Does Strain task in DAQmx include lowpass filter?

[CW_Edge]

I am using a load cell with a 2.232 mv/V with an excitation voltage of 10V.  When I put a scope to the output, there is a lot of high frequency noise which causes me to have to use an amplifier with a lowpass filter built in.

I would like to be able to accomplish this same task without having to purchase the amplifier (I have 3 load cells per machine, 6 machines so cost does add up).  I am currently using a PCIe-6320 for some encoder measurements on this same application and did find where I can use the analog inputs to measure Strain using DAQmx.

My question is does the Strain measurement in DAQmx have a built in lowpass filter to clean up the signal?  If not, is there a solution to this that does not require a Toolkit or additional module for signal processing?  We have the basic LabView 2009 SP1.

[aeastet]

If you pull them into LabVIEW you can easily add any kind of filter that you want. There are many different types of filters that are included with LabVIEW at no cost look at the panel under signal processing.

I would also look at why you are getting so much noise. How do you have your channels hooked up to the system?

[Ben]

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@aeastet wrote:

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I would also look at why you are getting so much noise. How do you have your channels hooked up to the system?

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Yes.

Using a strain guage module the bridge is built into the terminal block and the hardware does the mv/V thing so there must be some place the noise is entering the system, long, non-shielded, non-twisted pairs, bad ground...

Ben

[CW_Edge]

Here is what I have for Signal Processing.  Are there more VI libraries that did not install?  I just assumed there were additional modules for purchase that we do not have.

[aeastet]

What version of LabVIEW do yui have? year and model (i.e basic, full, professional, Desiger)

[CW_Edge]

LabView Base Developement System.

Version 8.5.1 on my desktop machine, but have 2009 SP1 on computer with PCIe-6320 that will be running the measurement program. 

Screenshot above is from 8.5.1 machine, however, 2009 version has same options.

[aeastet]

You will need at leat the full development system to have these functions. You could look in the LAVA forum or OpenG to see if someone has a free version.

I would still try to understant why you have so much noise. I do strain all of the time and I do not see this noise. I use an SCXI system with two strain gage modules.

[Trondheim]

All,

Is the DAQmx more sensitive to noise than the former DAQ system?

Thanks,

dlw

[Timothy_S]

Trondeim,

For your information, please create a new thread post to ask new questions in the future to keep the questions and forums organized. Thanks.

DAQmx is a hardware driver set and shouldn't have any affect on noise sensitivity as compared to previous drivers sets (Traditional DAQ).

Those drivers are controlling the PC--DAQ device connection/operation and shouldn't change the device or signal characteristics themselves.

Timothy