Noise USB 6211 problem

Hi, I use USB 6211 to measure pressures, but I got too much noise. Please see the attached figure. In order to test if it is the problem of the data acquisition card. I tried to record a 5 V DC from a power supply, and I had V - 2 noise without last coherent. Power supply has been confirmed without problem. I used the DIFF mode. Could someone help this out please? Thank you.

Tags: NI Hardware

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  • USB-6211 noise problem

    I use an NI USB-6211 device, Windows XP, and I have the problem of blood (photo attached).

    My analog differential signal (signal DC to DC power supply) is connected to an analog input in box usb-6211 (AI1 and AI9 ports).

    The signal I get is evolving between 0V the Volt of entry (in the attached photo - 4V) instead of 4 v DC.

    It might be a good idea to test it with a 9V battery using a differential connection with wiring configuration described in the manual (photo and link below). I know it sounds Basic, but re-seats black connector of i/o to the device might help. Make sure you reference GND AI as well.

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    Thank you!



    I'm glad that you have solved your problem.  Manuals for most of the DAQ cards NOR recommend resistance of two entries to HAVE to AI GND to ensure that a path suitable for polarization currents exist when it is used in differential mode.


  • OR corrupted USB-6211 is diff.

    Hello! I have a NI USB-6211 I want to use to measure a signal in differential mode. However there are problems to get the correct results. In the figure below, I have measured on a single 1.5 V AAA battery, with the device for the measurement of differential (and finished AI0 & AI8). As you can see, the signal is quite noisy, and also for each 20 ms signal drops to 0 V for a few milliseconds. The same behavior occurs for all channels!

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    If you check out the nickname compared to differential input Configurations, you can see that for floating signal sources, we actually recommend using Pseudo connections when you have a floating signal source, such as a battery. This means that you must connect a small resistance between I (-) (AI8, in your case) and GND. I try and see if it works.

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    Does anyone have ideas for me to try?

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    2 ensures that we use both the non-reversed or two signals reversed.  Do NOT mix or 'type' of the signal.

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  • The PCIe for USB 6211 OEM replacement

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    Thank you


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  • USB-6211 - digital output not supported?

    Hi all

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    I want to just turn on and off the lines from code...

    -Cs George-

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    -Cs George-

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    It seems that, after a thorough inspection, I am having some problems with a DAQ USB (USB-6211).  I try to read and to capture a series of samples to a fixed dt for a fixed rate (i.e. 50 ksps / s to 50 kHz for 1 s).  At every point I have retrieve the data (using the vi DAQmx Read), I add the (recovered as a waveform) data to all previously retrieved data (using the vi Append waveform).  After that I captured my 50 kS, I then ship the data off the coast in a queue for processing in the frequency domain using one of the FFT routines. Pretty easy, right?   However, according to what is happening on the desktop, it seems that the data acquisition time can vary at least +/-20 we tell me that some of the sampled data may have been deleted (if only a few samples) and is irregularly spaced out in time.  It is a problem like falling none of the data is likely to skew the results in the frequency domain.

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    Thanks for the timely response, kikiduu and I apologize for the delay in responding.  It turns out that I've implemented my evil FFT and it was question thereal I deal with.  Briefly, I was generating a tophat in the shape of signal in the frequency domain, and then using the IDFT to convert the singal to a time field that could be sent to the DAC.  When I got the signal that I had generated, depended on the result of the where the AO signal was sampled.  The simple answer to why it happened was with the windowing feature that I used.

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    Cheers, Matt

  • Data acquisition high speed (200 ksps / s) with pci-6224 or usb-6211 is possible?


    I need assistance to complete a task.

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    Thank you in advance,


    The number of iterations has nothing to do with the number of samples if you do it right. You specify the rate and the number of samples you want and number of samples returned. You DO NOT loop 200,000 times. If you ask for 200 000 s/s and 200,000 samples, you will get this number of samples every second. It's really as simple as that.

  • The conclusion for M - Audio MobilePre USB driver problem

    The conclusion for M - Audio MobilePre USB driver problem

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  • USB-6211

    Hi, recently, I ordered the DAQ USB 6211, I wonder how do I connect a quadrature encoder to the DAQ meter, I would like to only use a single meter, pin 1-4, my encoder has two channels only, CH A and CH B.

    Best regards;

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  • OR USB-6211 is used to count climbing on board TTL


    I'm new to NOR-DAQ cards, and so before buying whatever it is would like to know if it is possible to use a device, NI USB-6211

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    What I want to do is to count how many rising edges of a TTL signal I get in a period of 1 ms; a 20 Mhz sampling frequency should be fine.

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    Is it maybe possible to leave the external TTL signal trigger a 6211 counters, an output then periodically (1 ms) and reset the value of the counter?

    Is it possible and if yes, is it a good idea?

    Thanks and regards,


    Manual Hi

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    Maybe you can use what is called "panel test" inside the Explorer Measurment & Automation to generate signal. The Measurment & Automation Explorer is a tool provided with the driver for the DAQ cards. The original purpose of this software utility is to configure your hardware, test and so on.

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    Not very nice, but maybe the only solution.

    Best regards, Stephan

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