Is it possible to measure digital signals with devices of simulations?

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• How to read digital signals with pre-and post-trigger on a card PCI-6251

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• addition of digital signals

  I would like to create a digital waveform as instructions for a stepper motor. The task is to get the motor shaft turn at variable speed within each rotation. I tried to do this by dividing the rotation in a number of blocks that each run at a different speed, thus forming the concatenated rotation profile.

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  The digital I/o on the USB-6008 is a software program only, so unless your signals are rather slow, it probably will not work for you.  In general, the procedure would be to connect each signal to one of the digital lines on the map and then set up a digital entry into LabVIEW task to read the three channels.  If you use a device that has clocked by the digital i/o hardware, you then your input clock signal and use it as the sample for the task clock.  Here is a list of USB devices supporting DIO clocked by the hardware.  Also, there is an example that comes with LabVIEW, which shows how to do this.  You can get to it in LabVIEW by going to help > find examples.  When the example Finder window opens, navigate to hardware input and output > DAQmx > digital measures > Cont read dig Chan-Ext Clk.vi.

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• pulse width of measurement of signals generated by data acquisition

  Finally, I would like to:
  Start a counter pulse width measurement and the analog output at the same instant.
  Stop the measurement with an external digital signal pulse width.

  My current plan is to use a digital output on the acquisition of data to synchronize a digital input and the start-up of the meter input.  The digital input will be a trigger to start for the analog output.  This works, except for the meter.

  While trying to implement this, I tried a simple test to generate a digital pulse with the acquisition of data and wiring for counter inputs.  It does not, even if it seems perfect to an oscilloscope.  Then, without changing the software at all, I connect a function generator to my counter entries, and it measures pulse flawless widths.

  I'm actually implemented it with a Python wrapper around the C DAQmx API, but I recreated in LabVIEW, and it has the same.  VI attached.  I have the latest drivers DAQmx.

  Accidentally, I posted this in a forum for LabVIEW, as I managed to post with the account of a colleague.  I think 2 ups live as this mandate to another post.  I'm sorry.  Former post is http://forums.ni.com/ni/board/message?board.id=170&message.id=389856.

  Solution: I had to set the channel to counter with implicit synchronization.  In addition, the sampsPerChanToAcquire must be at least 2, if not, there is an error.  I still don't understand why it worked with a source of external impulse, however.

  DAQmxCfgImplicitTiming (task_handle, DAQmx_Val_FiniteSamps, 2)

• Acquire 2 digital signal of custom scale (Engg units)

  I am a newbie to the world of DIO.

  I write a VI to acquire 2 digital signals. one of a load cell and others for engine rpm (legumes). I need acquire these two signals and then convert them to engg units using the custom scale and write it in a txt file with timestamp.

  Please suggest the best ways to accomplish this task.

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  DAQG

  Look at the examples on DAQmx in the finder of the example.

  You would not really acquire 2 digital signals.  You would acquire an analog signal of the load cell.  A digital acquisition or against, this is what would make you the acquisition of the motor.  Looking for analog and the counter measures in the finder of the example.  Some of the example should show you how to apply the custom scale.

• Synchronization of analog and digital output with the external sample clock

  Hello

  First of all sorry for my English, I will try to explain what I want to do.

  I want my PCIe-6321 to send two custom signals (modification sawtooths) on a mirror controller. I would also like to generate output with my card at the beginning of each tooth of saw. Everything must be synchronized with an external k-clock signal of 100 kHz. The idea is that whenever the PCI receives a trigger to external clock, it sends two analog output voltages and when he received 1024 clock ticks it will also send a pic of triggering TTL. What I do is first prepare the map and after that in a loop sending and modifing the output values of the two signals and at the same time send a digital signal Boolean in each arch, so when's done it 1024 iterations of the loop I send an event to the digital port. Attached you can see.

  The problem is that I don't know how to synchronize both. Can I use the sample clock just to the analog output? I can use sample for the two outputs clock, or do I need to use the output of the meter? If don't know how to use it here.

  If I do nothing else bad/wrong, I would be grateful for feedback.

  Thanks in advance,
  Pablo

  I don't know how but I find the solution. I'm generating more than a positive value (as I was triggered maybe very fast the oscilloscope has been absent there). If I put the sample clock of digital output to use the sampling/ao/Dev1 clock that it doesn't, but if I put to use the same source as the OD (terminal where my external clock is connected), but the trigger to start the DO to be Dev1/ao/StartTrigger this works. I don't really know why, but it does.

  Thank you for your patience and your help. I put here the final code.

• Measurement of frequency with CompactRio

  Dear all

  I have an anemometer which sends digital signals. I'm trying to analyze the signal to determine the speed of the wind.

  I have one NOR cRio-9024 and NI 9205. When I connect the anemometer, it gives me some positives square rear tension (see attachment). I wonder if I could turn this to the readings of frequency because it is linear to the wind speed.

  I tried to follow the link below, but my module does not have the option of digital Configuration specialist

  http://digital.NI.com/public.nsf/allkb/C9088DFDF803CD8B862575F3007C40FD

  or I should have another module OR who could measure the frequency of the signal directly?

  I would like any ideas or suggestions. Thank you very much!

  LabVIEW Newbie

  
  

• Graph of digital signal using binary numbers.

  I need to generate digital signals 4.
  I have created a binary number which represents the 4 signals. (I don't know if I integrate it properly).

  Issues related to the:

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  2 - is the right way to generate digital signals?

  I need something like this:

  

  Your code is meaningless.

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  Try something like the joint to rotate the pieces...