VFD noise on other sensor output such as : Thermocouples, Accelerometer, Torque meter

Hi,
I'm using a PCIe-6351 Daq board (and SCB-68) for my test rig. I'm collecting different kinds of sensor outputs through this DAQ board such as temperatures, acceleration, and torque meter output.
beside that, I have connected a VFD (Baldor H2 inventor) using a USB cable to the PC case. I use this VFD to control motor speed. (http://www.baldor.com/products/accontrols/vs_inverter.asp)
Here is my problem:
when I turn on the VFD I get a lot of noise on every signal. This noise is like a peak which repeats every 5-6 seconds.
So it's not 50-60 HZ noise of outlets.
You can see related uploaded video clips on :
http://www.megaupload.com/?d=4NHDIVV7
http://www.megaupload.com/?d=2461Z7KN
I have uploaded some pictures too.
Is there any way that I can filter this noise in Labview? ( I have tried Filtration VI in labview, but couldn't find a correct setting)
How can I get rid of this noise?
I really appriciate your help on this matter.
Thanks.
-Jeff
Attachments:
Pics.zip ‏585 KB

I can very much identify with this issue. I have a test bench with two motors and corresponding Baldor H2 VFD's on it. I have a variety of sensors such as accelerometers, hall effect sensors, and a torque meter. The bench was put together "professionally" but still get this kind of noise.
The *only* sensor that I have this trouble with is the torquemeter. I get an impulsive EMI blast every 12 seconds on this signal with just one drive turned on. With the other drive turned on, the noise is excessive. I have spent weeks troubleshooting assumed ground-loop faults with the torque meter company's tech rep - to no avail.
I have confirmed that this EMI is from the drive. I hooked up a wire to the signal lead of an oscilloscope's VFD (acting as an antenna) and the noise I get on this oscilloscope is very similar to what I get on my torquemeter. (The noise is present only when the drive is powered up)
The noise from the VFD will not be cured by using a low pass filter. Impulsive type events have very broad band noise.
My new approach is to try and use adaptive noise cancellation to get rid of the the VFDs' EMI on the torquemeter. I gather the noise signal on my DAQ card (PCI-7851-R) by plugging just one wire into the positive port of an AI port and tying a 1 mega Ohm resistor from that port's ground to the AI port; this provides a means of collecting the EMI from the drive with an "antenna." The wire dangles by the side of the VFD with the other end taped up. See the following for a description of adaptive noise cancellation with labview (also possible on an NI FPGA device):
http://zone.ni.com/reference/en-XX/help/372357A-01/lvaftconcepts/aft_noise_cancel/
I believe this to be the only sound signal processing means of addressing this issue. I am still struggling to get it to work myself. I'll advice as I progress.
Cheers
Jordan McBain, PhD
LabVIEW Controls Engineer
Revolutionary Engineering

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