Como construyo un sistema de adquisicion de vibraciones con pocket pc

[Battousai]

Hola, necesito construir un sistema de adquisicion de vibraciones con una poocket PC. HAbia pensado partir utilizando la 6036E como tarjeta de aduqisicion, pero a esta hay que agregarle un acondiconador de señales principalmente para filtrar de forma analoga las señales (aliasing). Esto no lo tewngo muy clrao, a lo mejor existenten otras configuraciones.

Agradezco desde ya su ayuda.

Muchas gracias

[preston_johnson]

Good Day,

There is a device from the Modal Shop which works with the DAQcard which you have. This device provides IEPE, AC coupling, and so forth for accelerometers. It is a new product and is not yet on their web site. You will need to contact www.modalshop.com and ask for Mark Schaefer to learn more about it.

An alternative is to use batter powered IEPE conditioners such as those from Endevco, or PCB. You can create a specific cable for your DAQcard to reduce the cabling.

LabVIEW PDA software supports DAQmx Base, and LabVIEW FFT functions and displays. Our applications engineers at National Instruments can help you configure your programming for your specific measurement, analysis, data storage, and display requirements.

I hope this helps get you started.

Sincerely,

Preston Johnson
Business Development Manager, Industrial Applications.

[Battousai]

Thanks a lot.

I have tried to contact with modalshop, but they have not responded my questions to me. This is a copy about the email that i send to them:

"I tell you the problem. We want to create from one pocket PC, a recolector of vibrations,for that we must incorporate to him to a this one card of acquisition, for which we chose 6036E. But, because we are going to collect vibratory signals we needed to give energy to the accelerometers, and in addition to tachometer that we are going to him to add (it seemed very good to us when we knew
that the product consists of 2 channels and one entrance of tachometer). For that we had thought about a conditioning one of signals, that it allowed us what we needed, nevertheless we did not find one that us we liked, due to the size, rigidity, etc.
It is of that very we are interested in this product which they are going to remove to the market, since it would solve the problem to us.
But we are in the study stage, and for that we needed to know some things to make some decision more:
* Engineering specifications, the size and versatility.
* What filters use and how (since it is very important to eliminate aliasing of the signals). We understand that there would be to filter the signal analogous at first soon to make the conversion analogous-digitalis a nd fiter digitally to obtain the cut-off frequency that is required (theorem of Nyquist). It would be good for knowing in addition that so rigid they are these filters.
* If this instrument us rigidiza the acquisition of the signal, in the sense that it will impose a maximum frequency or intervals to us of frequency to which to sampling, or if imposes a certain number to us of points/lines (like the present analyzers commercial that are of 400-800-3200lineas). The idea of us is to obtain the possible most flexible recolector, to which by means of programs in LabVIEW the parameters of sampling and restrictions are defined.

From already thank you very much."

If somebody can explain this and send me somesthing information about this products, i very will be thanked for.


Luis Amigo
SPM Ingenieros Ltda.