USB-6211 noise problem

Similar Questions

• Pressure transducer USB-6211 noise error

  Hi all

  I tried to connect a pressure sensor through my data acquisition by the voltage reading and when you use a multimeter to check the voltage measured by the son, I get exactly what I want, but when I look at reading through labview, I make so much noise that I can not even acquire a strong enough reading for the tests. When to play with filters and blocks measure, I'm sure that some of the ways to reduce the noise and get the reading of the amplitude of crete would, just do not know where to go next, as I have tried so many options like this already.

  Problem has been resolved. Simply a problem of ground that I threw.

• 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.

  
  

• NEITHER USB-6211 signal to noise

  While using the analog inputs of the device USB-6211 (Labview 8.5 / Win 7) signal become noisier. By surprise, I got a signal perfect after you have disconnected and reconnected the USB card to the system. This behavior is reproducible for the cards (n = 4) that we use in our laboratory. Is this a known issue with the 6211 card and if so is there a method to reset the map using labview?

  Thank you!

  Christian

  Christian,

  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.

  Lynn

• With differential measurement noise problems

  Hey everybody.

  I use an NI USB-6211, LABView 2011 and Win7.

  I'm trying to measure a voltage through a resistor using differential mode. But unfortunately im getting a lot of noise (on + - 25%).

  The voltage source I use is variable and can go up to 600V. With my diet I am essentially heat a metal plate.

  A parallel voltage divider is used to reduce the voltage by one hundredth (1 MOhm and 10 kOhm).

  Two wires attached to the lower resistance then go directly into analog input 0 + 8 of data acquisition.

  So if I'm trained 600V to the plate, data acquisition should get about 6V... and that's what I measure with my voltmeter attached to the acquisition of data input pins.

  I also tried these resistances of POLARIZATION and connected the + and - leads to the analogous to the ground like a resistance I used 10 k, 100 k and 1 MOhm and 2 MOhm and

  continue to receive a bad signal.

  Two sketches of the wire as a signal (100V, supposed to measure 1V, no CORRECTION) are attached to the post.

  Concerning

  EDIT: I forgot to write that I even tried an another NI DAQ and still get this noise problem.

  Also, I measured the voltage source signal using an oscilloscope and I see that noise. But the differential mode isn't supposed to

  reduce noise to a minimum?

  Hey everybody,

  come to understand that the voltage divider resistors are medium to high and they were the main reason for the noise

  problem.

  Before I used 1 MOhm and 10 kOhm, now I use 100 ohm and 100 kOhm and with a median filter in this regard, it works very well!

  But still, if I use the resistance of these BIASES they do not change.

  Concerning

• 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!

  

  If you are using CSR (connected to AI0 & AI GND or AI8 & AI GND), data acquisition shows as expected without noise, as shown below.

  

  How am I wrong, or have data acquisition failed?

  Hello Andres,

  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.

• Lack of charges, USB-6211 with linear gauge Mitutoyo (542 series)

  I use a USB-6211 box with a race of 10mm Mitutoyo Linear Gage (542 series, model LGA-110). The Mitutoyo has output similar to an encoder without the time by rev signal quadrature. (B has a phase shift of 90 degrees of A). Signals A and B are airline pilots. I have a k 2 5V to A resistance and another 2K to 5V to B, gives me a minimum of 0.05v and a maximum of 4.75V.

  The problem I encounter is that I seem to be missing certain counts that I can't always zero.

  I found that if I caress the complete range of meter and the return to zero in 20 seconds, I get a value close to 180 meter microphone. If I press the complete range of meter and the return to zero quickly in a second, I get a value close to 800 micrometer.

  If I caress the quick pledge on the compression and rebound more slowly, I find myself with a positive value. I caress the slow pledge on compression and quick on the rebound, I find myself with a negative value.

  As I said before, it seems miss me certain counts. With a pulse of each mic of 4 meters, it means I get only 2500 pulses per 10mm. This means that 10mm per second is only 2500 pulses per second. It seems slow for me, so I don't know what would be the problem.

  Does anyone have ideas for me to try?

  With this type of signal you should not missing any counts.  The time base on the box USB-6211 is 80 Mhz and therefore should have no problem to solve your two pulses per train.  I have a couple of steps that I would like you to try troubleshooting.

  1 to ensure that we plugged the inputs correctly to our DAQ hardware.

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

  3 allows you to wire signals A and B in two inputs analog and we will try to read signals to ensure that the sensor is actually be set correctly by the sensor.  Be sure to taste pretty quickly--> 10 the frequency of the pulse train.  If you race through 10 mm in 1 sec--> 2500 pulses per second--> 25 kHz sampling rate.   Allows to check two things.  First we have a good TTL signals, and that we get the right number of charges.  If you reply to this thread plaese attach a screenshot of the present.

  4. we will try different encoder types x 1, x 2, x 4 in the DAQ assistant.  The x 2 and x 4 encoder allows the best sensitivity for small movements (which I'm not sure that it is the source of your proplem but it will be a good thing to check).  Types of encoder are discussed in more detail in the following developer area: quadrature encoder measures: How To?

  Let us know how it shapes to the top.

• The PCIe for USB 6211 OEM replacement

  Hi you all,.

  We want to change our design to use PCIe card data acquisition, since we had a few USB driver problem in the past. Is the PCIe-6321 a good match to replace the capture USB-6211-OEM card

  Is there a better alternative?

  Thank you

  Fabrice

  Hello Fabrizio,

  Thank you for taking an interest in our line of PCIe cards DAQ. I took a glance at the USB-6211 OEM and PCIe-6321 to see if they are similar in specifications and capabilities. I would say the 6321 is a good match to replace your current USB card. As long as you intend to use no more i/o lines than expected or exceeds the designated sampling rate then it should be a good substitute.

  If you need high speed sampling or more i/o lines for various tasks, then another card can better meet your needs.

  The resources below compares several of our devices (USB and PCIe) X series.

  What is NI X Series? -1. Presentation of the product

  ---

  These links may also be useful during your upgrade:

  Major differences between series E, series M and material X NI DAQ series

  ---

  Guide to upgrade NI X series (USB to USB devices however)

  ---

  Kind regards
  Alex C.

• USB-6211 - digital output not supported?

  Hi all

  I can't use the USB6211 device port... I use daqmx with Delphi7 API functions.

  First of all, I tried this:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port0'), ", DAQmx_Val_ChanForAllLines);
  DAQmxWriteDigitalU8 (TaskDO, 1, 1, 1, DAQmx_Val_GroupByChannel, $FF, @written, nil);

  I had an error in the DAQmxWriteDigitalU8:-200012 (= digital output not supported). (???)

  OK, I tried to disable autostart option based on DAQmxWriteDigitalU8 and insert a 'manual' start in the code:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port0'), ", DAQmx_Val_ChanForAllLines);
  DAQmxStartTask (TaskDO);
  DAQmxWriteDigitalU8 (TaskDO, 1, 0, 1, DAQmx_Val_GroupByChannel, $FF, @written, nil);
  DAQmxStopTask (TaskDO);

  Now, I got the same error in DAQmxStartTask:-200012 (Digital Output not supported, once again). (?????)

  I don't understand.. 'Digital output not supported "? USB-6211 has 4 lines! What is the problem?

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

  -Cs George-

  Well, finally I figured out...

  Here is the solution:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port1'), ", DAQmx_Val_ChanForAllLines);
  DAQmxWriteDigitalU8 (TaskDO, 1, @dummy, 1, DAQmx_Val_GroupByChannel, @bitmask, @written, nil);

  Digital output lines are on port1! Corrected parameter.
  And the part of the interface of DAQmxWriteDigitalU8 had to be changed (in nidaqmx.pas).
  I don't know why, but the AutoStart (dummy) parameter in the DAQmxWriteDigitalU8 function is ignored: function always starts task automatically, regardless of the value of autostart. But this isn't a problem for me.

  -Cs George-

• How to troubleshoot the work of e/s digital USB 6211

  My e/s digital USB 6211 suddenly stopped giving digital output. Board of directors when connected, LED flashes and passes the self-test. But refuses to give any digital output. Can someone help me please?

  Thank you for your time. Technician came and found this Terminal connector was loose. Problem is solved

• Sampling frequency for the output of an acquisition of data USB-6211 card?

  Hello-

  I use a CGI CMOS FireWire camera to read an interference figure, then using a transformed of Fourier transform spectral interferometery (FTSI) phase recovery simple algorithm to detect the relative phase between the successive shots.  My camera has a linear 28 kHz scan rate, and I programmed my phase retrieval algorithm take ms ~0.7 (of a trigger of camera at the exit of the phase). I use the live signal to control a piezoelectric stack, by sending a voltage single sample to the analog output of a data USB-6211 acquisition card.

  Send this output voltage increases the time of my loop 4 m, I would really like to achieve a 1 kHz or better sampling rate. Is the problem with my DAQ card or with the processor in my computer? The DAQ cards of NOR can support these speeds?

  Thank you

  -Mike Chini

  Hey Mike,

  With USB, your loop rate will be around or under 1 kHz, even on the best of the systems. USB has a higher latency and less determism PCI and PCIe. You can get rates AO one much better sample on a PCI card, potentially a PCI-6221. We have a few HAVE points of reference for targets of RT for PCI, / AO in a loop, you should be able to get similar performance in Windows, but if you do a lot other treatments may suffer from your local loop rates.

  Hope this helps,

  Andrew S

• AI data seem to be fallen on the NI USB-6211 case

  Hi all

  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.

  If you have a thought, please let me know.

  Thanks, Matt

  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.

  However, as you pointed out, my use of the DAQmx Read and add waveforms is unnecessary and causes data drops that I demanded a fixed number of samples each time.  I have since implemented the reading as you suggested and everything works perfectly (and uses a lot less time CPU).  Thanks for the comments.

  Cheers, Matt

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

  Hello

  I need assistance to complete a task.

  The task:

  Record a switch contacts twists every 5 microseconds (200 ksps / s).  DAQ cards I have at my disposal at the present time are PCI-6224 and the USB-6211. The two cards are rated up to 250 kech. / s. I only watch 1 channel that will monitor the voltage.

  Here are the settings I use:

  CSR

  Continuous samples

  Sampling rate of 200 kech. / s

  Analog DBL1 1 sam chan

  timeout of 10 seconds (Read DAQmx)

  The problem:

  (1) every time I try to taste 200 kech. / s I get an error that reads

  Measurements: Tried to read samples that are no longer available. The requested sample was already available, but has since been replaced.

  Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  (2) when you try to taste at a much slower pace of 50 kech. / s, the speed of the loop iteration is not realizing this speed setting.

  My question is this: are these 2 cards (PCI-6224 or USB-6211) DAQ fast enough at my request and I do something wrong? OR

  I use the wrong hardware to accomplish my task?

  Thank you in advance,

  Gerardo

  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.

• Satellite A500: update BIOS V1.50 is fan noise problem reappears

  I have a Toshiba Satellite A500 with fan noise problem.
  It has been partially resolved the upgrade of BIOS from v1.20 to v1.30, according to this thread:
  http://forums.computers.Toshiba-Europe.com/forums/thread.jspa?threadID=46719&start=0&TSTART=0
  

  Yesterday I updated the BIOS v1.50, and the sound of the fan returned.
  I do not recommend this upgrade if you have had the problem of fan noise.
  

  I have downgrade BIOS v1.30 and fan noise problem is solved again.
  I know that people have problems to get the downgrade to BIOS, so I describe the process in this thread:
  http://forums.computers.Toshiba-Europe.com/forums/thread.jspa?threadID=50577&TSTART=0

  Thanks mate for sharing this with us

  But perhaps you could use the v1.5 BIOS and could reduce or reduce the activity of module cooling in Vista/Win7 power management settings.
  It would be interesting to check it out

  In any case thank you for this info

• 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;
  Jamal

  Hi jm56789.

  I think that the information you are looking for is located on Via MAX (Measurement and Automation Explorer) by creating a task of angular Position for your device.

  The default screen that should come has the Configuration tab selected.  In the middle of this component, there is a box that lists the "connections".  In my case, it says channel should be on PFI0 and canel B on PFI1.

  I hope this helps.

  Michael G