as shown in getting started (page 4-2).

I have the MAX version 4.5.0f0 where I can see the NI 6008 board. 

Thanks,

Carlos

Message Edited by oort on 05-21-2009 09:29 AM

[mehdi.afif]

Hello.

You can download DAQmx 8.8 from NI website.

Regards.

[Coq_Rouge]

The flow rate is proportional with the frequency coming from your flow meter. You may use the onboard counter on the 6008 to find this frequency. You will find some ideas here http://zone.ni.com/devzone/cda/tut/p/id/7111

[oort]

But my signal is an analog voltage.

The PFI0 port on NI 6008 only counts digital signals, I think.

[Coq_Rouge]

---

oort wrote:

But my signal is an analog voltage.

The PFI0 port on NI 6008 only counts digital signals, I think.

---

I do not speak Spanish. But it look like your flow meter have a output equal to VCC-0.4. So if you apply 5 volt as VCC you should be able to use the counter.

[oort]

It's portuguese.

I think that the more important informations are:

Flowrate : 0,025 - 2,5 l/min
Voltage output: 0.1 to 3V (aprox. sinusoidal).

[Coq_Rouge]

Sorry my Portuguese is not strong either

from the data sheet on 6008 I can see that the minimum input high voltage is 2 volt. If your signal is fluctuating between 0.1 and 3 you should be able to use the counter. It does not matter if it sinus like because the digital logic only know two states, on or off  

[oort]

Well, using "Tone  Measurements" after DAQ I get a "frequency". 

I don't know if it gives the same value as if I used a counter but on monday I will try to do a calibration with this frequency.

With the valve almost closed I get 3-4 Hz and then start rising until 90Hz with the valve fully opened. 

I hope it give reasonable results. 🙂

Thanks.