What is the PCI-1422 external trigger input impedance?

I wish to drive this line and would like to avoid mismatch problems.

The trigger lines on the 1422 go straight into TTL buffers which have very high input impedance (in the megaohm range).

Similar Messages

  • What is the PCI bus performance of the 1422?

    I'm currently using an IMAQ PCI-1422 to acquire images from a camera. The image size is 1280x1024 @ 8-bits a pixel. Currently the camera can only run freely at 20 fps. So this data rate is roughly 26 MB/s. The IMAQ card seems to be able to acquire these images at that rate. However, I need to be able to retrieve these images into system memory at the same rate. At this time, I've only managed to retrieve the images at around 12 fps which is about 16 MB/s. Is this all I can reasonably expect from this card? There is no other activity along the PCI bus except for perhaps minor updates to the video display.
    I'm acquiring images using a Grab. I use a callback on the Buffer Done signal to trigger an acquisit
    ion running in another thread. Actually, I'd prefer to the acquisition in the callback itself, but I am uncertain as to how the callback is implemented and what I can and can't do in a callback. Is there documentation somewhere that I'm missing?
    Oh yeah. I'm using MSVC++ and Windows 98.
    Thanks

    I tried the example and removed the clipping the ROI to the size of the canvas and also took out the image plot to make sure we would get accurate times. I get the same frame rate with that example as I did with my own code (around 12 fps). Also, I neglected to mention that for my own code I placed calls to timers just before and just after the call to imgGrab, and the time difference is what you would expect: about .083 seconds (average) to retrieve one frame.
    I know nothing about the internal structure of the PCI-1422, but considering that we are retrieving images from the same SDRAM memory that is being used to acquire images, are we seeing some sort of bus contention on the PCI-1422 itself? Also, the camera I'm using is an evaluation board, and I have access
    to the schematics and should soon have access to the CPLD design. So I can verify the design of the camera itself. I'm glad to hear that you expect to be able to transfer at 45MB/sec. That probably means that there is something not quite right either in the camera interface or perhaps in the computer system being used. But if you have any other ideas, I'd be glad to hear them.
    Thanks for the response.

  • PCI 4472 external trigger source

    Dear All,
    I have a PCI-4472B which I want to program in order to acquire a signal from channel 0 whenever it recives a TTL signal throw the External Trigger input.
    I'm using a modified example but I don't know which is the name of the external trigger source. I always recive this kind of error (for example if I connect a string containing "EXT_TRIG"):
    code: "-200265"
    "DAQmx Start Task.vi:1<append>
    <B>Property: </B>Start.AnlgEdge.Src
    <B>Corresponding Value: </B>EXT_TRIG
    <B>Task Name: </B>_unnamedTask<DB>"
    The program I'm using is of this form:
    First of all, does this error mean that I didn't input the right external trigger source name?
    If so, which is the right name of the external trigger source for NI4472B?
    Thank you for help
    Solved!
    Go to Solution.

    Hello there,
    The error pops up because there is no channel named EXT-TRIG. If you are receiving a trigger from channel 0, I think the best way is to specify the channel name in the `DAQmx Start Task`.  There is a terminal where you can specify the channel name and use that name as an string input for the trigger. I think this should solve the problem. 
    I refered from this knowledge base. 
    http://ae.natinst.com/public.nsf/webPreview/BEBB10D02D72798A8625736B0076B09A?OpenDocument
    Also, seems like you have `start analog edge` trigger. Since you want to get TTL signal, why not try `start digital edge` trigger? 
    Regards,

  • Which digital camera is suitable for the pci-1422

    when i purchase a digital cam for PCI-1422 , what should i focus on, for example: Resolution, interface, depth of color or etc??
    How to classify the a digital cam and how to identify which is suitable for PCI-1422??
    Does anybody have recommandation for me!!??
    thanx!!!

    There are a lot of digital cameras that work well with the PCI-1422.
    Selecting the proper camera depends more on your application than the PCI-1422. You need to look at resolution and frame rate, along with bit depth, color or B&W, etc.
    You will also need to select a lens that matches your application. You might just need a fixed focal length, or you might need a zoom, a telecentric lens, or other possibilities.
    I would recommend discussing your application with Robert Eastlund of Graftek Imaging (800) 441-2118. He will be able to help you select the proper camera and lens for your application.
    Bruce
    Bruce Ammons
    Ammons Engineering

  • What are the problems in processing batch input sessions?

    hi,
    What are the problems in processing batch input sessions? How is batch input process different from processing on line?
    regards.

    sorry, question resolved.

  • What is the best way to handle input parameter

    When writing sub-vi's, what is the best way to handle input parameter range checking? On the front panel I can choose to have numeric values coerced to be within range, but this does not affect constants or controls wired to the vi when used as a sub-vi. I can build range checking into the vi, but this can result in a cluttered looking vi. Do you have any suggestions.

    As you discovered, the Range and Coercion properties of controls do not work when used in sub-vis.
    Your best option is to go ahead and build your range checking into your sub-vis. If it�s something you will be doing a lot, just make your range checking a sub-vi and drop it where needed. This will keep the clutter to a minimum. You may end up with more than one range checking VI if you need different functionality, but this will still make less clutter and easier re-use.
    Ed
    Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
    Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

  • Can I use the 2 digital triggers on the PCI-6023E to trigger 2 seperate Analog inputs on the same board?

    I want to monitor 2 analog DC signals (single point measurements, not a waveform) and I want to use the digital triggers to start the acquisition, 1 trigger for 1 AI. the measurements need to be made at 1Hz, maybe slower. Is this possible with the PCI-6023E?
    If not what hardware should I be looking at? I have a total of 6 triggers and 6 AI.

    Dimentia,
    I would need confirmation on what you want to do:
    1) I want to monitor 2 analog DC signals
    This means that you will have one Analog Input operation monitoring two channels. Please confirm.
    2) single point measurements, not a waveform
    Ok, no buffers.
    3) I want to use the digital triggers to start the acquisition, 1 trigger for 1 AI
    This would mean that a single digital pulse or edge on a single line would start your 2-channel analog input operation. Please confirm.
    4) the measurements need to be made at 1Hz, maybe slower.
    Hardware-timed or software-timed? 1 Hz could be easily implemented with software timing. But the triggering could force you to use hardware timing. It will not be a problem but it would be good to know.
    5) Is
    this possible with the PCI-6023E?
    Everything I mention above is possible with the PCI-6023E.
    6) I have a total of 6 triggers and 6 AI.
    This last phrase is what really confuses me and seems to contradict the previous sentences. Does this mean that you will want to perform 6 independent Analog Input operations, with its own triggers (one each)? Will every Analog Input operation have 2 channels?
    I'll clarify why this is important:
    - Each Analog Input operation can only have one hardware digital start trigger assigned to it.
    - Only one Analog Input operation (multiple channels allowed) can be performed per board at any time.
    Since the rates are so slow I would recommend that you perform sample all channels within a continuous acquisition and then discard the data that does not meet a certain condition. You could sample the triggers as well and discard those channels for which the trigger has not been received.
    These are just some ideas based on my assumptions on the
    problem. Assumptions are never a good thing so please confirm on the point s above and we'll try to help.
    Thanks
    Alejandro Asenjo
    Applications Engineering
    National Instruments

  • OK What About The PCI Buss Lock at 33?

    I read over at Anantech in the review of the k7n2-L that the PCI bus is not locked.
    From Anandtech:
    We still haven't been able to get confirmation from MSI as to whether the K7N2-L locks the PCI bus at 33MHz. There is an AGP lock at 66MHz for this board (as with all nForce2 boards). We'll immediately update you with more information as we receive it from MSI. 12/04/02 UPDATE: MSI sends word that the K7N2-L indeed does not have a PCI bus lock at 33MHz, meaning you will overclock your PCI bus to a certain level at a certain overclocked FSB speed.
    Now I have read here in a couple of threads that the PCI buss is lock at 33.
     So who is right???

    its locked guy at amd forums the wise one measured his on a pc gieger 33.4 regardless of fsb

  • What's the difference between an audio INPUT and AUX object?

    Can someone explain the difference between an audio INPUT and AUX object? They both seems to do pretty much the same thing ... when would you use 1 over the other?

    revDave:
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  • What is the better way to pass input parameters between components?

    Hi all,
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    Now which of the following is the better practice:
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    - Defining a node in BrowseWDP (child) with isInputParameter set to FALSE, creating a setter method in BrowseWDP Interface Controller for the collection (to be passed as parameters) and calling a wdContext.nodeBlaBla().bind(pInputParameterFromModelType). From BrowserWDPs perspective, I'd call this Push method.
    The colleague's argumentation in favor of Push has not convinced me at all and I'd like to ask your opinions. Is there a best practice or recommendation for this scenario? TIA
    ps: Any answer will be rewarded.

    Hi Cuneyt,
    Refer the links below, they are very informative!
    http://help.sap.com/saphelp_nw04s/helpdata/en/22/15a441cd47a209e10000000a155106/content.htm
    http://help.sap.com/saphelp_nw04s/helpdata/en/67/cc744176cb127de10000000a155106/content.htm
    These links are a part of the WebDynpro ABAP documentation, but the concepts are same for WDA and WDJ.
    Considering your scenario, I would recommend the first alternative you have mentioned (if you refer the second link its called External Context Mapping), where component controller context node of component A (SearchWDP) is the source for Interface controller context (same name) of component B (BrowseWDP).
    Thanks.
    Chitrali

  • What are the best affordable external drive options for my iMac ?

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    You can get a FireWire 800 drive and use an adapter to connect to FireWire 400. The connection won't be any faster on your iMac, but you can use the drive later with a Mac that does have FireWire 800. There are drives that have FireWire 400 and 800, and USB 2.0.
    I like the drives sold by OWC
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    http://eshop.macsales.com/item/Newer%20Technology/U2NV2SPATA/
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    Moderator: This forum is not dedicated for basic questions. Please, read SAP material before posting

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  • What is the error in this trigger

    create or replace trigger tt1
    after insert on EXERCISE2_T
    referencing new as new
    for each row
    declare
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        WHEN 'X' THEN 'Extracted';
        WHEN 'F' THEN 'Failed';
        WHEN 'S' THEN 'Skipped';
        WHEN 'C' THEN 'Cancelled';
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    3/30 PLS-00103: Encountered the symbol ";" when expecting one of the following:
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    LIKE4_ LIKEC_ between || multiset member SUBMULTISET_

    create or replace trigger tt1
      after insert
      on exercise2_t
      referencing new as new
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      v_excd                        exercise2_t.ex_cd%type
        := case ex_cd
        when 'X'
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          then 'Failed'
        when 'S'
          then 'Skipped'
        when 'C'
          then 'Cancelled'
        else 'no'
      end;
    begin
      insert into dwh_dex2_rd_t
                    dk_ex2, ex2_cd, ex2_nm )
           values (
                    :new.ex_id, :new.ex_cd, v_excd );
    end;
    /In other words: the semi-columns and the case-END.

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