How to read frequency channel & voltage channels at the same time with different rates?

I am using a DAQCARD 6036E with a SCXI-1000 chassis.  I have a SCXI-1100 & a SCXI-1126 modules, along with a SCXI-1124 AO module for voltage output.  I am acquiring several voltage input channels with the SCXI-1100 & one frequency channel (frequency signal upto 12000Hz) with the SCXI-1126.  I want to configure all the channels in the Measurement & Automation so that I can use the Scale function to setup all the channels.  I am using a higher acquisition rate for the frequency channel than the voltage channels.  I had the block diagram as attached.  When I run the vi, I had the resource problem.  The err. msg. is: the specified resource is reserved..  Any suggestions as how to acquire a frequency signal & several voltage signals with this system setup using the DAQ-mx?
Attachments:
Document.rtf ‏4727 KB

Since a common ADC is shared with all your SCXI analog input channels , you will have to sample all channels in a scan list at same sampling rate.
However, you can set up frequency and voltage virtual channels using different instances of "create DAQmx Virtual channel" function in the same task as shown in attached pic, set scan rate and read them using a single DAQmx read
Attachments:
vi.PNG ‏6 KB

Similar Messages

  • How to count frequency of two signal at the same time ?

    Hello every one
    please help me with this one i am really stuck.
    The situation   : I have two square wave signal, and i want to measure the frequency of both of themat the same time.
    the problem : Error -50103 occurred at DAQmx Read (Counter DBL 1Chan 1Samp).vi:3
    Please see the attachement.
    i also have 3 analog inputs to be measured.
    but i dont have any problem with the analog inputs,,,multiple analog  inputs can easily be measured,,,,,but the prob lem is in the digitl (square wave ) signals. 
    Attachments:
    i want to use two counter input.GIF ‏54 KB
    two counter tasks1.vi ‏250 KB

    NI has an excellent overview of the accuracy and tradeoffs of the different freq measurement methods titled  "Making Accurate Frequency Measurements."  To boil down the essence of it, the (possibly) increased accuracy of the 2-counter method depends on a relatively long collection / accumulation time which would in turn typically limit the rate at which you could update your measured freq value.
    Now let me offer some friendly but blunt advice.  LabVIEW makes it easy to collect data.  However, there are many other factors affecting the usefulness of that data.  I support the dictum: "It is hard to measure *well*."  Choice of sensors, their sensitivity to environment, various sources of noise, an understanding of the decision to be made from the data, programming methods, etc.  And even more etc.
    What I mean is that just because a hardware freq measurement can be performed that is precise to 1 part per million, it would be very RARE in a test that ALL of those 6 significant digits prove useful.  In your app, the measurements are presently only approximately correlated in time.  And the gap of blind time between measurements will usually represent a much longer period of time than the measurement itself.
    Analogy: suppose you had a 100 minute film at 25 frames/sec for a total of 150_000 frames.  Now start selecting individual frames that are separated by some random # of frames between about 200 and 500.  In the end, you may end up with a sequence of 400 frames in the correct order.  Each individual frame is VERY accurate, but the collection of all of them can zip by in 16 seconds and not give you a much understanding about the movie.
    What would usually work out much better is to sacrifice some accuracy in order to collect a greater quantity of frames.  You trade off the instantaneous accuracy for the overall coherency.
    Sorry, got on a roll...   Back to your question.  My own preference is almost always to avoid consuming hardware resources when not truly necessary.  I've been toying with counters for many years and have still never once deployed an app using a 2-counter frequency measurement.  I do the 1-counter measurement and save the other counter(s) for other purposes. 
    If you've got an M-series board, the 80 MHz timebase allows you to measure a 500 kHz pulsetrain with a quantization error of only about 0.06% (1 part in 160).  There's a pretty fair chance that whatever physical process emits that pulsetrain isn't appreciably more stable than that
    -Kevin P.

  • How can I maintain two tables content at the same time with SM30

    Hi all,
    I created two customizing tables that I would like to link together for maintenance in SM30. Table 1 is the header and table 2 can have multiple detail records.
    They are linked via the ID key field. I would like to run the Table Maintenance Generator on the first table in SE11 and be able to maintain both table data at the same time in SM30.
    How can I do that without any ABAP programming? Should I use Append or Include structure or else?
    Thank you for giving as much detail as possible.
    Regards,
    Sylvain

    Hi,
    You cant do it w/t abap programing.
    You can code in "EVENT" to achive the same.
    Open table maintainance generator of first table through se56 or se11.
    follow the path: environment>Modification>Event.
    Select sutaible event from drop down like Before Save... and do coding.
    In this way data will be saved in second table automatically when you save in first table.
    In case of any query, please revert.
    regards,
    Dhan

  • 16 channels of audio recording at the same time with a MAC BOOK?

    Hi,
    I want to know how many channels of audio I can record at the same-time with a MAC BOOK (2.16GHz Intel Core 2 Duo, 1GB memory 120GB hard drive, Double-layer SuperDrive), firewire audio device and Logic Pro 8?
    You see I am aiming to record a live gig and I want to come into a firewire recording interface with 16 channels of audio all at the same time (24-bit, 44Khz) Does anyone know if this is possible? Or am I looking for trouble? No plug-ins will be used just record straight in. Anyone have some experience with this?
    Thanks.

    Ok, like this:
    Macbook - FW Port - FW Cable -In- MOTU Traveler -Out- External Harddrive.
    Firewire is capable of chaining units.
    Also plugged into your motu traveler will be an optical cable coming from the ADA.
    This will carry the 8 channels of audio it outputs.
    Also another good thing to do is to also have an optical cable FROM the optical output of your Traveler into the Behringer's input.
    That way you can sync the Behringer's digital clock to that of the Traveler, giving you a slightly better sounding signal that if you were to sync the traveler to the Behringer. This is simply because the traveler has a better quality digital clock than the Behringer unit so it's best to use that. To do this you just select "Adat input" on the back of the Behringer, and leave the Travelers sync to "Internal Clock". It is only a very very slight difference and you may not be able to notice the difference but for the cost of an optical cable it's worth doing.
    It will all make a lot more sense when you have the two units and the harddrive all plugged in.

  • Can i use 2 channel of USRP at the same time to receive a signal?

    Hi everyone,
    i want to do an implementation of time difference of arrival estimation between two receivers (antenna). I have an USRP  kit, daughterboards and two antennas. There is only one source signal ( it is transmitted in anywhere it doesnt matter).
    Can i use two channel of USRP at the same time to receive  a signal ?
    I need the original source signal and time-shifted version of this signal. 
    Many thanks for your help.
    Sincerely yours,
    Uysal.
    Solved!
    Go to Solution.

    Hello,
    I found this forum post which may be helpful to you.  It looks like you can't receive from the two antennae in the way that you describe.  I think this would require a two USRP setup.
    Jon F.
    Applications Engineer
    National Instruments

  • How do i start video and audio at the same time in ios

    How do i start video and audio at the same time in ios?
    I have tried a lot of different ways but i cant figure it out?
    I can get the sound and animation (timeline) to start playing.
    There is no problem to start the video and the animation at the same time.
    But i cant get both the video and the audio to start playing when i press a button.
    It works great in OSX and on windows?
    Here is an example:
    // insert code for mouse click here
    // Play an audio track
    sym.$("_1")[0].play();
    // Play a video track
    sym.$("host")[0].play();
    // Play the timeline at a label or specific time. For example:
    // sym.play(500); or sym.play("myLabel");
    sym.play("marker1");

    If the game has sound in it (and possibly even if it doesn't) it may be overriding the Music app and causing it to stop playing - in which case there is nothing that you can do about it.

  • How far will the extreme reach and how many users can be on there at the same time?

    How far will the airport extreme reach and how many users can be on there at the same time?

    Last question first, since that is the easy one......approximately 50 (fifty) users for wireless depending on how active each user might be.
    The first question is much more difficult, as distance is not really the issue with wireless.....obstructions are the issue.
    A wireless signal can easily travel 300 feet or more with no obstructions in the signal path.
    But, a typical wall of sheetrock or wallboard in a home will absorb....on average....15-20% of the wireless signal. Brick or adobe will obviously absorb much more. A ceiling....because it is thicker....will absorb about 25-35% of the signal.
    So, if the wireless signal must pass through several walls and a ceiling, there won't be much, if any, of the signal left....even though the distance that the signal travels is not great...for example, 20-25 feet.
    Other wireless networks around you at the neighbors can also affect the relative strength of the wireless signal.
    The bottom line....locate the AirPort Extreme where wireless devices will receive a signal with the least amount of obstructions in the signal path. Your actual performance cannot be predicted in advance. You will not know how well the AirPort Extreme works for you until you try it out in your home.
    If you find that the signal does not reach as far as needed,  you will need to add additional "extenders", like an AirPort Express to provide more signal coverage.

  • HT2905 I have multiple album titles of the same name with different artists. How can I get them to go under one album title again?

    I have multiple album titles of the same name with different artists. How can I get them to go under one album title again?

    In iTunes(on a Mac or PC) just tap on 'Albums' rather than 'Artists' and you'll see them all together.
    You may find that there are songs mislabelled. In which case right tap on the Album or Artist and tap 'Get Info', then change to the correct name and the songs will join the rest of the songs for that Artist or Album.
    Then resync with your iPhone and all will be well.

  • Can anyone give me simple instructions on how to use more than one ipod on the same computer with itunes? Both my daughters have ipods, my wife has one

    Dear All
    Can anyone give me simple instructions on how to use more than one ipod on the same computer with itunes. My daughters have a different generation 'nano' each & my wife a 'shuffle'?
    Many thanks

    Click here for options.
    (69081)

  • How do I copy purchases between 2 itunes libraries on the same computer with different log ins and separate apple user ids?

    How do I copy purchases between 2 itunes libraries on the same computer with different log ins and separate apple user ids?

    Load the library which doesn't contain the songs and drag them into the open iTunes application window. If you need to move them between different computer user accounts, put them into /Users/Shared/.
    (74502)

  • How to change keyword in many pictures at the same time?

    I gave a big series of pictures the wrong keywords. Now, I can't figure out how to change them (besides one by one...).
    If I select e.g. 10 pictures in Library-mode, how to change keywords on them all at the same time?

    Make sure you are in Grid View, primary monitor (if you have two), select 10 pictures and type (or delete) the keywords in the Keywording panel in the left upper corner.
    Make sure the Metadata->Show Metadata for Target Photo Only is unchecked in the menus. Otherwise your edits will only apply to the primary selected (most selected) image.

  • How many people you can do facetime at the same time?

    how many people you can do facetime at the same time?

    As many faces as the screen will fit. 27" iMac can fit quite a lot of faces.

  • How can I run 2 Dreamweaver windows at the same time?

    How can I run 2 Dreamweaver windows at the same time on my
    PC?
    basically I have 2 monitors and I want to edit CSS on one
    monitor and have the html page open on the other so I can quickly
    look from one to another with in a split second instead of taking
    that extra time to switch back and forth using the tabs at the top,
    I know I should probably invest into a mac so i can work out side
    of the Dreamweaver application window and I will in the future but
    is there any way i can do this on my windows XP pro PC?
    Thank you
    Maurice

    Open the CSS in DW, and use F10 to open the Code Inspector.
    Place the
    latter as needed.
    Murray --- ICQ 71997575
    Adobe Community Expert
    (If you *MUST* email me, don't LAUGH when you do so!)
    ==================
    http://www.projectseven.com/go
    - DW FAQs, Tutorials & Resources
    http://www.dwfaq.com - DW FAQs,
    Tutorials & Resources
    ==================
    "Random_Yggdrasil" <[email protected]> wrote
    in message
    news:gi2htb$j4j$[email protected]..
    > How can I run 2 Dreamweaver windows at the same time on
    my PC?
    > basically I have 2 monitors and I want to edit CSS on
    one monitor and have
    > the
    > html page open on the other so I can quickly look from
    one to another with
    > in a
    > split second instead of taking that extra time to switch
    back and forth
    > using
    > the tabs at the top, I know I should probably invest
    into a mac so i can
    > work
    > out side of the Dreamweaver application window and I
    will in the future
    > but is
    > there any way i can do this on my windows XP pro PC?
    >
    > Thank you
    > Maurice
    >
    >
    >

  • How to mute and lock screen rotation at the same time? Loved this feature in iOS 5.

    How to mute and lock screen rotation at the same time? Loved this feature in iOS 5.

    You cannot do two different simultaneous VISA writes over a serial bus. There is a single rx line on the pc's com port and a single rx line on the instrument. You only hope is if the instrument allows you to chain commands and the reception of the carriage return triggers the instrument to implement both at the same time. Maybe you can send CTS01 and CTS02 separated by a space or comma. The manual should tell you if that's possible or maybe you need to ask the manufacturer.

  • How do I get two screens up at the same time

    Hello.
    How do I bring up two screens at the same time so I can work on one and refer to the tutorials on the other?

    Hello Jazzy6491
    All you should need is another monitor and the appropriate adapter for it you plug into you MacBook Pro. Check out the article below on how to use multiple monitors with your Mac.
    OS X: How to use multiple displays with your Mac in Mountain Lion and earlier
    http://support.apple.com/kb/ht5019
    Regards,
    -Norm G.

Maybe you are looking for