eliminating ripples

[InasLab]

Hi everybody.

I am trying to get rid of as many riplles as possible from my measurents but i am stuck. I dont know which filter could be ideal for this matter. I have done everything possible in terms of hardware to eliminate the noise but i still have some noise in the system which i would like to reduce using Labview.

Please have a look in my vi and suggest me what filter could I be using to smooth my signal.

Thanks

[InasLab]

by the way, I am using cDAQ9172 and measurement modules are 9203.

Here's a picture of my noise signal (the first two signal are measuring zero, but the noise is the same when i measure non-zero values)

Regards

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InasLab wrote:

Hi everybody.

I am trying to get rid of as many riplles as possible from my measurents but i am stuck. I dont know which filter could be ideal for this matter. I have done everything possible in terms of hardware to eliminate the noise but i still have some noise in the system which i would like to reduce using Labview.

Please have a look in my vi and suggest me what filter could I be using to smooth my signal.

Thanks

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[Henrik_Volkers]

The hammer for that nail (noise) is averaging.(Lowpass filter).

However some important informations are needed:

Samplerate and how fast is the system? 

How fast you need a value? Phase margin?

Even more can be done with fitting, if the type of signal is known. 

[InasLab]

Thanks for your answer.

I am running my system at rate=6000 and reading 1000 samples/sec.

I have tried to put a low pass filter but hasn't solved the problem.

Thanks

[Henrik_Volkers]

What is the bandwith (highest expected (meaningfull) frequence) of your signal?