Use of a non-NI DAQ with Labview

[Agnivesh_Kumar]

Sir as i told you that my other part of project is to make the spectral analysis of the acqired data.

So for understanding that i made a example vi that have 4 frequencies and deffernt amplitudes now after this itake the fft of that signal so i got as usual 4 peaks in my spectrum now my question is that if i want to compair the one component to other and make the decision so how can i do this ?

Iam sending you my example vi .

Please tell me how to do this

Thank you

[Esteban_B]

Hi Agnivesh,

I’m not sure of what is what you want to do, but I believe that what you need to do is to get the output signal, get the maximum values (there is a Max & Min array function for this) and do some math to compare the data.

Regards,

[Agnivesh_Kumar]

Yes Sir ,

Actually i am going to tell you what i exactly want to do.

Sir I am doing project in GAS TURBINE ENGINE Compressor , Now i want to acquire the blade vibration using sensor. So when i acquire and doing  the FFT of this signal then i got many frequency components upto 20KHz. and there is rotor frequency is also comes , this rotor frequency is my fundamental frequency now my task  is to compair the frequency components just left and right to the fundamental frequency. and make some derision. and it is continuous process every time it will check and give some indication.

Sir this is what i want to do .and i am facing the problem that when i record the fft signal it is in array form and next is that it is continuously changing. So i can only see the components in waveform but cant make the derision so please tell me how to do this in labview. 

Thank you 

[Agnivesh_Kumar]

Hello Sir, 

I need help from you .

Sir i am sending you my VI and some images related to my problem.

Actuly sir when i giving a Amplitude modulated Signal to my vi and take the fft power spectrum  of that signal then i got the peaks like one is carrier frequency peak and other are lower and uper sidebands .Now i saw tha power spectral information there are  magnitude is also present but this magnitude is ("magnitude of avearage Power Spectrum).

Sir i want to take the magnitude of peaks (every peaks ) at every frequency , means i want to make the table , which shows like

                                                              Frequency                                          Magnitude

                                                                   10Hz                                                Magnitude ?

                                                                   20 Hz                                               Magnitude?

                                                                  ....................................................

So on .

Sir how can i do this please do any modification in my Vi , i need urgently

Thanking You

Agnivesh Kumar 

[alishaolin]

Hi Dear friends

Im using a non NI USB  DAQ  for my biomedical Project but unfortunatly i can not use the DAQ assistant in labview to get an input signal always replying by no supported device found .

is there any solution to this??

Thank you in Advance

[Agnivesh_Kumar]

First of all you have to install device driver for this DAQ card which is avialable with DAQ card and if not so you can download from website.

I hove it will work.