Is it possible to pulse generate & measurement simultaneously in PCI6624

Is it possible to pulse generate & measurement simultaneously in PCI6624

Yes, using two different counters.
CTA, CLA, MTFBWY

Similar Messages

  • Is it possible to measure duty cycle of 6 pwn simultaneously using pci6624 board?

    Hi
    in my application i need to measure duty cycle of 6 pwm signal simultaneously  .
    Is it possible to measure duty cycle of 6 pwn simultaneously using pci6624 board?

    Here's what I mean...
    However, it only sends one command at a time. You didn't say if your servo controller requires all 4 commands at once. If so, then you can remove the case structures and concatenate all 4 slider values into one string.
    Message Edited by LabViewGuruWannabe on 11-15-2007 01:05 PM
    Attachments:
    SliderEvents-FP.PNG ‏31 KB
    SliderEvents.vi ‏36 KB
    SliderEvents-BD.PNG ‏63 KB

  • NI6602 pulse width measurement: Do I have to use an external sample clock?

    Hi
    In the .NET 4 example 'MeasPulseWidthBuf_SmplClk_Cont' it is stated in the comments that:
    An external sample clock must be used. 
    Counters do not have an internal sample clock available.  You can use
    the Gen Dig Pulse Train-Continuous example to generate a pulse train on
    another counter and connect it to the Sample Clock Source you are using
    in this example.
    I have an application running without specifying an external clock. The applications is running, but I'm not sure I can trust the recorded data. Here is the channel creation code:
                    task.CIChannels.CreatePulseWidthChannel(readTaskCounter,
                                                            "ReadPulswidthTask", 25e-9, 20e-6,
                                                            CIPulseWidthStartingEdge.Rising,
    CIPulseWidthUnits.Seconds);
    task.CIChannels.All.DataTransferMechanism = CIDataTransferMechanism.Dma;
                    task.Stream.Timeout = callbackTimeoutInMilliSeconds;
    task.Stream.Buffer.InputBufferSize = 50000;
                    task.SynchronizeCallbacks = true;
                    task.Timing.ConfigureImplicit(SampleQuantityMode.ContinuousSamples);
                    task.Control(TaskAction.Verify);
    Note that I'm not specifying any external clock.
    1) Which clock is the daq using? -It is obviously using some clock since I can collect data via this task.
    2) Do I need to change the configuration to use an external clock to achieve reliable readings - as mentioned in the 'MeasPulseWidthBuf_SmplClk_Cont' example?
    /mola
    Solved!
    Go to Solution.

    Hi mola,
    That specific example is for sample-clocked pulse width measurements.  This type of measurement is only supported on newer hardware such as X Series boards and will not run on the 6602.
    Your application that you linked uses Implicit timing, meaning that the signal itself serves as the sample clock.  That is, at the end of each pulse width that you measure, the sample is deterministically latched in.  So, you end up with a buffered array of every pulse width that is seen by the counter.
    Best Regards,
    John Passiak

  • Wiring hardware for pulse width measurement

    I am in difficulty.even with so simple pulse width measurement.
    I am using labview 7.1, DAQmx, MAX, PCI - 6220.
    I cannot find help document as to how to measure PW measurement and I find no connection diagram in MAX for using pulse width measurement.
    I connect to PFI 9 (Gate) to 5V via switch. What about timebase counter as source? Ok I wanted to use internal clock from PCI-6220. But I cannot get to measure PW.
    I want to MAX to measure. Once it is ok, then I will build a simple vi to understand its working better.
    Pls help.

    Hello,
    LabVIEW has examples that are located in the Example Finder under the Help menu inside of LabVIEW.  The examples specific to pulse width measurement are organized and located under the Browse tab of the Example Finder under the folders <Hardware Input & Output> <DAQmx> <Counter Measurements> <Period & Pulse Width>.  The Example Finder has an information section that has information on the Description, Instructions for Running, Block Diagram Steps, and I/O Connections Overview.  The last section will help with the connections.  The input for the example titled Meas Pulse Width – Buffered –Cont.vi will be the gate of the counter specified in the “Counter(s)” control on the front panel … such as Dev1/Ctr0.  So on your device the 6220, counter 0 gate is PFI 9 as you mentioned.
    I understand that you are interested in getting started with the Test Panel in MAX first.  The Test Panels are limited to Pulse Train Generation for counter output and Count Edges for counter input.  Please use the Count Edges if you are interested in testing the device with a counter input task.  However, the Count Edges will just be counting edges of the signal specified in “Edge Source”. 
    I also understand you are interested in using the internal clock from the 6220.  The example I previously suggested uses a DAQmx Timing.vi to configure the duration of the task … for example finite or continuous.  The Timing is set to implicit, since the signal wired into the gate of the counter is in fact controlling the timing.  The source of the counter task for pulse width is the internal timebase when using DAQmx Timing (Implicit). 
    “Create a Counter Input channel to Pulse Width.  It is important to set the Maximum and Minimum Values of your unknown pulse width as accurately as possible so the best internal timebase can be chosen to minimize measurement error.  The default values specify a range that can be measured by the counter using the 20MhzTimebase.” - from the description of the Block Diagram notes on the example.  I also link helpful KnowledgeBase below.
    AE KB 2X6CMDDS: What Does Implicit Mean in the DAQmx Timing VI?
    http://digital.ni.com/public.nsf/allkb/2B6477E3A9B7C07386256D1F0066FBDD?OpenDocument
    Samantha
    National Instruments
    Applications Engineer

  • Triggered single pulse width measurement

    I am trying to measure the width of a single pulse, but would like to use the pulse itself as the trigger for a counter input pulse width read using a PXI-6608.  I would like to do this since the pulse can come at any time (much longer than any practical timeout)  and I would like to avoid having to place a DAQmx read in a while loop waiting for the pulse to appear.  Also, while the pulse is high, I would like to produce front panel feedback (light a boolean indicator).  I seem to be able to achieve that by using a digital input line, but again requires a DAQmx read in a while loop.  I haven't had much experience with triggers and my attempts so far appear to seem like triggers are not compatible with counter input pulse width measurement.  Is it possible to set up a trigger for a pulse width measurement?

    Hello kayotik,
    I think the best thing to do here is to use separate while loops. You can put most of your code in a main while loop, and then put your DAQmx read in a separate while loop. Both loops can run in parallel (just don't wire any outputs of one while loop to the other while loop, because then one will become dependant on the other). In order to pass data between the two loops, you will need to use a local variable. The DAQmx read can write to a local variable, and the main loop can read from that local variable. 
    You will also need to stop both loops with a single stop button. This article shows how (and also demonstrates the use of local variables to pass data between independent while loops):
    http://digital.ni.com/public.nsf/allkb/267704CDE91156D186256F6D00711AAE
    Colden

  • Labview Rectagular pulse generator

    hi sir please give information about my topic
    1.how to design Rectangular pulse generator in labview
    2.how to we get amplitude shift keying of sine wave to produce pulses
    please see the image you can clealy understood my concept and give the necessary information about it and if possible provide block diagram also and im waiting for reply sir

    Hi guru,
    please stick with your original thread instead of creating double posts for the very same topic!
     please see the image
    When you continue to post in your original thread: Please attach real images instead of cryptic OFFICE file formats…
    Best regards,
    GerdW
    CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
    Kudos are welcome

  • When exactly do pulse width measurements start?

    I am using a PCI-6601 to measure pulse width and period of a PWM signal in LabView (DAQmx).
    I use ctr0 for the period and ctr1 for the pulse width. The period is measured between falling edges. As I am interested in the high pulses, the pulse width measurement is configured to start with a rising edge.
    I do a buffered measurement with continuous samples.
    I use a common start trigger (ArmStart) for both tasks.
    Everything works just fine, but one thing puzzles me:
    My start trigger can occur at any phase of the PWM signal, so I expected the first measurements to be invalid. This is true for the period measurement, but the pulse width is always correct. It doesn't matter in what phase my trigger occurs, the first reading of the pulse width is always correct.
    Can someone tell me why?

    This is speculation, but it's probably just that NI decided to follow slightly different rules for pulse width measurement than for some of the other counter measurements.
    I've done triggered period and semi-period measurements before, but don't know that I've done triggered pulse width or frequency measurements.
    For the two former cases, I know that the counter will start counting time immediately after the trigger edge.  The first measurement represents the time from the trigger to the first active edge period (or semi-period) edge.  It is often meaningless as you anticipated.  For pulse widths, I suppose NI simply decided that the trigger will arm the counter but you also need the pulse's leading edge before you start counting to measure pulse width.  So the first measurement is a true measure of pulse width and is never meaningless.
    If this is true, then it may be tricky to sync / correlate the data in simultaneous measurements.  For your particular app, you could get away with performing a single semi-period measurement and then calculating the periods and pulse widths.  In other apps, it could get more difficult.
    -Kevin P.

  • External sample clock with pulse width measurement

    Dear all,
    I am using a NI 6220 board (programming with ANSI C) and would like to perform a "single pulse-width measurement" using an external gate signal and an external signal as source.
    Using the  "DAQmxCreateCIPulseWidthChan" command the program and card works only partly as intended. Namely, the external gate did work, but the card uses the internal 80 MHz time base signal instead of the external source connected to the default source pin (PFI 8).
    I tried to route another PFI pin to the default source pin using the "DAQmxConnectTerms" command but this did not help either.
    Obviously, I am missing something...
    Best, Uli
    Solved!
    Go to Solution.

    Hi Uli,
    I posted to your thread here.
    Best Regards,
    John Passiak

  • Is it possible to open several documents simultaneously in Adobe Digital Editions?

    Is it possible to open several documents simultaneously in different windows in Adobe Digital Editions like Adobe Reader ?

    As far as I know, it isn't.
    You can run both ADE2.0 and ADE 1.7.2 at the same time, with different books open.
    Also Sony Reader (free download intended for Sony eReader users, but works even without) will let you have a third book open.
    ~~~
    There are lots of bugs in ADE2.0.  Try replacing ADE2.0 with the older but more reliable v1.7.2.
    (You can have them both installed at once if you like.)
    Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
    http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editions.html
    The forum software is sometimes corrupting the link above.  There shouldn't be a blank in 'editio ns.html'.  The following redirects to the same page: http://tinyurl.com/diged172
    https://ebookstore.sony.com/download/

  • PXI-6624 Pulse Frequency measurement

    Hi.  I'm working with a PXI-6624 and am interested in doing pulse frequency measurements to get both frequency and duty cycle on its inputs using DAQmx.  
    Whenever I go to create the virtual channel however, I get error -200431:
    "Selected physical channel does not support the measurement type required by the virtual channel you are creating."
    "Requested Value: Pulse Frequency"
    "You Can Select: Frequency, Period, Pulse Width, Semi Period, Two Edge Seperation, Position:..."
    Is this card really not capable of doing these pulse frequency measurements?  
    Solved!
    Go to Solution.

    Yes, the "Pulse" (not to be confused with "Pulse Width") measurement was introduced with NI's STC3 devices including X Series and CompactDAQ.  
    Pulse Measurement:
    However, you should still be able to measure frequency and duty cycle on your card with a semi-period measurement:
    Semi-Period Measurement:
    Images are from the X Series User Manual.
    The difference between the two modes comes down to how the data is stored and buffered on the card--with the semi-period method the hardware doesn't distinguish between high and low samples and puts everything into a single buffer.  However, if you start the counter off the appropriate edge (see below property node), then you would know in software the order of high and low samples and can pretty easily calculate frequency and duty cycle from this.
    Best Regards,
    John Passiak

  • Pulse width measurements

    Hello,
    I am trying to measure the pulse witdth of a signal that has a pulse width of 800 micro seconds.  I am using the pulse width measurement VI with an indicator on the pulse duration output.  The sample rate I am using to sample the signal is 10000 samples/sec.  The pulse width measurement VI is returning a value of 8.  I'm assuming that it is taking the pulse width of the signal and dividing it by (1/10000) which is the time between each sample.  Is this correct? 
    Thanks

    Hi Jimmy,
    You said that you were using the Pulse Width Measurement VI.  Are you using the Express VI (LabVIEW 7 or higher), the regular VI, or are you trying to use a counter to measure do your PWM?
    Perhaps you could post a snippet of your code.  It sounds like you've got the right answer, but knowing which method you are using could definitely help.
    Regards,
    Otis
    Training and Certification
    Product Support Engineer
    National Instruments

  • [cRIO] Pulse width measurement

    Hello,  I am working with cRIO-9074 with digial I/O module 9403. I was wondering where I could find examples or a list of function relevant to measuring the pulse width of a digital input (with resolution of about 10 usec).
    - Thank you 

    I've implemented something similar using the example given above, however due to hardware limitations I'm unable to use the SCTL, this isn't too much of a problem as I simply use a while loop with a 4-tick loop timer, however when driven with a constant digital signal I get the pulse width measurements 'bouncing' between two values, it's not out by 1 or 2 ticks, it jumps around 1000 ticks, it also 'sticks' when I slowly ramp up the frequency, suddenly jumping to other values
    any suggestions? I'm currently using the FPGA open function and accessing the FPGA in (I believe) scan mode, could this be the culprit? I've not undertaken the RT training course yet so I'd be poking in the dark a little
    this is for a proof of concept demo in a few weeks time!

  • Pulse Width Measurement

    Hello Friends,
    I am new to Labview. And now I am working on a project where I have to measure the pulse width.
    I have attached a pulse waveform and would like to measure the pulse width of the first rising the falling edge and log it , rest of the signal I am not interesed in.
    I will have this signal 6 times on my digital/analog input. 
    Can someone help me with the pulse width measurements.
    Thank you.
    Kind Regards,
    Attachments:
    Pulse width.PNG ‏60 KB

    I get this pulse ( as in picture attached), I want to get it on analog or digital pins in such a way in get the pulse width of only 1st edge.
    And this 1st edge lenght is different then the rest that follows. I would like to have the pulse width for only the 1st edge and log the width.
    And similarly this signal will come from 5 more different sources. So each signal is different.
    For now i connected it to AI0 and I can see the signal.
    1) next step measure only the first edge.
    2) 6X input channel 
    2) log it.
    Attachments:
    Pulse width.PNG ‏60 KB

  • NI 9401 pulse width measurement.

    Hello,
    I'm not sure I fully understand the pin-out diagram. At present I have a NI9401 in a NI 9172 chassis. 
    DIO0 and DIO1 are connected to light gates. I have an opto switch and I want to measure the pulse width when an object blocks passes through the slot. Can I use any of the other free input to do this?
    Free inputs are, DIO2, DIO4 and DIO5.
    The other I/O pins are being used as triggers. 
    Cheers
    K 
    Solved!
    Go to Solution.

    Hi Daisy,
    If you open your DAQ Assistant properties, and read the Measuring Pulse Width help on the side, you'll see that "You can use the counters on your measurement device to measure pulse width. Pulse-width measurements measure the time between either a rising and a falling edge, or a falling and a rising edge." If you change the Pulse Width Setup Starting Edge setting to Falling edge and look at the picture above, you'll see that the pulse width it's measuring the width from a falling edge to a rising edge (the pulse width while the signal is low). So this measurement will go from the falling edge of your first measurement to the rising edge of your second measurement. If you want to measure the width of the first pulse (while the signal is high) you need to set your Starting Edge to Rising. 
    Do you know whether the width that you want to be measuring is while the pulse is high or while it's low? Starting Edge Rising and Starting Edge Falling should give you different measurements, because they're measuring different things. You should verify which result it is you want, and what it is you're trying to measure. 
    Hope this helps!
    Emily C
    Applications Engineer
    National Instruments

  • Is it possible to display my measurements on my iPad 3?

    is it possible to display my measurement on my iPad3?
    I am having cDAQ 9191 and NI-9234, I would like to see my measurement on my iPad3.
    Q1: do I need to have a MacBook Pro to do this application?
    Q2: do I need to buy extral license to my Labview developer suite?
    Q3: is there a step by step manual for displaying measurement on iPad3?
    Solved!
    Go to Solution.

    Hi,
    Thanks for your support.
    I managed to apply the example, and tried to access my  measurement Data from cDAQ 9191 with NI 9234 as per attached project and vi.
    Please review it and tell me what is wrong. The problem is after  the Web method connects successfully, I have seen the Web Link icon turned green.  But To link my  Poll to the Graph  indicator I should  select the adorner of the variable I want to link but this adorner never appeared this time on the iPad Dashboard.
    Attachments:
    Ihabs 2nd iPad3.zip ‏43 KB

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