How to change the frequency of sampling DAQmx during execution?

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  I have a question and hope you can help me!

  I created a session of multtrack with 2 tracks. How can I change the frequency of them? I mean each track has a frequency of differrent and I use hearing CS6.

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  Thank you very much!

  If by frequency you mean sampling frequency so you can edit the audio file by double-clicking on the item in the multitrack and then right click once you are in the edit mode and select 'convert sample type"and you can change to say 48 k say 44.1 k or something else.

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  I have a vi that:

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  I used a flat sequence to query each sensor.  I am trying to find a way to modify this vi in order to increase the frequency of sampling on the sensors.  Currently, it takes 2000ms for question 4 sensors and write tot the measures file.  Anyone have any ideas on how to speed up by programming?  I am concsidering on the purchase of a device USB DAQ (USB6000) and rewriting of the vi.  I was wondering if there was some tweek I caould make on the vi.

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  I meant put the time-out on the line, then the reading will be either timeout after 200ms or read the 2 bytes.  Whichever is faster.  Then deletes this 200ms waiting you.  I have attached your vi to show you what I wanted.  I did not notice that it is a hardware or wither then you might want to look in the data acquisition functions.  It will clean up your code and are very easy to use.

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  I'm trying to measure the frequency using the NI DAQmx task and then convert it to a RPM if possible.

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  The Manual recommends a minimum frequency of at least 15 Hz for setting low range. This card is not really designed to measure the frequency for a single pulse over a long period of time.

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• How to measure the frequency of sampling (s/s) in LabView FPGA?

  Hello

  I am trying to find a way to measure the sampling frequency (s/s) during which I read from analog input in LabVIEW FPGA. I know that the sampling frequency is specified in the data sheet of the module HAVE, but I want to measure in LabVIEW.

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  A screenshot of the example code would be greatly appreciated

  Hey phg,.

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• How to lock the frequency of sampling for 5673 and 5663

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• Change the frequency AO AO DC voltage scanning scan?

  Hi all

  I am very new to labview, but find the forums and examples extremely helpful. I probably spend 50 + hours to familiarize myself with tutorials and general information, but I am at a point where I need your help.

  I'm unable to change the example "AO frequency sweep" found here (see custom_sweep_1.VI) to allow me to sweep the voltage.  My instinct is that I don't need of the ' waveform buffer generation VI ' and that I should be able to remove the associated entries since I'm only interested in a sweep of DC voltage. It is also called create_log_frequencies.VI, and I'm fairly certain that I can use it as written and simply change "frequency", "tension". My work of the custom_sweep_1 changes are attached as custom_sweep_Voltage.

  The problems I am having with the edition of custom_sweep_1 are:

  (1) I don't think I understand very well how or if the parameters associated with waveform buffer generation VI relate to a sweep of DC voltage.

  (2) an extension of 1): the loop depends on the samples and Cycles by buffer and I don't know how / whether to replace these values

  (3) the .VI DAQmx Timing (sample clock) receives its sampling frequency of output waveform buffer generation VI, but I think I can use 1/scan time to replace this (?)

  (4) the DAQmx Write.VI gets waveform buffer generation data, but if I can get around this VI and AO tension of wire directly to write DAQmx then I think I can use minimum voltage as my entry of data (?)

  (5) after the implementation of these changes, the custom_sweep_Voltage runs, but I get error 200609:

  "The possible reasons:

  Generation cannot be started because the size of the selected buffer is too small.

  Increase the size of the buffer.

  Choose the size of the buffer: 1
  Minimum required buffer size: 2

  "Task name: _unnamedTask<3A>"

  I also note that I tried other ways to create the sweep of voltage DC VI:

  (1) I have tried change the tracer IV example (found here), but it's much more confused than change the frequency sweep.

  ( This tutorial and sample 2) block diagram looks like straighforward, and I also work on understanding what Assistants DAQ 1,2, 3.

  Any return would be great. I think it is clear that at the very least, my poor understanding of 'buffer' is if the cause of my confusion about the change of frequency scan, please do not hesitate to share any information you have.

  Thank you very much for the help,

  -Esperanza

  Additional information on my project/progress using labview follows below:

  My final goal is to determine whether or not the resistivity of a sample of organic driver changes over time. For this I want to compose a VI simultaneously sweeping the output voltage DC-5 to 5V periodically during 24 hours and measure the voltage drops to my load resistance (to determine the current in the circuit) and the sample. I use a USB 6259 DAQmx and that you have correctly configured my circuit. I work two screws that I created with the DAQ assistant and by changing some of the examples, I found online. Output voltage (of an AO) but I have to manually select the voltage value. The second reads voltages in three samples of interest and writes the data to a PDM file. If you've read this extreme sensation and still make a contribution, my next goal after finding how to sweep the voltage is to combine this with my VI measure VI. I think it will be relatively simple, but still, I rejoice in all your comments!

  I solved this problem. I have changed my approach to be similar to the last link in my post. AO frequency scan approach is much more complicated that I need. Thanks for the help.

  -Esperanza

• DAQ Assistant don't update the buffer size to change the frequency

  Hi all

  I use DAQ Assistant inside a loop to write a signal in a module output best 9262 OR a cDAQ-9174.  I generate the signal with the express vi simulate Signal or with a simple loop using indexing.  The problem is that when I change the frequency, using the same sampling frequency, I have a different number of samples to write the cDAQ does not seem to update the size of the buffer, so no my signal gets written in.  The result is the first sine wave is nicely written, but each after that gradually get cut off on the edges.  I traced imput signal that I generate, so I know that it is generated with the right size and frequency of departure, what ever it is, still works, it is those more later in the loop who have the wrong size aparently buffer.  I tried to reset the cDAQ by adding a different DAQ Assistant at the end of the outer loop with the stop bit the true value, it makes me just the error "resource not available.

  Any ideas?

  I'm using LabVIEW Base development system new V12.0 32 bit.

  Thank you

  Matt

  Idea:

  Get rid of the DAQ assistant and use the DAQmx API.  The DAQ Assistant is there to support the limited functionality and base up a dirty experience and running quickly.  The report of the API offers more funcionallity and DAQmx property nodes allow greater flexibility.  DAQ Assistant is just too limited for your needs.  (you can't paint a masterpiece with crayons)

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  Could someone help me in Labview? I got a result as shown in Figure 1. However, I want the graph to resemble Figure 2 that we can define the range of frequencies for each channel in the y-axis and maintain the amplitude for the x axis.

  How to change the chart?

  Figure 1

  

  Figure 2

  I have the range of frequencies for each channel, which are:

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Channel	Frequencies
  Channel 1	2401-2423
  Channel 2	2404-2428
  Channel 3	2411-2433
  Channel 4	2416-2438
  Channel 5	2421-2443
  Channel 6	2426-2448
  Channel 7	2431-2453
  Channel 8	2436-2458
  Channel 9	2441-2463
  Channel 10	2446-2468
  Channel 11	2451-2473

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