Vibrations Measurement

[Gada]

Hello everyone, I have a question, I am measuring vibrations with the 9230 card and the chassis 9174, and a frequency of 20 Hz appears and I can not understand where it could be, everything is working with batteries, so it is eliminated the influence of the network, I don't know if someone could help me explain why those 20Hz, when doing the FFT to the noise signal.

I thank you in advance, good day

[RavensFan]

If you attached some images of the raw waveform and of your FFT, you might be able to get some some help.

If you are able to attach a data file that contains a section of the raw waveform so people can load it and inspect it.  Even attach your VI.

It is hard to debug a signal problem when all you have provided are a few sentences.  What sensor are you using to measure the vibration?  What physical thing is the sensor trying to measure?

[cy...]

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@Gada wrote:

 everything is working with batteries, so it is eliminated the influence of the network,

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can anyone explain this?

[JCooper509]

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@cy... wrote:

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@Gada wrote:

 everything is working with batteries, so it is eliminated the influence of the network,

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can anyone explain this?

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The power network, presumably

[Henrik_Volkers]

I have a ~24Hz  signal in my office-seismometer 😄

But I know the origine: we have a bad air condition unit with a bad fan on the roof 🙂

Type of sensor and cable length?

How and where mounted?

and a snipped of the DAQ wfrm read would be helpful.

[Gada]

The sensor used is acelerometer ICP IMI model 603C01, first I'want measured the acceleration, but the aplications that I need is the velocity.

I probed the acceleration, to view the frecuency analisis.

In the process, I need to integrate the signal ... in the next step.

[Gada]

yes, the power network