Noise with Kulite Pressure Sensor on NI USB-6255

[Dan_K]

Hello Jerrod,

In terms of the Kemo filters it sounds like this is noise being introduced by the filters themselves, as long as you have properly shielded cabling taking the readings from the filters themselves. Based on everything you have told me, and without being there to see it myself, environmental noise is probably not the issue. As far as the power supply goes, you could try using a higher quality power supply, but if the problem is in one of the other components further down the line this would most likely change nothing.

Let me know if you have any updates on your project.

[HickoryDAQeryDoc]

Dan - 

Thanks for checking in.

I am in contact with Kemo --- we've arrived at the same conclusion. We're trying to supplement the built-in grounding on the units, and I'm beginning to look for a substitute unit.

- J 

[Dan_K]

Hello Jerrod,

That sounds good, let me know what you find out. If you have any other problems or need any help feel free to use these forums in the future.

[tzw23]

I am working around a similar noise problem.  Were you able to get this working?

[Bill Wang]

I'm working on noise issure too. It's terrible. I can't work it out.......

[HickoryDAQeryDoc]

I eventually did have a *lot* of luck improving things.

It had a lot to do with improving the quality of my lead wire extensions (shielded twisted pair), and ensuring a common ground- and shield-potential throughout the entire system, including the signal conditioners and DAQ. I used the Kulite's black wire: "excitation -". This was most of my improvement in noise.

In addition, I also built my own signal conditioner (and excitation supply) using ultra-low-noise integrated circuits from TI.

[Bill Wang]

Sorry to bother you again. Jerrodh.

Could you please let me know what you did for your own signal conditioner? Add what does the common ground mean? Should I connect AI GND to building ground always? I would really appreciate if you could give me any more sugguestions on this. I'm still have too much noise, like 30 mV.

Did you do something to low your impedance?

Thanks very very much!!!

[rding]

Hi, everyone,

Looks like a lot of people are sufferring.

What I'm facing with is also pretty odd. I could acquire data from one Kulite pressure transducer (XTL-140, 4 wire connection, powered by a 10VDC), but if I use the same power source to power two Kulite transducers (XTL-140 & XTEL-190, connected in parallel), I could get nothing.

Is there anyone ever had the similar problem before?

Thanks,

RD