How constantly sample meter signal for quadrature linear encoder

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  Just use build a waveform is your decimated table, dt is climbed by the decimation factor and t0 can remain the same.

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  email me if you have problems with thezmobiegroup.com andrewm

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  Original title: problem with Auntie photon more net connection

  How to speed up my signal for Auntie plu photon strength? My net is too slow & very dull.

  Hi shilpadarbar,

  Thank you for writing to Microsoft Communities. From your problem description, I understand that the internet connection is slow. Before you start the troubleshooting steps, I need the required information:

  ·         You get the error message?

  ·         Did you do changes on the computer before the show?

  Follow these methods to the problem of slow internet connectivity.

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  Method 2: Temporarily disable the security software.

  Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do not disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network during the time that your antivirus software is disabled, your computer is vulnerable to attacks.

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• Count the edges of the 2 signals TTL (Heidenhain linear scale)

  Hi all

  This is my first post here. :-)

  Currently, I'm doing a VI to be used with a linear scale. The linear scale gives 2 TTL signals that have an offset of 90 °. The change in distance of the linear scale is given by counting the fronts and edges of the two signals. See the following image: Ua1 is signal 1 and signal 2 Ua2. You can ignore the other signals.

  

  Now, I want to count the 4 edges in order to translate the 2 signals in the distance. This means that I need advanced two counters for Rising-rising, Rising-Falling Falling Falling, falling on the rise for 2 signals. I tried to do 4 points two counters in LabVIEW but that of course does not work, because an acquisition of data can access the card TTL or I did it wrong.

  Once I have to handle this, I also want to understand the meaning.

  My card TTL: NI 9402

  My electronic Heidenhain interface: 100 IBV (http://www.heidenhain.com/fileadmin/pdb/media/img/598_160-23.pdf - also at the origin of the image)

  Hardware configuration: linear scale-> IBV (Elektronic Interface)-> NI 9402-> LabVIEW

  Signals: Analog 3-> 3 TTL-> OR 9402

  I hope I do not double post. Any help would be greatly appreciated.

  I used Heidenhain linear scales in many applications.

  As stated in the previous post, the output of your balance is as a quadrature encoder. Therefore, you must use an entry of the DAQ card counter to measure the position of the scale.

  The desired X 4 mode is done by the meter itself (not possible with some old maps of OR).

  As starting point, see measure angular Position.vi that comes with examples of LabVIEW. On your linear scale, change the type of the polymorphic DAQmx create channel VI CI linear encoder and etiquette of pulses per revolution at a Distance by pulse.

  Feel free to post back if you need further assistance.

• How to demodulate a signal?

  I need to output a low frequency signal (between 2 and 30 Hz) between the output of a sound card at the entrance of another sound card, between two PC. Sound cards is not designed for frequencies below 30 Hz. That's why I need to use the Modulation of frequency or AM, (or PCM) on the outlet side to create a signal, for example, between 102 and 130Hz. How can I accurately demodulate the signal so I can treat it as the original 2 Hz to 30 Hz signal in my journal? I think since DASYLab support the AM, FM and PCM that it would also support the process reverses. How would I do that?

  Although I wasn't able to demodulate the signal, using the FFT, I was able to isolate quickly the frequency since my entry was a pure sinusoidal signal.

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• How to sample multiple sensors in a vital task?

  I need to a thermocouple sensor and voltage sensor in a vital task of the sample. My hardware configuration includes a cDAQ-9172 chassis with a NI9211 TC module and a NI9221 voltage input module.

  I started with the example C code for thermocouple measurement found here:

  Instruments\NI-national DAQ\Examples\DAQmx C\Analog In\Measure Temperature\Cont Thrmcpl samples-Int Clk\ContThrmcplSamps ANSI - IntClk.c

  I then added a few lines of code for the measurement of additional tension.

  The task runs for about 20 seconds, until the buffer overflow with the error 200279.

  I can run task, thermocouple or voltage, indefinitely. It's only when I include them both in the same task as the buffer overflow.

  I have tried many combinations of sampling rate, the size of the buffer and DAQmxRegisterEveryNSamplesEvent nSample size.

  Below is the code I'm running.  Changes to the original file are marked in bold. I've attached a screenshot of the output of command line.

  Can anyone offer a C program example showing how to sample multpile sensors permanently in a task?

  #include 
  #include 
  
  #define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else
  
  int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
  int32 CVICALLBACK DoneCallback(TaskHandle taskHandle, int32 status, void *callbackData);
  
  int main(void)
  {
      int32       error=0;
      TaskHandle  taskHandle=0;
      char        errBuff[2048]={'\0'};
  
      /*********************************************/
      // DAQmx Configure Code
      /*********************************************/
      DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
      DAQmxErrChk (DAQmxCreateAIThrmcplChan(taskHandle,"cDAQ1Mod1/ai0","",0.0,100.0,DAQmx_Val_DegC,DAQmx_Val_K_Type_TC,DAQmx_Val_BuiltIn,25.0,""));
   DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"cDAQ1Mod4/ai0","",DAQmx_Val_Cfg_Default,-60.0,60.0,DAQmx_Val_Volts,NULL));
      DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",1000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));
  
      DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,1000,0,EveryNCallback,NULL));
      DAQmxErrChk (DAQmxRegisterDoneEvent(taskHandle,0,DoneCallback,NULL));
  
      /*********************************************/
      // DAQmx Start Code
      /*********************************************/
      DAQmxErrChk (DAQmxStartTask(taskHandle));
  
      printf("Acquiring samples continuously. Press Enter to interrupt\n");
      getchar();
  
  Error:
      if( DAQmxFailed(error) )
          DAQmxGetExtendedErrorInfo(errBuff,2048);
      if( taskHandle!=0 ) {
          /*********************************************/
          // DAQmx Stop Code
          /*********************************************/
          DAQmxStopTask(taskHandle);
          DAQmxClearTask(taskHandle);
      }
      if( DAQmxFailed(error) )
          printf("DAQmx Error: %s\n",errBuff);
      printf("End of program, press Enter key to quit\n");
      getchar();
      return 0;
  }
  
  int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
  {
      int32       error=0;
      char        errBuff[2048]={'\0'};
      static int  totalRead=0;
      int32       read=0;
      float64     data[1000];
   uInt32 i;
  
      /*********************************************/
      // DAQmx Read Code
      /*********************************************/
      DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,-1,10.0,DAQmx_Val_GroupByScanNumber,data,1000,&read,NULL));
  
      if( read>0 ) {
   for (i = 0 ; i < 2*read ; i++ ) { printf("%.5f\n", data[i]); }
          printf("Acquired %d samples. Total %d\r",read,totalRead+=read);
          fflush(stdout);
      }
  
  Error:
      if( DAQmxFailed(error) ) {
          DAQmxGetExtendedErrorInfo(errBuff,2048);
          /*********************************************/
          // DAQmx Stop Code
          /*********************************************/
          DAQmxStopTask(taskHandle);
          DAQmxClearTask(taskHandle);
          printf("DAQmx Error: %s\n",errBuff);
      }
      return 0;
  }
  
  int32 CVICALLBACK DoneCallback(TaskHandle taskHandle, int32 status, void *callbackData)
  {
      int32   error=0;
      char    errBuff[2048]={'\0'};
  
      // Check to see if an error stopped the task.
      DAQmxErrChk (status);
  
  Error:
      if( DAQmxFailed(error) ) {
          DAQmxGetExtendedErrorInfo(errBuff,2048);
          DAQmxClearTask(taskHandle);
          printf("DAQmx Error: %s\n",errBuff);
      }
      return 0;
  }
  

  One more thing I've noticed is that the size of the data [] has not be increased to include additional channels. Wear in 2000 and also to increase arraySizeInSamps (parameter 5) and 2000 to the DAQmxReadAnalogF64 function call. Given that it was only the value 1000 samples, it will get only 500 samples per channel causing the overflow.

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