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• separation of two edges using a digital output

  I am using a DAQ, PXI-6229 map and programming in c# .net.

  I'm claiming a falling edge on PFI12 used as a digital output, and I need to measure the time between this edge and a second front on PFI8 used as a digital input.  I have implemented the code using some examples I found.  I don't know when to to argue the signal on PFI12 in order to be read at the right time.  Playback must be put in place before the signal is asserted, but I do not know how to set it up it up properly.

  Here is the code I have so far:

  Public Sub MeasureAcquisitionTime()
  {
  DigitalSingleInputTask = new Task();
  CIChannel counterSetup;
  firstEdge = CITwoEdgeSeparationFirstEdge.Falling;
  secondEdge = CITwoEdgeSeparationSecondEdge.Rising;
  Double minTime = 10-3;
  Double maxTime = 60F-3;
  String auxCounterInput = "/" + CardName + ' / PFI12 ';
  String gateCounterInput = "/" + CardName + ' / PFI8 ';
              
  counterSetup = DigitalSingleInputTask.CIChannels.CreateTwoEdgeSeparationChannel)
  CardName + ' / ctr1 ', 'counter',
  minTime,
  maxTime,
  firstEdge, secondEdge, CITwoEdgeSeparationUnits.Seconds);
  counterSetup.TwoEdgeSeparationFirstTerminal = auxCounterInput;
  counterSetup.TwoEdgeSeparationSecondTerminal = gateCounterInput;
  DigitalSingleInputTask.Control (TaskAction.Verify);
  runningDigitalTask = DigitalSingleInputTask;
  counterInReader = new CounterReader (DigitalSingleInputTask.Stream);
  Double data = counterInReader.ReadSingleSampleDouble ();
  }

  I'm glad to hear it.

  paofthree wrote:

  Is there a way to make a measure of separation of two edges on the analog inputs of the PXI-6229?

  The only way would be to constantly acquire the analog input voltage and calculate the separation of the two edges in the software.

  Best regards

• Pulse or measure of separation of two edge with implicit synchronization in ticks: what about minVal and maxVal?

  When I pulse or measure of separation of two edges, using the implicit synchronization, DAQmx chooses (I think) an internal time base appropriate for the measurement. My X series on Board (a 6320) has for example a time base internal 100 MHz. I think I can apply to the use of a base of specific time (using the Set accessor of property DAQmxSetCICtrTimebaseSrc to set the counter to the value '100MHzTimebase' time base). But the docs of the DAQmxCreateCIPulseChanTicks and DAQmxCreateCITwoEdgeSepChan functions (this last one called with the parameter to the DAQmx_Val_Ticks units) make me spend a minVal and maxVal. Apparently, these values are used to determine a time appropriate for the implied timing base (internally). But how to choose the specific digraph/maxVal values? They are obviously dependent on the time base, so it's kind of a situation / the hen's egg. Should I just say '1' or '0.1' or even '0 '? Because I * want * the time of 100 MHz, to use base. Or can I simply call the DAQmxSetCICtrTimebaseSrc after DAQmxCreateCIPulseChanTicks?

  1. When you use "Ticks" for units, digraph must be > = 2.  DAQmx does not support measures of 0 or 1 "Tick" of a time value.

  In general, the parameters that minVal and maxVal are mainly useful for people who are measured in scientific units such as seconds.  They allow DAQmx do the dirty work of correlation required range of programming interface with the basics of time available to the Agency and to make a judicious selection automatically.  For people like you measure in ticks, DAQmx won't do the thinking for you anyway, so just give them plausible values.

  2. Thus, maxVal must simply be a valid 32-bit integer.

  3. Yes, you can explicitly configure to use the time base of 100 MHz after the creation of the task, no doubt thanks to the function, you said "DAQmxSetCICtrTimebaseSrc".  (I do my programming in LabVIEW and don't know the syntax of the api code text driver.)

  I believe that if you do not explicitly choose a time base for a task using ticks as units, the Council will use its default time base.  I know there is an api function in LabVIEW to interrogate the database after creating a task, perhaps you have an available too?

  -Kevin P

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• source timebase external meter in the task of separation of two edges

  Hi all

  I use a Board OR 6220 and want to make something very similar to what is described in the knowledge base article "how I count Digital edges between Start and Stop relaxing on a NI 6602 Council of counters/timers?

  Anyone know how I change the example program "TwoEdgeSep.c" do not use the internal time base but to use an external source (that I want to count the edges?)

  Thank you for for your time.

  ULI

  Hi Uli,

  You must add a call to DAQmxSetCICtrTimebaseSrc before starts the task to configure the hardware to use an external time base.  You also probably want to change the DAQmx_Val_Seconds
  DAQmx_Val_Ticks parameter in
  the DAQmxCreateCITwoEdgeSepChan
  function assuming you want your result measured in terms of the external clock ticks.

  Best regards

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