integration of sampling time 6351 vs rate

Similar Questions

• sampling time changed the buckle timed

  Hello world

  I use the timed loop to control the DC motor with the vi of PID. in the loop and the sampling time are defined as 0.01 s. However, after I added a few other screws in the loop, for example, writing of measure file.vi, to collect the errors between the angle and the practical perspective of the engine for the time histroty the movement of the motor, we find that the sampling time changed, not always 0.01 s before the vi has been added, but 0.01 or 0.02 s. the entire program desinged to be fininshed with 7 s, now's done it at 9.4 s, that is, execution of the loop time is extended.

  Another thing is, if the sampling time is defined as s 0.05, the sampling time is always 0.05 s and the execution time of the loop is always 7 s as predined, regardless of writing custom file.vi is added in the loop or not.

  As a result, I think that if the complexity of the loop is incresead and time of sampling sets is small, then the actual sampling time will be modified due to the design of things load in the timed loop. What is the reason? If so, are there methods to solve?

  It is important: the collection of the angular error of the engine in the time histrory is very important, which will be used to show the correctness of the settings KP, KI and KD.

  A friend suggested using the queue vi, but I don't really know how to use them. Can someone give some instructions?

  Thanks a lot!

  See you soon

  Cram features in a timed loop is like stuffing 5 books you know that in a book bag 3. The timed loop is only really practical on a rt system, but even in this case, if the code inside requires more time than the period of the loop, there is no magic that the loop can do to increase the execution time. Just point out you that the loop is late. The solution is to remove features from the inside of the loop. Writing to a file of measure is one of the worst if you write to a text file. Look at the producer/consumer model of design that you have examples of. There, you will have a normal loop that you will write to a queue, and a second loop will process data in the queue. Use file > open...

• problem in integration of joda time api Blackberrry JDE 7.0

  Need solution for the integration of joda time api with JDE 7.0.

  This pot (net_rim_api.jar) does not support the collection classes for the jdk 1.5 as HashMap etc.

  Yes

• Posterize time changing frame rate problem

  Hey guys, I'm looking for this problem with my code. I'm trying to set the value of a posterize time effect frame rate. I have problems with it being not defined. I did the same process with other effects, and it worked fine.

  How to set up the effect: (things like preComp have already been defined)

  //global
  var rateProperty;
  
  
  //Setup Function
  function setup(){
      rateProperty = preComp.Effects.addProperty("ADBE Posterize Time")("Frame Rate");
  }
  //When I want to change the value
  
  
  function runGo(){
      switch(frameRateDropDown.selection.index){
          var rateDocuments = rateProperty.value;
              case 0:
              rateDocuments = 5;
              rateProperty.setValue(rateDocuments);
              break;
              case 1:
              rateDocuments = 10;
              rateProperty.setValue(rateDocuments);
              break;
              case 2:
              rateDocuments = 15;
              rateProperty.setValue(rateDocuments);
              break;
              case 3:
              rateDocuments = 20;
              rateProperty.setValue(rateDocuments);
              break;
              case 4:
              rateDocuments = 24;
              rateProperty.setValue(rateDocuments);
              break;
              case 5:
              rateDocuments = 25;
              rateProperty.setValue(rateDocuments);
              break;
              case 6:
              rateDocuments = 30;
              rateProperty.setValue(rateDocuments);
              break;
              case 7:
              rateDocuments = 40;
              rateProperty.setValue(rateDocuments);
              break;
              case 8:
              rateDocuments = 48;
              rateProperty.setValue(rateDocuments);
              break;
              case 9:
              rateDocuments = 50;
              rateProperty.setValue(rateDocuments);
              break;
              case 10:
              rateDocuments = 60;
              rateProperty.setValue(rateDocuments);
              break;
          
          }   
  }
  

  Is it possible between getting the property and set its value, you're adding / removing effects that invalidate your reference?

  Dan

• Relationship between the samples through the second rate and sampling

  I was wondering if someone could clarify the relationship between the samples through second rate and sampling.

  I have USB6008 and USB6363 of the tips that I work with in Measurement Studio.

  For the nec USB6008 entry differential (up to four channels of HAVE), if I put a sampling frequency to 8192 samples per second, and I updated 2048 samples per channel with:

  Task.Timing.ConfigureSampleClock ("", 8192, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples, 2048)

  Am I right in assuming that:

  • through the 4 analog inputs 8192 samples will be collected every second
  • 2048 samples will be taken by way of analog input for each scan
  • The time between two successive data points is 1/2048 seconds (about 0.5 ms)

  Hi DKIMZEY,

  The help page for the "Timing.ConfigureSampleClock method" should have a hypertext link to the page "Sample clock" in NOR-DAQmx help, that contains this text: "this sample clock sets the interval of time between samples. Each tick of the clock starts the acquisition or the generation of one sample per channel. "When the sample clock frequency is 8192, then the time between two successive data for a single channel is 1/8192 seconds. The time between the data points on two adjacent channels is controlled by the clock to convert, which can be controlled independently on most devices (up to a point).

  Brad

• Query on sample no. and the rate of NI9233

  I use NI9233 to acquire signals. Given that the node "DAQ assistant" that only entries of no.. samples and the sampling frequency. I thought that the sampling period is equal to n. samples/sample rates but couldn't always get the correct acquisition time. So, what is the quantitative correlation of no.. samples and the sampling frequency? How would I calculate the acquisition time once I put these two parameters?

  Thank you very much.

  The NI 9233 has a limited number of sampling frequencies discreet as described in the specifications under 'Debits '.  If your chosen sample rate is not supported by the module, DAQmx will force second.  For example, a sample rate of 48 kHz will be forced to 50 kHz.

• Sampling OR 9205 if rate not specified

  Hi all

  I have an application that requires the generation of a binary sequence (for that I use NO-9401). After each number is generated the back are connected to a demultiplexer, each output of the demux generates a voltage I need to acquire with a NEITHER-9205, i.e. after each number is generated, I have to acquire an analog voltage. This process must be very precise. To minimize errors, I take 10 readings of everyvoltage one generate an average. I did like on playback, but my question is the sampling frequency, that is - this determinant the sampling frequency, the time if takes LabVIEW to read the 1Chan analog DBL 1 Samp?

  I also came for a result like on playback 1, however even if the results are correct, start and stop the task each round is not time efficient for my application.

  I use a 9172 chassis.

  Thank you very much for your help

  Hi JosephM,

  Your first photo (Reading.PNG) is using synchronization on demand for the two tasks. This means that DAQmx no entry or exit anything until you call DAQmx Read or DAQmx Write and the timing is entirely controlled by when your VI calls these subVIs. Adding a delay to the loop for will increase the time between the analog input samples, but "timing" software on Windows has a significant amount of jitter (it may delay much longer that you have requested).

  Your second image (read 1.png) uses sample clock calendar instead of synchronization on demand for the analog input. This implies much more accurate analog synchronization because the analog input is synchronized to a sample clock that is generated in the material. However, the digital output is still software timed. You can reduce the time spent in the DAQmx Start on the task to HAVE by calling DAQmx task Control (Commit) out of the loop. This will cause DAQmx book and partially program AI material once instead of once per loop execution.

  Should you precise timing? If so, you must be material too timed the digital output. The cDAQ-9172 supports load/s digital correlated in slots 1-4, which is hardware timed digital i/o using a clock source external sample (or a sampling of another subsystem clock, as AI/SampleClock or Ctr0InternalOutput). To use it, you will need to generate a matrix or a form containing digital models, you want to output waveform and in this table or the waveform, you will control the timing by repeating samples. A few screws example that should you started: dig write metered DAQmx/Digital/generate values/Correlated and DAQmx/Digital/generate values/write dig Chan-Ext CLK.

  Note that the cDAQ-9172 has two internal counter on the chassis channels that are useful for generating clock for digital I/o correlated examples: / cDAQ1/_ctr0 and/cDAQ1/_ctr1. These appear in the channel physical control e/s if you right click and select «IO name filtering...» "and check the box"internal channels.

  If you synchronize your DIO directly to your HAVE, you may need to insert additional examples of and throw the first samples of AI in order to take account of the time that it takes your demux to settle. If you continue to use avoiding the, you may need to insert a break from software to account for the waiting time.

  Is the electric line (60 Hz or 50 Hz) noise a problem? The sample rate and the number of samples can affect how well your average eliminates electrical line noise. Plu signal advanced such as windowing can help.

  Brad

• 3 GB MD033 Time Capsule data rate lowers up to 5 MB/s during the transfer of large files

  Hello, guys!

  My MD033 (2011) / 3GB TimeCapsule lowers throughput for the disk transfers built up to 5 MB/s.

  Is this a bug or feature?

  This bug has been present for early 2013. Since then, I changed 2 iMac 27 and 1 iMac, retina. Traded my TC three times by Apple Care coverage. Change a cable connection from TC to iMac twice. Problem remains. A persisted on all platforms of Cougar to El Capitan.

  Video which revealed a problem can be found here: https://www.dropbox.com/s/b3ve9w53ixru5rv/IMG_0700.MOV?dl=0

  It ALWAYS happens. No exclusion. Sooner or later, transfer rate drops to 3-5 MB/s

  NOTHING similar happens when I copy a large file to a PS located in the same network. 50 - 70 MB/s ever.

  I just work on the same problem thread.

  irregular flow oddly with two TCs problem

  It starts fast and then slows down to a crawl.

  I don't solve it on the other thread... so let me ask how much patience you have and the ability to diagnose network problems?

  I don't have a miracle solution... money.

  (Actually a single shot of a 3030 fix it permanently..!)

  If you are willing to continue what I'm happy to try...

  NOTHING similar happens when I copy a large file to a PS located in the same network. 50 - 70 MB/s ever.

  This indicates that the TC is not the question... It's the Mac that has problems. (PS = PlayStation?)

  In the Mac

  You must have OFF wireless.

  It is better to use Configuration ethernet with link-local only for IPv6, except if you need full IPv6... Tell me if this is the case.

  I do the same thing you are. But I can't reproduce your slowdown.

  

  Open the activity monitor and track your use of the CPU. A single process hits 30% usage during playback... Therefore, it is quite high.

  

  Also check the network. Read (green) and Write (red) make the perfect range scans.

  

  I wonder if the TCP window is set incorrectly by default in your computers... I use a Mac Mini i7 with SSD is fast but 2011.

  It is difficult while I can't reproduce the problem.

• Synchronization of data from different sample of data acquisition rate

  I use a high RT 8135.  I'm sampling of signals from analog pressure thermocouples to 20 ms and 10 ms.  I use the stream network to transfer the data from the SMU on my host.  I would like to be able to synchronize the timestamps of all data to the 1ms sampling note and record in a file.

  Search in the file my sampling data 10ms end timestamp does not match the timestamp of 20ms, missing data... I know you have empty queues to get the rest data but is possible to interpolate any data to adapt a unique timestamp?

  Thank you!

  Hi aokada09,

  Looks like you are facing problems resulting from parallel execution two loops you have.  There is nothing necessarily bind the two loops together, so that each of them an iteration at the rates you specified, but are allowed to start each software (sort of random) dictates that they start.

  To get a solid synchronization, share a sample between the two measures clock, but run the sample clock at 100 Hz for 50 Hz for thermocouple measurement and pressure measurement.  You should be able to use shared inside the SMU chassis backplane clock.  This will be as close as possible to synchronize without using a card of timing.  The only real source of delay/tilt between readings at this point is the physical distance that must travel the clock signal. This will not lead to steep, but there will certainly be some (probably on the scale of the high-nanoseconds or microseconds bass).  This article gives more information about the synchronization and the sample clock:

  http://www.NI.com/white-paper/11369/en/

• Sample of high acquisition rate of data using data acquisition and continuous data backup. Also I would chunck data into a new file in each 32 M

  Hello:

  I'm very new to LabView, so I need help to find an idea that can help me to record data continuously in real time. I don't want the file is too big, so I would like a new file in Crete in each 32 mega bytes and clear the previous buffer. Now I have this code can save data of voltage in the TDMS files and the sampling frequency is 2 m Hz, so the amount of data very fast increase and my computer have more ram 2 G, then the computer hangs after 10 seconds, I'm starting to collect data. I need some advice you briliant people.

  Thank you very much I appreciate really.

  I'm a big supporter of the architecture of producer/consumer .  But this is the place that I recommend.  The DAQmx Configure Logging does all that for you!

  Note: You will want to use a table instead of a graph here.

  

• Samples for read and rate (Hz)

  In the window of the DAQ Assistant, there are two options for playback of samples:

  1. "samples to read."

  2 "rate (Hz)" "

  Could someone please define the meaning of these? context-sensitive help is not clearify the meaning of these for me.

  Examples might help too:

  for example, now I have the settings to:

  Reading samples: 1

  Rate (Hz): 200

  What is read what that means in terms of samples per second?

  I'm recording given to 200 Hz?

  Any help would be greatly appreciated.

  See you soon,.

  Oliver

  OliC wrote:

  Hey thanks crossrulz, I use continues for my type of sample.  OK so I take 200 samples per second, because I have my rate fixed at 200, but what are ' samples to read?

  I put 'samples to read' 1, does that mean?

  This means you'll read 1 sample whenever the DAQ Assistant is called.  A sample is added to the buffer of each 5ms, so there are probably more data in the buffer.  That's why you might want to read more.  For example, if your loop takes one second to read, you should read at least 200 samples to keep the buffer cleared.

• How to control the sampling time during data acquisition

  I managed to manually collect 16 channels of analog signals (writing custom file VI) using a command Boolean start/stop.  I would like to allow the user to set a term of the sample on the front panel (for example, 20 seconds) and initiate sampling by clicking a start button.  The user can also put an end to the reception of the data before the end of the set time by clicking a stop button.  I looked at several examples of countdown timer, but could not figure out how to integrate it with my VI.  All suggestions and examples will be very appreciated.

  You are far too complicated. On the one hand, there is the function elapsed time on your palette. Secondly, as already mentioned, there is a relationship of basic arithmatic between samples per second and the number of samples to be read. Use you will get samples more than this as requested anyway. Finally, your code shows two analog read tasks. You can do that, unless there are two separate devices.

• integrated load several times to stop video

  Hello

  just started using on board animate. I have some experience with Flash and After Effect for the layout is quite familiar to me. I have no background in coding, so I'm very happy that it generates codes for me.

  My goal is to make a website simple html5 with links / videos to my content integrated (500 and vimeo). I copied some codes used for the coating of Youtube, sub'd the url by url from vimeo, and it worked fine. I used a "video game" button on the main page to start loading the video page (see my code below).

  It worked fine the first time I clicked on the button and went to the video page. However, on his return to the home page, click on the button 'play video' even once, a copy of the video is loaded just below the video loaded from the first click. This happens for as many times as I click on the video play button.

  Someone knows how to fix this?

  Thank you

  Pako

  ---------------------------------------------

  SYM. Play ("VideoPage");

  var youtubevid = $("< iframe/>");

  SYM.$("vContainer"). Append (youtubevid);

  youtubevid.attr('type','text/html');

  youtubevid.attr('width','500');

  youtubevid.attr('height','375');

  youtubevid.Attr ('src', 'vimeo code');

  youtubevid.attr('frameborder','0');

  youtubevid.attr('allowfullscreen','0');

  -----------------------------------------------

  Adjust the line

  SYM.$("vContainer"). Append (youtubevid);

  for this

  SYM.$("vContainer"). empty(). Append (youtubevid);

  The addition of the empty() method is to make sure it clears the sandbox on successive clicks.

  HTH

  Darrell

• Type of sample time can be changed to in MAX?

  Hi all

  Try to set up some simple tasks IO digital using the DAQ Assistant, in MAX.  My particular IO device does not support an internal sample clock, so I need to change the 'Type of sample Timing. "  I've seen how go within Labview Signal Express, but can't find where it change in MAX.  Please notify.

  Thank you very much.

  GSinMN

  If your device doesn't support hardware timing, you can not change it in MAX and LabVIEW SignalExpress. If you have actually tried it in LabVIEW SignalExpress, you will get an error.

• Question DAQ sample rate

  Hello

  I tried to understand how the 'number of samples' and 'rate' controls affect the frequency of sampling for the DAQ hardware. For example, say I want to acquire data from a sensor of pressure at a frequency of 10 Hz intuitively, I would think everything I do is on the desired sampling frequency, in this case 10 Hz control the 'frequency', try this, I know that's not true. I read that 'number of samples' affects the sample rate by setting a buffer value that must be reached before the VI will process the acquired data. So I also tried to set the "number of samples" to 1 and "rate" at 10, thinking this would have led to a sampling frequency of 10 Hz, and again, it is not. The only way I know to control the sampling frequency is using the wait function (ms), but then I always get buffer overflow errors.

  Can somone if you please explain to me the error in my thought process and also tell me the best way to control the sampling frequency? Is attached a simple VI, I am using to measure my actual sample rate and compare it to the sampling frequency that I am trying to achieve.

  The VI use the DAQ assistant to acquire data of pressure, inserts data into a table, and measure the size of the array. I'm then by dividing the size of the array by the elapsed time in seconds for the sample/s (I'm also dividing the number of iterations of the loop by seconds and using it as a comparison). I compare this value to my entries for the 'number of samples' and controls 'speed' in order to give a sense of the role they play in sampling rate. The VI also allows to choose to use the wait function (ms), as well, using this function is the only way I can control the actual sampling frequency, but then I always get buffer overflow errors. Any information would be helpful, thanks!

  What is the device that you are using? My guess is that whatever you have, it does not allow such a slow pace and is failing at its minimum.