Acquire 2 digital signal of custom scale (Engg units)

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  I have the card PCI-6120 and Labview 7.1.

  I have a digital signal of the encoder. Am interested in buying an analog voltage on each rising edge of the digital signal. In addition, I have another digital signal (index) between which I wish to make the acquisition.

  I tried several options. But I can't get on the digital dashboard via the hardware. Please help urgently. Alternative, I migrated to the acquisitions acquisition high speed analog and two digital channels and deteting change in software programming and then find the analog voltage. Which is heavy and inefficient.

  Kindly guide correct programming technique.

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  Marie-Hélène

  Hi, Maud.

  Thanks for the update and I hope that your well today.

  Sorry for the delay but it was the Easter holidays!

  Thank you for your congratulations.

  I put your sampling frequency at the maximum rate of the clock source (encoder). The DAQmx driver uses the sampling frequency (and the number of samples per channel) information to perform various calculations and set sizes for the buffer.

  If you set it too high, nothing will happen-guests still just on each edge of the unit receive. If you set it too low, your stamp could be too small and you may lose data.

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• DAQmx custom scale: How do you define minimum and MAXIMUM values?

  Hello everyone,

  I am currently using LabVIEW 2010 and meet the following problem with DAQmx custom scale: first, I created a custom linear scale (ordered originally = 0, slope = 50) and then a string that uses this scale. The real signal acquired from a NOR-9205 (module I) is in the order of-8 / + 8 Volts; When I try to read the measurement of the chain, it seems saturated.

  I discovered that the change HAVE. Max and the AI. Min by a DAQmx channel property node I can improve the situation, but the fact is: I was not able to define a range of-1000 / + 1000 for instance because it exceeds the maximum allowed, and I get an error!

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  No one knows how to fix?

  It seems not to be any possibility of having a large scale factor! If I want to convert 1V 1000V I will never reach it!

  Thank you much for the help.

  B.

  Hello

  The custom scale will be the function that converts the voltage to some units, you can.  If you use a linear scale, it is in the form:

  Data units user = m * wine + b

  where m is the slope and b is the intercept at the origin wine is what happens to the analog input channel.

  The MIN and MAX define you are the min and min AFTER the scaling.  So if you want 1 volt in Ain channel to appear as 1000 in the code, you:

  m = 1000, b = 0

  Then your MAX and MIN is limited to-10000 and 10000 when DID channel lies between +-10V.  By selecting a MAX or MIN outside this range will cause an error and numbers read apart from this will be so much saturation.

  9205 a selectable ranges: ±200 mV, ± 1, ± 5 and ±10 V programmable input ranges.   I haven't used the 9205 so I don't know if this range is automatically selected or the user defined in the module preferences.   Whatever it is, it will have a possible effect that MAX and MIN are.

  For example.

  If you did what you said and used slope = 50 and intercept = 0 AND you got the system set to ±10 volts, while the MAXIMUM and minimum that you can set are limited to ±50 * 10 = ±500.   So if you try to put a maximum of 1000 in there, you will get an error because it needs to be at + 500 to-500.   Your saturation occur at ±10 volts (what is scale ±500)

  If the interval is set to +-1 volt, your MAX and MIN should be within-50 to + 50.  All values apart from this will produce errors.  and if you try to read voltages above + 1 volt (+-50 scaling), there will be saturation.

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• How can I check the voltage values on the acquisition of data with a data acquisition assistant and the custom scale?

  I use a custom scale and the DAQ assistant to acquire data from a USB DAQ device.  How can I display voltage gross values at the same time?

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• custom scales

  Is there a way to get custom scales that appear in my Explorer in MAX?

  Thank you

  Steve

  Hi, SCD,.

  The functionality of adding a scale existing DAQmx (maximally) to a project (and vice versa) has not yet been transposed. There is a proposal for a project, so that this feature will be added in the future. If all goes well, it will be as simple as drag / move, in addition to programmatically add the scales by reference VI or something similar.

  In the meantime, there are some workaround solutions, depending on your current situation. If you already have all your ranges able & Automation Explorer (MAX), you can export (file > export) scales only and then import them into the project. I suggest you create your ranges in MAX first that will allow you to do.

  You can find a VI 'DAQmx save Scale' under this palette:
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  After you have created your scale in LV, call this VI and it will record it as a "persistent scale" in MAX.

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