Distortion of the signal caused by the channels # sampled and sampling frequency

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  Hello

  Follow the troubleshooting methods in the article below and check if this solves the problem.
  Troubleshoot Guide downloading problems in Windows Media Center
  http://Windows.Microsoft.com/en-us/Windows-Vista/troubleshoot-guide-downloading-problems-in-Windows-Media-Center

  I hope this helps.

  Thank you, and in what concerns:
  Shekhar S - Microsoft technical support.

  Visit our Microsoft answers feedback Forum and let us know what you think.
  If this post can help solve your problem, please click the 'Mark as answer' or 'Useful' at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

• The channel numbers and the USB-6259 BNC

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• How to change the DAQmx sampling frequency

  Hello

  I'm trying to: record streaming channels (acceleration 21 and 1 tension) using a DAQmx task, then convert the data to a PDM file. The program files and output to the TDMS file very well. The issue I'm having is that I can't change the sampling frequency. I want to record 500samples/s and I can not get the "real sampling rate" of change of 1651.61samples / s. I am trying to use the clock to do this and I succumbed. I also tried to change the settings of "Timing" in the task without a bit of luck. Here is a screenshot of the .VI I created. I've also attached a copy of the file VI. Any help would be greatly appreciated!

  

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• Cannot set the < 1609 sampling frequency

  Hello

  We have recently upgraded to LV 8.6 and 8.7 DAQmx and then you have problem with the acquisition of data that uses the DAQmx API. For example, we have a module HAVE cDAQ-9172 and 9239. The device can be specified by the user and a typical configuration could be a continuous CQI, one sample at 10 Hz. After the upgrade of the 200279 error "attempt to read samples that are no longer available... crushed" came little after the task was started. It turned out that the property sampleclkrate is not affected by the value that is put in the DAQmx Timing.vi, except if it has been set > 1612,9, if you set 10 100 or 1000 or whatever the sampling frequency will be always 1612,9 when you read in the property of timing.

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  / Henrik

  I see a flaw in your program, you have the hardware timing and calendar in a software loop. The loop is limited by the expectation of the software. (I think it's on purpose for the demonstration).

  I looked at the Manual for the 9239 and page 18 notice that the minimum entry rate is 1613kS/s

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• How to save data quickly to the high sampling frequency

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  Thank you

  The best

  First we will make some corrections to your DAQmx code.  Since you are using continuous sampling, do NOT connect the samples per channel.  Which is actually limiting your buffer.  And there is really no need to define your buffer size either.  It is default to very big, so this isn't a problem as long as you read your data quite often.

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  But, in this case, I say that the producer and the consumer is not even necessary.  Use the DAQmx Configure registration VI.  With this VI, you can tell DAQmx to disseminate all data directly in a PDM file.  You don't have to do anything.  It is by far the best way to save on your DAQ data.

  

• Change the Audio sampling frequency - post audio recording

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• HAVE sampling frequency is divided by the number of channels + 1 for simulated ENET-9213, WLS-9213 and USB-9213

  Hello

  In the code in the example attached, I create a task with a single channel of AI.

  I get the maximum sampling frequency using DAQmxGetDevAIMaxSingleChanRate (or DAQmxGetDevAIMaxMultiChanRate), both return the same value of 1351 s/s.

  When I try to configure the sample calendar using DAQmxCfgSampClkTiming at the maximum sampling frequency clock he does not accept the rate and returns the following error. Note that the error message shows 2 channels, even if only a channel has been added.

  OUTPUT:
  DAQmx error:
  Sampling frequency is greater than the maximum sampling frequency for the number of specified channels.
  Reduce the sampling frequency or the number of channels. The increase in the conversion rate or
  reduce the time of the sample can also mitigate the problem, if you define one of them.
  Number of channels: 2
  Sampling rate: 1.351351e3
  Maximum sampling frequency: 675.675676

  Why the device driver thinks I have 2 channels in the task, when a channel has been added?

  Please find the code to reproduce this problem attached.

  Kind regards

  whemdan

  The MathWorks

  Hello w,

  By default, the ENET/WLS/USB-9213 in NOR-DAQmx module has the AI. AutoZeroMode the value of the DAQmx_Val_EverySample property. This causes NOR-DAQmx acquire the channel of the internal path of the unit (_aignd_vs_aignd) on each sample to return more specific measures, even if the operating temperature of the device moves over time. If you need the sampling frequencies higher than this allows, you can call DAQmxSetAIAutoZeroMode(..., DAQmx_Val_Once) (who acquires the formatting string when you start the task) or DAQmxSetAIAutoZeroMode(..., DAQmx_Val_None) (which disables the setting entirely).

  Note that for measures by thermocouple with cold junction compensation sensor of the 9213 NOR, NOR-DAQmx acquires channel built-in CJC (_cjtemp) on each sample as well, for the same reason.

  Brad

• Formula to find the value of the channel

  Hi all

  Support: Dat file containing the value of time and acceleration. Now, there are only two Channels.  Channel 1 is time. Channel 2's acceleration.

  Step 1: Create more than two channels. Channel 3 and channel 4

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  Step 3: where it has reached 1. XXXXXXXX in the process of accelerating from this point in the channel 3 and 4, paste all the values STD. STD values in the attached excel file.

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  Thanks in advance.

  Hi Rash.patel,

  You didn't yet tell me where to find the Excel file, so I assumed it would be in the same folder as the VBScript script.  I used the DIAdem Excel Import Wizard to create an *.stp file that can be passed as parameter in the ExcelImport() command to load these curves 2 envelopes by program.  I also added a file dialog box, then you can select the *. DAT to deal with file.

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• Import data from txt file and name the channels

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  I want to import data from a file txt (see attachment). Well well, no proplem, but I want to also read the information on the channel names and units and rename the imported channels. Is it possible to do? It is also important that the number of channels may vary.

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  Hello Andreas,

  Thanks for your work. I'll adjust the code.

  Gabriel