HP 54602 B oscilloscope to view 2 channels and save the data to a file

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  I have looked around the previous messages, but can't seem to find what I'm looking for.

  In most of my experience, I've implemented some DAQ and once the modules and channels are all in place, which is where they stay forever.

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  So with every new start of the program, you will have a known device (your strain gauge device), but unknown channels. Here's how I attacked only a few years ago...

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  • Make a constant table of all known possible channels. Say that it is 8 cells and compare that to an array of channels USED, making false tracks off the chains 'Unused' and the names of real channel out of used ones. Under certain conditions to check which ones which is used to remove the appropriate channel and add the DAQmx virtual channels properly. The VI snapshot below goes into the details. I brought not only the channels, channels, such as min/max properties and bridge information. My VI also made bridge removal, under certain conditions, depending on sensor that the user wanted to null (that part is not shown.)

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  Hello

  I'm working on a project for which I have to display the I-Q constellation plot and normalize the data to fit a circle of unit RADIUS.

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• change of scale of a channel running from the DAQmxSetScaleAttribute task

  Hi all

  simple system configuration: AI channel is configured using OR max and also using a scale that is configured in NI Max.

  Once the system is running, the task of the program started and playback of data acquisition, everything's fine. now I want to do is get the value of a string and reading that the DAQmx reads on the channel by chaning the ordinate at the origin of the linear scale at zero. I tried to get the y-intercept value and the actual value of the existing interception and defining the DAQmxSetScaleAttribute with the new linear value and nothing changes on the sudtracting channel. Possible solutions, I tried shutting down and restarting the task but not clearing and reloading of the task.

  I also tried DAQmxSaveScale, but the value in NImax for interception does not change either.

  is it somehting in the order of calls which must happen, or I can even change the scale on a task without compensation or recharge it the task?

  OK, that's how I got it working again noted that the system is configured using NImax and all the channels to HAVE are in a single task, also an important feature is that I use the DAQmxRegisterEveryNSamplesEvent function. each channel also has its own scale.

  First you need to find is the next shift, you need to recalcualte the max and min to the beach of this channel and save everthing.

  DAQmxGetScaleAttribute ("1Dist", DAQmx_Scale_Lin_YIntercept, & readOffset);  \\get the existing scale value
  stopDAQ();
  GetCtrlAttribute (panelManual, MANUAL_1POS, ATTR_CTRL_VAL, & actualReading);   \\reading off the coast of data acquisition
  newOffset = (actualReading + readOffset) *-1;                                                                     offset \\calcualte
  ERR is DAQmxGetChanAttribute (gDAQTaskHandleAI, "1_Unit_Ext_Pos", DAQmx_AI_Max, & max, NULL);.   cahnnel \\get NIMAX Info
  ERR is DAQmxGetChanAttribute (gDAQTaskHandleAI, "1_Unit_Ext_Pos", DAQmx_AI_Min, & min, NULL);.      cahnnel \\get NIMAX Info
  newMax = max + newOffset;
  Max = newMax;                  ------It will be ediedited what I did was made max an int to get rid of the decimal points
  newMin = min + newOffset;
  min = newMin;                   ------It will be ediedited what I did was made max an int to get rid of the decimal points
              
  DAQmxClearTask (gDAQTaskHandleAI);                                 \\clear the task due to the attached DAQmxRegisterEveryNSamplesEvent will thow errors because it is attached to the task
  DAQmxLoadTask (DAQMX_TASK_TITLE_AI & gDAQTaskHandleAI);
              
  ERR = DAQmxSetScaleAttribute ("1_Act_Ext_Dist", DAQmx_Scale_Lin_YIntercept, newOffset);
  ERR = DAQmxSaveScale ("1_Act_Ext_Dist", "1_Act_Ext_Dist", "", DAQmx_Val_Save_Overwrite |) DAQmx_Val_Save_AllowInteractiveEditing | DAQmx_Val_Save_AllowInteractiveDeletion);
  ERR = DAQmxSetChanAttribute (gDAQTaskHandleAI, "1_Unit_Ext_Pos", DAQmx_AI_Max, max, NULL);
  ERR = DAQmxSetChanAttribute (gDAQTaskHandleAI, "1_Unit_Ext_Pos", DAQmx_AI_Min, min, NULL);
          
  ERR = DAQmxSaveTask (gDAQTaskHandleAI, DAQMX_TASK_TITLE_AI, ' ',)
  DAQmx_Val_Save_Overwrite | DAQmx_Val_Save_AllowInteractiveEditing | DAQmx_Val_Save_AllowInteractiveDeletion);
  DAQmxClearTask (gDAQTaskHandleAI);
  DAQmxLoadTask (DAQMX_TASK_TITLE_AI & gDAQTaskHandleAI);
  GetCtrlAttribute (panelDAQ, DAQ_PANEL_SampPerChannel, ATTR_CTRL_VAL, & sampsPerChan);

  DAQmxRegisterEveryNSamplesEvent(gDAQTaskHandleAI,DAQmx_Val_Acquired_Into_Buffer,sampsPerChan,0,EveryNSamplesCallback,);

  startDAQ();