A voltage divider will be enough to read a 28V pulse in NOR-6251 digital input ports?

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• USB-6210 voltage divider Calibration questions

  I'm trying to calibrate 14 tensions that I read from a voltage divider in 14 channels of a device USB-6210. Attached is an Excel spreadsheet of data I'm trying to understand. On the bottom of the sheet, I applied the same voltage to all channels and draw the raw tension for all channels and the differences between the expected voltage and voltage of raw. I find that these differences are not constant but linear I do not understand. I then use the basic linear function to find the factors in the top of the worksheet. Therefore, in the upper part, I read the input voltage by using a probe high voltage and voltage of Labview which has been adapted by the linear function of base in the background.  Most of the multiplying factors are ~ 1000 as expected, but the tensions for the last 4 channels are significantly different and are not linear for the last two channels. I mounted the two worst voltage channels with polynomial which is ok but not make any sense. Does make sense to anyone. I'm using Labview 9.0.1 and Windows 7. I ran Diagnostic Utility for the acquisition of data on the device and it passed all tests. I looked into the issue of ghosting, but the criteria seem not valid here because of tension in the neighbouring country of the channels is small. I also enclose the VI that supports voltages raw to show how these functions are used. According to me, the results are stable and precise, but I can't explain the above mentioned discrepancies.

  The problem was solved by changing the sampling frequency in the DAQ assistant. I think the default frequency is 1 kHz and I had given up to 750 Hz. By lowering the frequency 150 Hz, the capacitor is allowed time to discharge so that no ghost image occurs. In summary, the question always was ghosting and solve the I: question

  -Removed in the wizard DAQ, channels that have been disconnected and therefore not used.

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• How do you install resistances for channels 8-31 voltage divider in scb - 68?

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  Have the you wired as an attachment?  Using my schema, you can calculate the current flowing through the pot based on the fall of the tension in the pot

  4V / 10Kohm = 0.0004

  Kirchhoff's current law, we know that the same current flows through the circuit so now we can calculate the leg below the wall, based on the current and the fall of desired voltage across the resistance

  1V / 0.0004 A = 2.5 K Ohm

  My scheme maintains the current flowing through the circuit of constant, so the voltage divider must never change.  Assuming a linear pot, you will get a swing of such linear voltage as measured at the wiper.  If you wired the pot, a different way, then more then likely, you change the total resistance of 5V ground that would have the common effect that would effect the tensions.

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  Your question is more advanced is usually asked to Microsoft Community.

  Try an appropriate MSDN forum:

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• out of meter can be fed in a simple voltage divider?

  I managed to install this labview program: http://www.ni.com/white-paper/2991/en

  and I know it works because I see a pulse when connecting to the Terminal counter on the BNC-2110 block train on the oscilloscope.

  I use a DAQ 6259 pci-e card.

  I noticed the amplitude of the signal is about 5V, but I need it to be approximately 3V.  Then I fed the pulse train in a circuit voltage divider simple that looks like:

  

  Above v1 is actually the PWM signal from the counter of the BNC-2110 block Terminal.  However, when I measure the amplitude on the oscilloscope, it's always as 5V (or perhaps 4.9).

  Am I missing something big here?

  Hi invasion2121,

  There should be no problem with dividing the output voltage of your meter.  Your photo has been cut off slightly in head - are survey you the voltage falls through R7 where you see 4, 9-5 V?  That means the voltage on the rest of the circuit looks like?  The output of the counter provide more than 5 V output to the Earth, so if A7 is down more than that, then your voltage on R1 and R2 should be almost 0.

  What is the impedance of your reach?  This can have an effect on your measure, but not as you describe.

  Kind regards

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• How can I set up a digital input task to read continuous samples?

  I am trying to create an exclusively digital task that will make digital readings at a rate timed by the material using a PCIe-6509. However, when I try to put the task timing as follows (which works on a PCIe-6509), I get the following error:

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  Property: NationalInstruments.DAQmx.Timing.SampleTimingType

  Required value: NationalInstruments.DAQmx.SampleTimingType.SampleClock

  Possible values: NationalInstruments.DAQmx.SampleTimingType.OnDemand, NationalInstruments.DAQmx.SampleTimingType.ChangeDetection

  Task name: DigitalInputTask

  State code:-200077

  The relevant parts of my code are:

      public class DigitalInputReader: IDisposable
      {    
          public DigitalInputReader()
  
          {
  
              dataReadyHandler = new System.AsyncCallback (DataReadyEventHandler);
  
  daqmxTask = new DigitalInputTask();
  
              daqmxTask.Configure (Globals.NI);
  daqmxTask.Control (TaskAction.Verify);
  
              daqmxTask.Control (TaskAction.Commit);
  daqmxReader = new DigitalMultiChannelReader (daqmxTask.Stream);
  
          }
  public class DigitalInputTask: task
  
          {
  public DigitalInputTask(): {base ("DigitalInputTask")}
  public virtual void Configure (NiConfiguration niConfig)
  
          {
  
              <= niconfig.digitalinputs.count="" -="" 1;="">
  
              {
  
                  String physicalChannelName = niConfig.Device + "/ port" + niConfig.DigitalInputs [i]. Port.ToString () + "/ line" + niConfig.DigitalInputs [i]. Channel.ToString ();
  
                  String nameToAssignToChannel = niConfig.DigitalInputs [i]. Name;
  DIChannel ch is this. DIChannels.CreateChannel (physicalChannelName, nameToAssignToChannel, ChannelLineGrouping.OneChannelForEachLine);
  
                  c. InvertLines = niConfig.DigitalInputs [i]. InvertLines;
  
              }
  
              var signalSource = "";
  
              This. Timing.ConfigureSampleClock (signalSource, Globals.MachineSettings.SampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples);// Globals.MachineSettings.SamplesPerChannel);
  
          }
  
      }

  The last call to Task.Timing.ConfigureSampleClock, it's which throw errors.

  Of the options available, or SampleTimingType.OnDemand or NationalInstruments.DAQmx.SampleTimingType.ChangeDetection provide the same precisely timed calls that I am familiar with the analog input interruptions.

  How is it possible in a digital task?  I mean, it seems that I could set up another task to do call by material for the production of a clock signal and use the ChangeDetection synchronization mode, but this seems a bit complicated for what should be easy to do.  What Miss me?

  Update: I thought about it.  You cannot call ConfigureSampleClock when the digital input card is a device of 650 x, because these devices have any automated examples of clock.  They are configured to run in mode default finite samples.  You must make all sample synchronizing with these devices in the software.

  Be cautious, however, because the .NET timers ensure they put any faster than their scheduled interval.  In practice, they are usually 5 to 10 ms slow by tick.  This means that if you want to read samples every 100 ms by sample clock, you'd end up reading all 108 ms samples.  All counters based on the elapsed time and number of samples would be away after a few seconds of it.

  Instead, you must do one of four things: write a doggone driver that runs in ring 0 and interfaces with the PCIe card in the required interval (i.e. on NC, not you, in practice), tolerate the inclination of the clock, use a multimedia timer as an interruption audio or video that is more likely to respond to the correct interval, or , my solution, an accurate clock allows you to set the interval of the timer.  I wrote the following code to the timer:

  var CorrectiveStopwatch = new System.Diagnostics.Stopwatch();
  
  var CorrectedTimer = new System.Timers.Timer()
  
  {

  
  Interval = targetInterval,
  AutoReset = true,
  };
  CorrectedTimer.Elapsed += (o, e) =>
  {
  var actualMilliseconds =;

  Adjust the next tick so that it's accurate
  EG: Stopwatch says we're at 2015 ms, we should be at 2000 ms
  2000 + 100 - 2015 = 85 and should trigger at the right time
  var StopwatchCorrectedElapsedMilliseconds = newInterval +.
  targetInterval-
  CorrectiveStopwatch.ElapsedMilliseconds;

  If we're over 1 target interval too slow, trigger ASAP!
  <=>
  {
  NvelIntervalle = 1;
  }

  CorrectedTimer.Interval = NvelIntervalle;

  StopwatchCorrectedElapsedMilliseconds += targetInterval;
  };

  I hope this helps someone.

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