Different output meter with a different number of samples

Similar Questions

• Triggers of analog input output meter with delay

  Hello!

  I am currently using a PCI-6251 DAQ card with a block of connection BNC-2120.  I have a VI (one that is attached to this topic) that will essentially be an analog input signal and produce digital impulses from the output of the meter to each instant trigger.  I am also able to define a series of delay values such that the delay will update automatically each at intervals specified by the user or when you press the stop button.  I wonder if there is anyway to change this program as the time-out value will change every instant release.  So, for example, in the first trigger a pulse is produced 0 second delay, then immediately when the next instant relaxation is reached, a push will occur with a 0.1 second delay, etc...  And I want that the series of the time-out values to keep looping.  I tried to use my current VI, with time to stop at each iteration to be less than half of the period, so theoretically it should go to the next delay value in the next instant trigger.  Then I tried to put a certain time-loop around it to keep the job going, but it doesn't seem to work.  I've attached a screenshot of my attempt, please let me know if this is possible, thank you!  To see what each part of the VI in the screenshot, please see the screws attached, thank you!

  P.S. for the VI that is attached, the analog input signal is 281Hz, the pulse width is 2.5% of the period and the delay is in the stages of T/20.

  

  No worries,

  Please see the attached block diagram image.  It is important to wire terminal on the Read.VI DAQmx acquire in a constant to the number ofsamples.  This will force this function to wait until many samples are available in the buffer.  In my example, you will get 1000 samples per second (because my rate is 1 kHz).  and these 1000 were submitted directly to the FFT.  What happened for example of you, it is only because you have not specified the number of samples to read, it is by default (-1), which means that the DAQmx Read.vi will pull all the data that is available in the buffer at the time.  So if you had only 2 samples in the buffer that your FFT will have only two samples on average and as a result it will fail. Try this and it should help!

  

• Producer-consumer - acquire and analyze different number of samples

  Hello

  I do some application which allows to acquire data with DAQmx with sample rate 50000 samples/s loops producer-consumer.

  In the loop of the producer I have DAQmx Read function that reads 2500 samples in each loop literation. I send these data to the loop of consumers through queues.

  The consumer loop I need to analyze the data, but to do what I need a second data part od (50000 samples). Unfortunately the queue gives only 2500 samples in a loop of producer literation, and the next literation queue fills with another 2500 samples.

  I want to read only 2500 samples of data acquisition, because in the loop of the producer I graph which shows me real signal acquisition, and I have a quick refresh of graph (50000/2500 = 20 times per second). But in the loop of consumer I need of 50000 samples to analyze. I can't lose all the data, everything must be analyzed.

  What should I do?

  Concerning

  Kacper

  Do not stop the loop based on 50 000 samples.  Only stop it when the program is supposed to stop.

  Use a case structure in the loop based on the question if the 50 000 samples were acquired to determine whether to add to the table, or add the new information to the table and remove the oldest data in the table.

• 6602 synchronized with a different number of pulses per channel pulse generation

  Hello

  I try to use counters NI 6602 to generate 4 pulse trains that begin together but then proceed with each counter producing its own number of pulses (over mode) with its own frequency.

  It seems that each of the 4 channels of wiring at the same special teams each channel to produce the same number of pulses based, apparently, on which channel was recently with the specified NumPulses value so that it is the (implicit) VI DAQMx Timing.

  I tried to use separate tasks for each channel, but it seems that the there is much more uncertainty in the initial start of the train of impulses on each channel: unique task ~ 13us (coherent) delay between channels, a task for each channel (variable)... Although I'm not entirely confident in these temporal measures (estimates of the oscilloscope) +-15us. So it seems I'm sacrificing some synchronization to produce a different number of impulses for each channel?

  Is it true, or is there another way to match the beginning of the independent pulse trains.

  Vadim

  You should be able to synchronize the start of 4 separate meter output tasks by having all the

  looking for a common startup trigger signal.  You can easily do yourself the trigger signal on

  (for example) PFI_0 using a digital task rocking DIO_0.

  -Kevin P

• 'For' loop with a different number of iterations. Second, the auto-indexation of the tables with different sizes is done. It can affect the performance of the Vi?

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  Thank you very much.

  My first thought is that the compiler to the LabVIEW actually removes the Matlab node because the outputs are not used.  Once you son upward, LabVIEW must then call Matlab and wait for it to run.  I know from experience, the call of Matlab to run the script is SLOW.  I also recommend to do the math in native LabVIEW.

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• Buffer the output AO, refresh rate is different from the sample clock frequency

  Hello

  I am an AO output in the buffer using a single channel. I have a stamp with a ripple of 200000 points with a triangular waves of a 1000pts each repeated 200 times. If I want a frequency of 1 Hz, I simply update this waveform 1000pts and if I wanted to 5 Hz, then 5000pts and so on. But there is some frequency that I won't be able to use like the refresh rate (the number of samples that I ask to update) is different from the sample clock frequency, which makes synchronization with the other difficult to trigger (incomplete cycle).  Frequency 3 Hz (update 3000pts), as (update 7000pts) 7, 6 Hz (update 6000pts), 9 (update 9000pts)... 11Hz at 15 Hz and is not valid in the sense that the refresh rate is different from the sample clock frequency. That makes a whole lot of inaccessible CONFIGURED!  Can someone tell me what determines the banned frequency?  Is this something to do with the material?

  concerning

  One thing you can try is to change the number of samples per cycle. This cannot give the precise frequency accurately, but can reduce the average error.

  120 Hz, the error is currently about 400 parts per million (ppm). The accuracy of the time base is 50 ppm, then this error is less than 10 times the inherent error due to the time base.

  Consider this configuration: the closest nominal sampling you rate, you can get is 120048 Hz (1000 samples per cycle at 120 Hz). If your buffer contains 1200 samples per cycle, 100 copies of it would produce 1 second of data to 120,048 Hz. But if the buffer contained an average of 1200,48 useful Samper by cycle, you get the exact frequency.  Of course getting 0.48 of a sample is delicate. But the kind of feasible. If you use 48 cycles in the 1201 samples per cycle and the cycles of 52 to 1,200 samples per cycle, the total number of samples per second = 120048. Average frequency will be exactly what you want. Instantly, the frequency is slightly higher or lower than the exact value.  By an alternation of 1200, 1201, 1200, 1201... 1201, 1200 100 cycles that the Jig is fast.  If you group all 1200s whole and all 1201 s frequency hopping may be more sensitive.  If this kind of jitter is acceptable depends strongly on what you do with the release.

  This technique is used in some systems of frequency synthesizer.

  Lynn

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• Definition of different number of REB for each key

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  Assuming I have the following tables and sample data:

  create table test_tbl_aa
  (aa number(2));
  
  insert all into test_tbl_aa(aa) values(aa)
  select level aa
     from dual
     connect by level<=4;
     
  create table test_tbl_aa_n
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  insert all into test_tbl_aa_n(aa, n)
    select aa, lv
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      cross join (select level lv
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  AA    N
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  1     2
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  3     1
  3     2
  4     1
  4     2
  

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  AA    N
  --------
  1     1
  1     2
  2     1
  3     1
  4     1
  4     2
  

  Note: Oracle db 11g. v2

  Thank you very much

  SIM

  Do you mean like this?

  SQL > insert while test_tbl_aa_n (aa, n)
  2 Select aa, level
  test_tbl_aa 3
  4. connect by level<=>
  5 and aa = aa prior
  sys_guid() 6 and prior is not null
  7.

  6 rows created.

  SQL > select * from test_tbl_aa_n;
  AA N
  ---------- ----------
  1          1
  1          2
  2          1
  2          2
  3          1
  4          1

  6 selected lines.