Use of niScope.lib in VS2015

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  This is the sub VI:

  

  In my case, PXI-5105 and 6368 are used for the acquisition of synchronization. Post_trig_event and pre_trig_event of data are needed to analyze what analog channel has abnormal evolution. The trig source is not unique, which include several analogue channels. I therefore prefer to use a software to process a lot of data to channel to find the abnormal change and then send a trig signal, which means a trig signal to the PFI or the PXI_Trig. I think that the noScope that send software Trigger Edge works. Can you give me an example of this subroutine VI?

  I've attached an example that uses a software trigger to trigger an acquisition.  The code shows how to use the "niScope Trigger.vi software Send."

  Description of your request, it looks like you want to acquire data continuously and perform a top treatment in LabVIEW to determine when send software trigger.  This can also be done, and I would recommend starting with one of our continuous streaming of examples, like "niScope EX Fetch Forever.vi", which can be found using the example Locator OR under material input and output > Modular Instruments > NOR-SCOPE > Acquisition continues

   

  
  I hope this helps!

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• When to compensate for and win on a PXI-5122 niScope change?

  In my application, I use the niScope VI Fetch (I16 2D) to extract a multi-record, multichannel on a PXI-5122 digitizer acquisition.  Trying to optimize my code, this has led me to this question.

  I am taking 32 successive acquisitions and adding (on average) all waveforms.  According to the notice in the scale and standardization of binary data, I first apply the parameter wfminfo.gain to data I16, sum which, then apply the offset.  MATLAB-like pseudocode for my Labview code, it is something like:

  sum = zeros (1,1000)
  
  offsetsum = 0
  
  for i = 01:32
  
      [wfminfo, samples_i16] is niscope_fetch_i16 (...);
  
      samples_float = wfminfo.gain. * float(samples_i16[0,:]);
  
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      offsetsum = offsetsum + wfminfo.offset
  
  end
  
  Sum = sum + ones (1,1000). * offsetsum

  So my question is whether it is prudent to assume that the wfminfo gain (and offset) settings remain constant for the duration of a session of acquisition (since time niScope Acquisition throw is called until the moment where the acquisition completed)?   The reference above on normalization coefficients indicates that these coefficients are a function of resolution and vertical calibration settings.  That would allow me to move the multiplication of gain outside the loop of the acquisition and perform arithmetic on integers.  It's a safe assumption?

  Hi Gregory,

  We tested this here, and you should be able to pull these gain and offset parameters before the while loop is entered and the arithmetic operation later outside of the loop.  To do this, you can place a niScope get Wfm Coefficients VI before the while loop, set it to obtain the Coefficients of standardization and route those elsewhere, because they will remain constant over the acquisition.

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• IMAQ Vision data synchronization and niScope

  Hello!

  My task:

  -Take photos with a camera (Photonfocus MV-D1024E-160) connected to a PCIe-1427 OR Framegrabber) at a speed about 300 fps in freerunning mode

  -Measurement of signals with a digitizer PCI-5922 to kS 500 per second

  -Store all the data on the disc

  Now I must find the time window of the Signal digitizer exactly at the time the image was taken.

  What your concept would do something like that. (I use the niScope and Vision)

  I made a few first tests using the:

  -Sync starts timed Structures VI

  -Use the overall time of start/end of a loop timed as the timestamp

  -There is also a line of State microsecond stored in each photo (I could use for the moment)

  Last but not least:

  -How you realize the DTX200

  -I have tryes with securing the data of the image and the digitizer in separate binary files (PDM would be the best option?)

  -Would you use queues?

  I m happy for each indicator of concept! Just write if you need more detailed information!

  Thank you

  Tobi

  Hi Suse

  Thanks much for the advice. After much effort, I arrived at the following solution:

  I m happy if you or someone else has any comments thereon (such things is quite advanced for me):

  Two VI´s at the same time independent (see attachments)

  (A) consumer/producer of image

  (B) digitizer consumers/producers

  In addition to data I also course start time of world of the loop timed for each data set (afterwords I understand Images signals digitizer using this timestamp)

  (A) consumer/producer of image

  Appendix A: after initialization of the acquisition of the image (upper left). "I have a producer (top) loop that generates an array of 8-bit image data and the Global timestamp of the timed loop). The loop of consumer (bottom) to remove the cluster and saves each image in a binary file with the timestamp of nanoseconds as file name. Like this I m in images of the camera stream on hard drive at about 150 frames per second at full resolution (1024 * 1024 pixels) and still more quickly at low resolution (with a return on investment)

  (B) digitizer consumers/producers

  Attachment B1: after initialization of the NOR-SCOPE, I extract (Points per fetch = 2000 for the moment) scanner data and build a cluster with the global start time (and world end time for the tests as well) to new (similar to A). I queue in the loop of the producer

  Appendix B2: I Dequeue data in the loop of the consumer and the write (stream) to a PDM file

  Stop all the loops after Acquisition and storage I use a notification utility.

  Issues related to the:

  -Where do you see the bottlenecks in this design (which could slow down?)

  -What could be done more effectively?

  -How accurate is the overall end timestamp (I want to know exactly which picture belongs to which signal digitizer). I didn t find much info on this Global Times (how are "produced" in LabView?)

  -Other reviews, consult about it?

  Thanks again!

  Tobi

• high, medium, low level calculation reference

  Hello

  Someone know the equations for the calculation of the upper, middle, reference low voltage?    I updated the reference voltage 10%, 50% and 90%. I don't know according to what the digitizer calculates level.    For example 1, the Mid level is calculated as (IVG + Vbase) * 0.5.  Wouldn't be (IVG-Vbase) * 0.5?   The Hi and the weak reference calculations also do not add up.  I was using a signal generator to generate the signals.

  I'm using version 3.5 PXI-5224 and niScope.lib.

  Example 1

  Square 3 Mhz 3.3VPP wave
  ch0                              ch1
  VPP Vpp = 4.575151 4.704506 =
  IVG naked = 3.304177 = 3.304474
  VBase Vbase =-0.618361 =-0.003679
  VHIGH = 3.304177 VHIGH = 3.304474
  VLOW VLOW =-0.001788 =-0.003679
  VMax = 4.011691 VMax = 3.956790
  VMin VMin =-0.618361 =-0.692815
  LowRef = 0.327107 LowRef =-0.226078 VV
  MidRef = 1.650249 MidRef = 1.343056 V V
  HiRef = 2.973391 HiRef V = 2.912190 V
  RiseTime = RiseTime 7.437264 = 141.967975
  FallTime = FallTime 7.438606 = 9.800559

  Example 2

  ch0                                 ch1
  VPP Vpp = 4.580664 4.612737 =
  IVG naked = 3.295510 = 3.311956
  VBase Vbase =-0.016182 =-0.001876
  VHIGH = 3.295510 VHIGH = 3.311956
  VLOW VLOW =-0.016182 =-0.001876
  VMax = 3.971204 VMax = 3.965059
  VMin VMin =-0.615605 =-0.641533
  LowRef = 0.327863 LowRef = 0.316632 V V
  MidRef = 1.646817 MidRef = 1.647887 V V
  HiRef = 2.965772 HiRef V = 2.979142 V
  RiseTime = RiseTime 7.605729 = 7.745428
  FallTime = FallTime 7.536156 = 7.708538

  Hi all

  I think I messed the calcuation.  The reference of the tensions are are correct.  It's the (Vop + Vbase) / 2 for mid level REF. The Lo and hi are also correct.

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• While with PXI-5122 digitizer loop counter

  Hello world

  I am a beginner of products NOR. Currently I use the PXI-5122, 2014 Labview for the ultrasonic signals. I have a problem when you count the number of signals using an external trigger (by a function generator) source. When I trigger the digitizer under 50 Hz, the meter is working properly (a single trigger = a signal). With a frequency greater than 50 Hz of trigger, the meter is malfunctioning. For example, with the shutter to 50 Hz and 500 number of signals, the counter takes 10s to get data. But, with the trigger of 100 Hz and 500 number of signals, the acquisition time was always around 10 s.
  You can see the code in the file attachment.

  Please let me know if you have any suggestions or recommendations for my situation, I would appriciate that.

  Thanks in advance!
  Best regards
  You

  WorldALoneMe,

  Looking at your code, you're software re - trigger your device.  With your Setup, you configure the digitizer to hold a single record acquisition in your "A - Scan.vi".  This VI opens the resource OR-SCOPE, configure, captures, returns the data, then closes the resource OR-SCOPE.  It then does this for each unique A-Scan that you do and would be the reason that b Scan.vi takes so long.  It appears then that fewer than 50 Hz, this reset any software and reconfiguration and the acquisition can occur without missing a trigger, but more than that, your triggers occur faster it takes to do these things.

  What you need to do set up the digitizer to a multi-record acquisition.  This is done using the 'niSCope configure horizontal timing.vi' and wiring in a number higher than '1' in the entry "number of records".  "You can find an example of how to perform a multi-record acquisition if you open the Finder of example OR > material input and output > Modular Instruments > NOR-SCOPE > Getting Started > niScope EX Multi Record.vi.

  In this example, the digitizer is only once configured, and it returns all the documents requested at the same time.  For your application, each record would be a simple Scan of A, and then if you configure 500 files, your B-Scan would be 500 wide.  This time allows the material to rearm between triggers that is much faster to do it in software.

  For a verification of more complex example out (in the finder of the example) "niScope EX Multi record go get more available Memory.vi"

  Kind regards

  Nathan P.

• Fetch the multi-record acquisitions takes too long

  Hello

  I need to improve the performance of my code in multi record acquisition on the following system.

  LabVIEW 2009, Niscope 3.5.2 map 5122 digitizer on the PXI-1042 with PXI-8106 controller connected to the host PC Dell Optiplex 380 with 4 GB of RAM by crossover cable.

  I tested the speed of transfer of my connection to the chassis using the niScope memory transfer Rate.vi Maximum flow, the result was 110,74 MB/s.

  I need to use the scanner to get the waveform of different seismic sensors and it should be as fast as possible to get different transducers in a reasonable time. I used the Multi files get VI to monitor the rate at which the code executes. I want to acquire 30 signals with 10,000 record length to 100 MECH sampling rate. / s.

  Extraction of 30 records with 10 000 record length takes about 300 ms, that is far too long for my experience. I tried different numbers Records and found that the code takes 10 milliseconds per registration type. I've found that extraction vi takes most of the time. I ran my code both recording Multi search vi. Two sleeves at the rate which is not satisfactory for my application. I appreciate if someone can help me solve the problem.

  Thank you

  Ahmad

  .

  I found that on the pulse generator FRP was set at 100 Hz, which means it sends the impulse evey 1/100 sec or each 10 m I think the program was waiting to acquire the signal. I changed the FRP at 1 K Hz, it became much more quickly.

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  Ahmad

• How to check that I have don't last any time during acquisition?

  Hello

  I need to make a continuous acquisition of data using the map OR SMU 5162 that is why I wonder if there is a property in labview node or a program that shows if I lost any points during acquisition?

  I really need the answer! Thank you

  Hajar8,

  When you start an acquisition, all samples are stored in the memory embedded in a circular buffer.  Then use "Fetch niScope" to request the data from the memory, and the samples are sent via DMA to host and your application.  Because the buffer is a circular buffer, if you retrieve records fast enough (or the sample rate is too fast), then its possible for acquisition to fill all of the on-board memory and then start to crush old samples.  No error is thrown when this happens when you use the SMU-5162.  Instead of this, when you try to extract the data that has been overwritten, the VI "niScope Fetch" will return the following error:

  «Error 107411863 occurred to niScope Fetch...»

  Possible reasons:

  The requested data has been overwritten in memory, so it is no longer available for pick up. »

  I hope this helps.

  -Nathan