With the NI 9205 module Max sampling rate - problems

Dear friends,

I develop a project of lv, which makes and control system of engine dyno. The material is CRio-9022 with other cards and also 9205 for AI. There is an encoder for angle attached to the motor shaft with 3600 chatted by Tower as well as an index to indicate the end of a revolution. the output of the encoder is measured by card 9411. The speed of the motor is 1500 rpm. I measure pressure data and couple when I receive a 'tick' of the wheel. This means my sampling rate for pressure and torque each is 90KO/s.

but I was not successful to lead it. The program is great and I can show them, but I believe that there is a problem in the choice of material for the task. With the data of pressure and torque of the 9205, I also measure other channels for the controller output mass flow and temperatures. So in all I use 8 channels of the 32 available. But only the pressure and torque are acquired at the wheel-driven sampling rate. the rest are acquired about 5 times per second.

Since the 9025 is a multiplexing ADC, 250K sampling frequency is divided by the number of channels accessed = 250 K/8 = 31 K samples/channel. With this in mind, I decided to acquire data of pressure and torque with each beat 3rd rotary encoder, essentially on 30K samples/s sampling. However, I see a large amount of noise.

So I decide to average more than 1 second cycles (so the engine runs at about 25 cycles/sec, I averaged over this issue). The resulting pressure and torque graphics do not match with those measured by an oscilloscope in terms of amplitude but the frequency and shape is correct.

I noticed an interesting feature in the charts. When I pass interpolation between the points, I see several curves made by points instead of a continuous locus of points. Accordingly, I find that the acquisition is slower than necessary, and so there are less number of points sampled as required. These points are not synchronized 25 cycles I have on average and therefore the separate "curves". It is because of the possibility that some points receive a higher number of 'contributions' several times (when you add), the neighbouring points.

so I conculde that the 9205 is not fast enough to do the job. also noise, perhaps due to crosstalk or gosting when the mux changes channels. the impdences output pressure and the couple are of the order of 10 K ohms.

the Labview code outline: well, there is a vi FPGA, which takes the rotary encoder ticks and sends a signal to the case of each 3rd tick. The signal contains a 16-bit integer, indicating the number of ticks. This signal is sent to a 1 element FIFO. This fifo is read in a parallel while loop, where it remains awaiting a new element. The while loop bed fifo, where data are available, takes a measure of pressure channel. A node memory of the method is called to provide data according to contained in the index number equal to the number of ticks to signal fifo. Then he adds the current pressure reading to the reading of the memory and stores the sum in the same memory location.  Thus, an array of elements of 1200 is formed, where each elemnt is a sum of the values taken of more than 25 cycles. This memory is transferd to a dma fifo and reading side host. is done similarly to involved couple. host-side the fifo is read and divided by 25 to get the average. This average is displayed on a waveform graph.

Please check the attached file to get an idea of the problem. Sorry for the long post.

Please suggest if you understand the problem and suggesstions or solutions.


Tags: NI Software

Similar Questions

  • With the help of modulated signal pulse width (square wave) to control when a signal is enabled or disable

    With the help of modulated signal pulse width (square wave) to control when a signal is enabled or disable

    Hello all

    I am using a modulated signal to labview created pulse width (square wave) to control when a signal is activated or not.

    Here is my logic and a concrete example:
    (1) the wave source signal is continuous
    (2) use a PWM (square wave) created in labview to control when the signal is enabled or disabled
    (3) if the PWM (amplitude) signal is superior to 0 play signal PWM is not greater than 0 do not play signal.

    I use actually this to the sequence step / pulse several distinct magnetic coils using my audio card (which has several channels of audio output), I have a signal in labview played constantly.  As to compare it to the PWM (square wave) which controls whether or not the signal is played on each separate channel.  That way I can control which coil is on and offshore and in what order they are activated.

    I couldn't find an edge detection for a square wave created in labview, so I tried the limits, but it doesn't seem to work unless I change the phase manually and it only goes 1-1.  I'm just trying to compare the PWM (edges of the square wave) already created by labview / play a signal if the pulse is greater than 0 and it shuts off the signal, if she is less than 0.

    Should I do this another way

    TIA

    A waveform contains an array of values. You must check every value and respond accordingly:

  • whenever I start my windows, the dialog box appears with the words "persistence module a work stoppage" how to fix this problem?

    whenever I start my windows, the dialog box appears with the words "persistence module a work stoppage" how to fix this problem? someone help me please tell how to fix

    Hello

    1. have there been recent changes to the computer before the show?

    I suggest you to try the steps below and check if it helps.

    Method 1: Start your system in safe mode and check if the same problem occurs.

    http://Windows.Microsoft.com/en-us/Windows7/start-your-computer-in-safe-mode

    Method 2: If the question does not exist in Mode safe mode then try to put your computer in a clean boot state.

    By setting your boot system minimum state helps determine if third-party applications or startup items are causing the problem.

    How to troubleshoot a problem by performing a clean boot in Windows Vista or Windows 7:
    http://support.Microsoft.com/kb/929135

    Note: After the boot minimum troubleshooting step, follow step 7 in the link provided to return the computer to a Normal startup mode.

    Hope this information is useful.

  • After editing an image in windows Photo Gallery can't save the picture. I get a message that tells me that something is wrong with the application. How to fix this problem?

    After editing an image in windows Photo Gallery can't save the picture. I get a message that tells me that something is wrong with the application. How to fix this problem?

    Hello

    I suggest you to refer to this link and check if it helps:

    http://Windows.Microsoft.com/en-us/Windows-Vista/Windows-Photo-Gallery-frequently-asked-questions

    It will be useful.

  • Error downloading Photoshop element 12: Arvato Berthelman - Download Manager error - unfortunately, there is a problem with the link to that file. This problem may be due to the number of users trying to download

    Error message when downloading Photoshop element 12: (I bought the license in a store)

    Berthelman arvato-

    Download Manager error-

    Unfortunately, there is a problem with the link to that file. This problem may be due the number of users trying to download the file, or the product may no longer be available. Please as minutes of a few in. If this privilege is still not available, please contact customer service at the address [email protected] or number 604-915-5200

    == > Les DEUX @ and phone number are fake!

    Hi Mireille56,

    The place where you are trying to download the software.

    [email protected] is not an email from Adobe Support.

    Please try to download Photoshop elements 12 of: http://www.adobe.com/cfusion/tdrc/index.cfm?product=photoshop_elements&loc=us&sdid=ZPQM

    Kind regards

    Rave

    < translated="" via="" google="">

    Hi Mireille56,

    Where you are trying to download the software.

    [email protected] is not an Adobe support email.

    Please try to download Photoshop elements 12 from: http://www.adobe.com/cfusion/tdrc/index.cfm?product=photoshop_elements&loc=us&sdid=ZPQM

    Kind regards

    Rave

  • cDAQ and NI 9205 NI9203 NI9225 problem with the detection of modules

    Hello

    We bought a cDAQ-9188 and modules NI 9205 NI9203 NI9225. My problem is that the MAX does not detect these modules.

    The cDAQ must be correctly installed and configured as it is in the list of devices. I checked the monitor of the device is running.

    If anyone knows help me? Thank you

    I've attached a screenshot of NI MAX.

    The reason for this is that the firewall blocks him ports NOR resolved max. by adding exceptions in the firewall

  • With the help of time interleaved sampling (TIS) to get the highest sampling rate of data acquisition card

    I tried enabling to TIS using nodes of property for the appropriate channel and by disabling the TIS for strings, I don't want to use. When I do that, I get the following error:

    niScope read Cluster.vi:1internal software error has occurred in the extended software. Please contact the support of National Instruments.

    Name of the component: nihsdru
    File name: p:\Measurements\highSpeedDigitizers\hsd\driver\trunk\1.10\source\redirection\tHardware.cpp
    Line number: 1038

    State code:-223425

    Any ideas what to do?

    Thank you, but I managed to fix it with the help of a few colleagues.

  • On the NI PCI-6221 fast sampling rate question

    Hi I was wondering if someone can answer a question of sampling rate on this card to PCI-6221 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/14132).

    Especially if I wanted to transmit simultaneously (analog output) and data acquisition (analog input), what is the sample rate max I could use. Kind regards.

    Since the 6221 is multiplexing the analog input, your question for I / simultaneous ao is possible for one channel of the only. If your "simlutaneously" can include delays (e.g., 100us), you may be able to work with several AI channels as well...

    HAVE the multiplexes, workable sample rate given that the total sample (250 kHz) frequency divided by the number of channels that you use. AO is faster than HAVE it, so it does not reduce this number.

    hope this helps,

    Norbert

  • How can I use an accelerometer on a cRio 9012 with the NI 9233 module?

    I'm putting in place a system of vibration using a search of wilcoxon accelerometer 797-33. Is there some setting you have to light to light the target NOR?

    I used the getting started with the example of 9233 as base. However, it will only read 0, while the vi is running

    The power of the module 9233 is always.  Its successor, the 9234 contains options to be turned off, and by default the 9234 is turned off.  So with the 9233, is always under tension.

    You can watch the specific\NI LabVIEW\examples\compactRIO\module 9233 examples for some ideas on coding.

  • Satellite L30 10Y does not start with the new RAM modules

    Hello
    regged just with this forum I have a problem to upgrade memory.

    I read through a few problems of memory here and all users that it is a problem of memory comaptible. I got Hynix 512 MB RAM in my laptop and I bought 2 x 1 GB memory Hynix these two are match sticks to the installed memory, but when I installed my laptop wouldn't boot at all. It would only boot if I had a stick in both.

    I tried to switch ports top and btm and even when a stick was installed it says in XP, Vista and Windows 7 (yes I tried all systems) 896 MB of available space. I even tried to use my other Hynix stick, but he won't start and showed more stick of 1 GB (896 MB usable in Windows 7). After reading all the threads I wonder if it is a hardware failure or is there a fix in the world of Toshiba or perhaps in the world of Toshiba, the L series is almost obsolete and not worth to help people who unwittingly bought their goods.

    I apologize for being slightly down on Toshiba but a laptop that shows what he can work and is not a company should hold his hand up and say that Yes, there is a fault and help deal with the problem.

    You see 896 MB, because the rest is reserved for VRAM for graphics card.

    Sometimes RAM may simply be incompatible, because of incompatibilities of calendar or RAM chip/controller design differences.

    What speed and timings is your original RAM?
    PCxxxx / DDRxxx =
    Schedules CASES/RAS =.

    What speed and timings is your new RAM?
    PCxxxx / DDRxxx =
    Schedules CASES/RAS =.

    You can display this information using a utility called CPU - Z
    http://www.CPUID.com/cpuz.php

  • CANOpen - sample rate problem

    Hello

    I use the CANOpen toolkit to communicate with a sensor that can be set at a sampling frequency of 1 kHz. Before I used the standard frame API and there I received my PDO objects to each MS because I want to make programming easier I would use CANOpen. But I can't set the sample rate of 1ms. When you use 2ms data is not transmitted with the correct timestamp interval.

    I have attached the message error code when you use 1ms as sampling frequency and the part of the diagram block with the initialization of the PDO.

    Maybe someone can give me a hint.

    Best regards

    --
    Joachim

    It is good, your sensor begins to send pictures as soon as you start communication.

    You might remove the remote setting function and then it would behave like your old application framework API, except for one detail.

    Your old approx. api framework its mult read read all available images.

    The CANopen Read is only a single point read. Thus, he read only a single image. This means that you need to run the loop in ms rate, that is really risky with windows.

    You can enable buffering, but it can lead to errors of overflow, or turn off the buffering is now and read the most recent value.

    See the example updated the.

    DirkW

  • After starting hearing sound becomes distorted (sample rate problem?)

    Hello!!

    Just when I start the program (Audition 2), I noticed that all the sounds that play inside or outside the program are distorted. He

    kind is sound that occurs during playback of a file to the frequency of sampling, kind of digital noise.

    When I stop the program and start any sound or a mp3 file on the computer, he continues to play distorted. It happened immediately and did not have before.

    I have Windows XP. The audio driver is "Soundmax Digital Audio". The audio driver is "Audition Windows Sound".

    At the hearing, in the Control Panel, hardware Audio Setup, "directsound output ports" are defined Soundmax Digital Audio with the size of buffer 2048; audio channels: 2 ; Bits per sample: 16. Said of the driver properties: 44100 Hz sampling frequency of; clock source internal, samples of size 2048 buffer

    There is no problem with my drivers or anything. I have no idea why this has happened.

    Any ideas would be greatly appreciated! I hope it's a sort of hearing that must be adjusted.

    I had this happen when I used a card firewire motu back in the day.   It worked fine for a few days and all the sudd

    en I'd get the loud pop and the line in my record.  I sold it after finding that it was not compatible with my windows upgrade.   Here are a few ideas that might help you

    • Your sound card has a windows update and threw it out of your drivers. Try to re install your drivers again now that your pc has updated.

    Hope that helped.

  • Firefox 5 does not work with the AVG and Google toolbar, among other problems

    I downloaded Firefox 5, invited by Filehippo. Among other things, my anti-virus sw were not compatible, the Google toolbar disappeared and could not be put back because I was using an old browser! I did a system restore with the result that Firefox did not work at all. I went back to version 4, only because a guardian program requires firefox, otherwise I'd returned to Windows Explorer. It cost me a lot of valuable time.
    I tried to make this complaint under the feedback, and the button send didn't work.

    Google must update the program toolbar for Firefox 5.0.

    The 7.1.20110512W version Google toolbar works in Firefox 5.0 using the add-on Compatibility Reporter, I tried it myself because of the large number of comments on the problems of the GTB.

    https://addons.Mozilla.org/en-us/Firefox/addon/add-on-compatibility-reporter/

  • iTunes update errors with the following message appears: there is a problem with this Windows Installer package. A program run as part of the set up did not complete as expected.

    iTunes error update

    I am trying to install an update to iTunes on my laptop and find the folowing part-way through the installation error:

    "There is a problem with this Windows Installer package. A program run as part of the set up did not complete as expected. Contact your provider to support personal or package. »

    I got iTunes for 3-4 years now and have always been able to install updates successfully, so don't not sure what is the problem.

    I tried msconfig and changed the boot process, so it includes all of the non-Windows elements, as suggested on the Microsoft Web site, but that has not worked.

    Can anyone help?

    Thank you

    The instructions were to contact the vendor of the package. This isn't iTunes, Microsoft.

    Ask the question in the Apple Forums:
    https://discussions.Apple.com/index.jspa

  • The version of this file is not compatible with the version of windows you are runing problem.

    IM facing problem installing some software: the error message is below to:

    The version of this file is not compatible with the version of windows that you are running, check your computer's system information to see whether you need a x 86 version or x 64 of this program and then contact the software publisher

    while trying to change the compatibility to windows 7 option does not appear

    Windows 7 will not be included within the compatibility list, because you are already using Windows 7. Your only option is to contact the Publisher of software (the company that built the program) and get a version that works with your computer type (64 bit or 32 bit, whichever one you have).

Maybe you are looking for