data acquisition multiple tank fitting: noob question

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• How to get to multiple data acquisition voltage signals

  Hi guys,.

  I have to run an event for children to play with different types of energy production, so we have a wind turbine, solar panel and a generator. I have all of them connected to the ports of entry of the C USB DAQ series, I can't seem to find a way to make data acquisition out all three voltages simultaneously, the DAQ assistant in labview won't do it, AFAIK. I need all the outputs of all so that the children can see the reknewables plus and then complete the lack to win with the "power station" generator, so I need them all running at the same time. I had a quick glance at similar problems, but I don't see how they are relatable to my case.

  I have attached the vi below, thanks for your help.

  Amy

  DAQ Assistant allows multiple entries of tension. When the analog channel selection hold down the SHIFT key and then select as many channels available, you want.

• Acquisition of data from multiple loops

  Hello

  I tried to adopt a program of data acquisition of multiple loops with control of queue, but it does not work as it should. (Or at least the way I think it should) Could you please help me it smooth? I have seen a few screws on the internet with the queue-control and tried their adoption.

  My program should work this way: after you complete the settings, I begin the acquisition of data (an analog output and 2-4 analog inputs), but I only want to save the data acquired when I click on a registration button. (Then these data would go for further analysis). While doing the analysis, the acquisition may be suspended. However, when I click on record I would like to have a feature to instantly restart the recording and to ignore the previously recorded data.

  MainProgram vi is the application itself, with some settings made by the event handlers (now only limited to a selection of signal file and the channel settings). Then the data acquisition can be started by clicking on the button start the Acq.

  And these are my issues: first, sometimes the queue starts, sometimes is not (or at least it does not start the data acquisition). And the main point: I put the sampling frequency, but it is acquired at a slower pace of well (my signal has a delay of 4 seconds, but he needs at least 20 seconds before getting close to finishing). And the strangest: sometimes, especially after some time (about 1-2 min) it freezes and does nothing with the acquisition of data (yet labview seems sensitive, just my program blocks somewhere).

  So now only controlled acquisition is in the problem and firstly I don't like on the transmission data for analysis and recording. (Which seems to be the smallest problem).

  What I am doing wrong? Thanks for your help.

  I join all the files.  (MainProgram is the application itself, MY. SIGNAL is the signal I want to exit.) I use a USB-6211. (for physical work, home a simulated).

  Not directly related to your mistakes but (and here I don't mean to take on you, but...   With an alias as yours, I assume that you have some sense of humor)

  

  Really?  an event structure single image with only one case of timeout (value 1mSec) with a Dequeue inside element how do you code would work by simply removing the structure of the event entirely

• LabVIEW data acquisition Setup Multifunction DAQ

  I have doubts as to the acquisition of data in the LabView environment. I used the block diagram (Figure 1) below to review the update of the readings for the execution of a loop.

  Block 1 has been used to enable a task (first steps) with 3 channels (al) analog input AI3 and even set up the channel. In this case, the data bus (data-block 4) are construindos by 4 columns of data (provided by task 3 AI3 more).

  Block 2 is used to set the sampling rate in this case is 1 Hz (1 sample per channel x 1 rate).

  In this case, it worked as I expected (Figure 2). This allows to conclude that the interval between each sample was 1 second. The saw took a second in the iteration.

  The second step was to change the amount of data sampled in accordance with Figure 3 channels in block 3.

  Now, each channel showed 10 samples, while there are 4 channels configured, we have 40 samples. In this case the iteration totalled 10seconds (point to 1 Hz and 10 samples per channel-figure 4).

  The first question is what is the time between each sample obtained by channel?

  In this type of configuration (multiple channels), block 3 provides 10 samples in each channel, as well as the sampling is done, IE, the block gets 3 10 samples from a channel and passes to the next channel or gets 1 comp each channel and repeat this process up to 10 samples per channel?

  What is the best way to make sure that the interval between each sample is constant?

  If anyone knows any text that explains what the function blocks of data acquisition information please.

  Thank you

  Gabriel

  Well, there are several ways to read the signals of multiple signals, and each of them has different behavior. I couldn't see how you get mutiple channels, because in the two codes, you set a channel in your codes. Take a look at this figure:

  

  Here you can see how to set multiple channels using DAQmx, using commas to separate the channels. About the ways different ways that you can read the signals, you can look at the links I sent in my first post to learn more about them.

  In a few words, the time between samples from the same channel is T = 1/Fs, corresponding to the sampling frequency Fs. It is not a rule to determine the interval between samples from different channels, because it will depend on how you did your code, and as I sad, there are different ways to do. You can acquire the samples at the same time, or you can configure your code to read a fixed number of points of a channel and then read another fixed number of samples to another channel (https://decibel.ni.com/content/docs/DOC-28279). You can acquire a finite number of points, or you can acquire all the time. Yet once, take a look at the material that I have already sent. It will help you find the best solution to achieve your code according to your application.

  Kind regards

  Pedro

• Treatment of LabVIEW data and high speed data acquisition C

  Hi all

  I am designing a data acquition VI high speed of 3 cards acquition of data at the maximum speed. Data cards are PCI 2517 Measurement Computing. The sampling frequency for each card is 1 M samples/second, if the total sample of M 3/second of three cards. Problem is the LabVIEW drivers and the screws provided by the provider works very well just for a single card at maximum speed, but does not support multiple cards at maximum speed. Their technical engineer advised me to write code in c#, C++ or VB.NET for this data acquition high speed. If I use C forever, I would like to use LabVIEW for processing of the acquired data to data acquisition. I came across a few examples that suggest the creation of dll C code and then calling it a LabVIEW. But those who have programs simple and none of them speak in C data acquisition. My questions are,

  1. is it possible to call a C data acquisition program high speed of labview and not work in any kind of present of buffer overflow?

  2 would it not simple best to use labwindows CVI?

  3. is there another alternative solution that I'm missing?

  I'll appreciate all the entries.

  Thank you!

  Nilesh-

  It's pretty easy.  Arguments for CINrun must match wiring.  You can wire your CIN function block and say LabView to generate the C interface code to begin.

  Here's my pairs for the ASIO audio project.

  All the best,

  Terry

• IDCS6 MACOSX JS: data merge multiple txt files one after the other

  Hello everyone.

  I have a situation where I have to data merge multiple text files to a single file indesign real "base". Databases formats are the same, the point of difference is a code in the second field of the database that refers to a postal box (not a zip/postal code, a code of 'distribution center' that has possibilities of 56 or greater). I would prefer data merge a file and then somehow split the PDF via Acrobat, but the length of postal areas resulting is incompatible and something that cannot be done if the document "split" feature in acrobat.

  The database starts as one massive file but using a one line code, can be divided into postal areas in separate text files.

  My last question: is it possible data merge several files at the same time (for example one after the other) and to give them their names based on the names of the input text file?

  OLE Kvern had a script to merge the data to a file without the user interface. I changed the last line slightly so that it generates a PDF file based on [high quality]:

  if(app.documents.length != 0){
          var myDocument = app.activeDocument;
          app.dataMergeOptions.removeBlankLines = true;
          //Select a source file.
          var myDataFile = File.openDialog("Select a data file")
          var exported = "file location(redacted for the sake of this post)"
          if(myDataFile != ""){
                  myDocument.dataMergeProperties.selectDataSource(myDataFile,);
                  myDocument.dataMergeProperties.exportFile(exported,"[High Quality Print]",);
          }
  
  }
  

  I guess that the answer has to do with the variable "myDataFile" and rather than just being open a dialog box, it could be somehow by selecting a table of text files, but it is where I am out of my depth.

  Ideas or thoughts which may not involve trying to do both the many mergers, but can somehow revolve around a great fusion of PDF?

  Thank you very much

  Colin

  Since writing my last response, I realized there was a better answer. It is a scenario of Peter Kahrel and a modified version of a script by Olav Kvern. Details can be found here: batch of merge data | Adobe Community

  I have since made other mods to the script is easier to understand:

  if(app.documents.length != 0){
  // make sure to use the document that is open
          var myDoc = app.activeDocument;
  // get the name of the document that is open for future naming purposes
          var myName = myDoc.name
  // get the location of the folder that contains both the indesign files and the text files
          var myLocation = "FULL PATH LOCATION OF FOLDER CONTAINING TEXT FILE AND DESTINATION FOR FINAL PDFS"
  // define the names of the data files to use based upon the names of the indesign files
          var myImport = myLocation + myName + ".txt"
  // define the names of the data merged PDFs to be created
          var myExport = myLocation + myName + ".pdf"
  // the actual engine for the merge, including DM instructions such as remove blank lines, object fitting etc.
          var myDataFile = myImport
          app.dataMergeOptions.removeBlankLines = true;
          if(myDataFile != ""){
                  myDoc.dataMergeProperties.selectDataSource(myDataFile,);
                  myDoc.dataMergeProperties.exportFile(myExport, "[PDF/X-1a:2001]", );
          }
  
  }
  

  If this script will automatically merge a file which is open as LONG as the data file is the same name as the indesign file with .txt at the end for example

  Woodward.indd (indesign file)

  Woodward.indd.txt (used for merging text file)

  This script does still not the original memory and who was using an indesign document, to browse for many text files and merging of PDF based on text files.

  HOWEVER, I am sure that the answer to that is based only on the use of the script above (no need to Peter batch convert script) and changing the line 9 to be a loop for... but again, this is where I come to a grinding halt. Any help would be appreciated.

  Colin

• motion control for vertical actuator and data acquisition

  Hello

  I am a researcher (a branch of civil engineering) geotechnical engineering and I have very little knowledge about the acquisition of control and data motion, so would need a lot of help from the experts OR. I have only knowledge base on these 2 aspects based on my reading of some materials on the Web site of NOR and youtube videos, so I hope that you bare with me . Here are my questions:

  I am trying to build an actuator which will be used to push a probe (a penetrometer with a load cell to measure the resistance of a soil sample), resembling the concept, photography in the attached file. I need to have these criteria for my system:

  (1) actuator, which can push the probe at speeds between 0.01 mm/s - 300 mm/s with precision and move the probe cyclically (upwards and downwards) in the vertical direction
  (2) load expected on the probe into the ground range: 0.02kN - 6 kN.
  (3) necessary to get the load cell load data and the speed of the probe.

  4) able to control the actuator to a PC (speed and posotion) and monitor data from transducers and data log time even the transducers.

  Guess my beginners is that I will need:

  For orders:
  (1) software - LabVIEW and NOR-motion assistant

  (2) controller - NI PCI-7342

  (3) driver/amplifier - analogue servo AKD Drive

  (4) motor - motor brushless servo AKM

  For the acquisition:
  (1) software - based LabVIEW development systems

  (2) amplifiers or other device - no idea what type on the conditioning of signals

  (3) data acquisition device - no idea what type

  Since I'm a beginner, is - that someone might recommend components (hardware and software) for the control and data acquisition. I'm on a tight budget, so I thankful if someone could help me to recommend components good enough to build my system.

  Thanks for your help.

  At these rates, you will need to run the sensor for the cDAQ.  You can configure the analog output on the Tritex nationally on the position.  There is an adjustable filter that you can set in order to get a clean enough to 300 Hz signal.  When you learn about the Tritex, make sure that let you them know what comms and e/s that you want to use.  If I remember, not all options have worked together.  The analog output may need to be my, but you can put a resistance through the acquisition of input data to get the voltage instead.  I don't remember all the details.  You should really not too much on the Tritex/LabVIEW side.  You will send your movement parameters (beginning of end of race, speed, position, accel, cut), and if you cycle (I believe you) or simply running in a loop.  You could also just be able to use the functions of jog.  When you get close to knowing exaclty what you need, PM me and I'm sure we can work something out with the drivers.  You need only the basics.  In fact, you could probably do this all your movements via digital and analog i/o.

• Digital relay of data acquisition

  Hello

  I quickly ask you questions. Can I connect several relay digital for single block scb - 68 (data acquisition is: 6321 PCI)?

  With Labview, I want to enable or disable each of these relays.  Is this technically possible? because never, I have connected several sensors to scb - 68.

  Each relay acts as a binary switch to a motor brush continuous (3-12 v and RPM motor voltage: 11.5 krm with weight)< 80="" grams).="" the="" dc="" motors="" will="" receive="" power="" from="" external="" dc="" power="" supply="" unit.=""  so="" the="" power="" for="" the="" relays="" (i="" am="" thinking)="" must="" be="" from="" daq.="" but="" i="" know="" daq="" can="" supply="" only="" very="" very="" less="" current.="" i="" am="" trying="" to="" source="" out="" if="" i="" can="" find="" relays="" that="" run="" with="" very="" current="" (which="" could="" be="" supplied="" by="" the="" daq="" itself)="" can="" you="" suggest="" me="" if="" this="" is="" possible?="" and="" also="" any="" information="" or="" source="" for="" the="" required="" digital="" relays="" would="" be="" lot="">

  Thank you

  MSC

  
  

• How can I use other companion DAQmax and data acquisition in labview code?

  Hello

  I'm new in labview and want to combine four different codes of labview and run them at the same time.

  I use my data acquisition PCI-6071E and BNC-2120. I want to send an analog output (flat DC signal) to control a blower, an analog volmetre to a (DC) output pressure transducer, also receive data from a pressure sensor and hot wire probe.

  I wrote four different VI for each of them (using DAQmax to output analog and DAQ assistant for analog inputs) and each of them works well, but when I want to use them together they do not work.

  Anyone know how to make them work together?

  Thank you

  Pooya

  To the DAQ Assistant, simply follow the instructions for the selection of multiple channels when you create (where he says quite clearly,' ' or to select multiple channels "). If already created, open the DAQ Assistant and click on "Add channels" at the top of the page.

  When you use a physical channel name, you simply click on browse instead of a single channel. Use the same or for multiple channels.

• Configuration of delay IO in 6587 of NI Data Acquisition

  Hello

  I'm reading LVDS data using adaptation module with module FPGA 7966R 6587. The external clock that I receive is identical to data (just hi-lo swing). In order to capture the data I need to move to the phase of the clock by a quarter clock cycle to get more stable data values. As the clock of TIME is not accessible (always set to 0) I think spend all my data accordingly. I have some questions on how to use DATA_IDELAY_INCREMENT to do this.

  (a) high-level logical DATA_IDELAY_INCREMENT increases the delay of data by a single tap by ACQ_REGIONAL_CLOCK, where a single tap is 78.125ps nominal, so what do I do to get a period of 400ps? Is linked to the number of edges mounted on DATA_IDELAY_INCREMENT?

  (b) how I use IDELAY_CALIBRATION_CLOCK?

  mbothra,

  To answer your first question, you must have a loop configuration that sets DATA_IDELAY_INCREMENT to true for a lot of clock ticks that you need to reach 400 ps. The DATA_IDELAY_INCREMENT node sets the entry activate the primitive IODELAY Xilinx to true, and the direction of the IODELAY is hardcoded to always increment. This means that for each beat clock where the node DATA_IDELAY_INCREMENT is true, the delay increases by 78,125 ps.

  In your case, you would need to graduations to 400/78,125 or 5.12 (is rounded down to 5 graduations for 390,625 ps or delay up to 6 ticks for a delay of 468,75 ps). For this implementation, you might have a loop single cycle timed for the number of iterations, you need, stop the loop, and then start your curls for the acquisition of real data.

  For your second question, the IDELAY_CALIBRATION_CLOCK is locked at 200 MHz. There is no change that you can do with this value to cause any kind of delay.

• Configuration of the two of the same model data acquisition

  Hello, community of NOR.

  I'm an intern in mechanical engineering with experience in base with LabVIEW.

  I would like to speak to OR directly on this issue, but I don't have a service contract and my company wants me to understand this before you buy LabVIEW.

  I hope that someone has experience about my question, and I would be very happy to help.

  We intend on purchasing an expansion card for our acquisition of data (OMB-USB-2416), but unfortunately it is offline and no custom would not happen in time.

  So, I need LabVIEW to read voltage HAVE two of the same model of data acquisition, which would amount to about 30 channels.

  Is this possible with LabVIEW?

  Thank you.

  Measurement computing says that the "physical channels" dropdown list is automatically filled in once both devices are configured.

• When I send a 5v of data acquisition, the voltmeter indicates 5V, but when I connect a "normally open" valve Parker for the acquisition of data, the voltage decreases automatically a.14 V. It seems to be grounded. Why is this happening?

  We send 5v data acquisition using a voltage generator. Hook us it up to a voltmeter and see 5V. When connect us the generator voltage to a valve "normally open" parker, the voltmeter indicates .14V. It seems that when we connect the two sons of the valve for the voltage generator, the son act as pattern. We want to control the voltage flowing to tap through Labview. We checked the wires to the valve and they work very well, because if we send a constant 5V since the acquisition of data and put ashore, she, the voltmeter indicates 5V. Someone knows why the son act as pattern and low blood to .14V?

  nsatpute wrote:

  Our data acquisition is NI USB-6259. The valve requires only a 5V max and our DAQ provides up to 5V. However, after connecting the valve to the acquisition of data, the grave tension to almost 0. We start from the principle that the son somehow act as the reason, but we are not sure if this is the case.

  The question here is not how much voltage the valve wants, it's the current needs of the valve.  The 6259 can put only 5mA via an analog output.  Your very likely tap needs much more than that.  If you need to add in an amplifier circuit that can supply more current to operate your faucet.

• How to find the time between two channels of entry in the data acquisition card or pci 6036

  Hello

  I read a lot-related posts on the simultaneous measurement of two input voltage of similar channels in map data acquisition. I know that the best material is "simultaneous measurments of the Series DAQ cards" but I only pci data acquisition card 6036 and I try to understand what is the time between the reading of the two channels . This period is always constant? (must it rely on a voltage (amplitude, frequency, waveform..). I send the sine wave (s) to the two channels and read the values of V, if they read the same value, the difference should always be zero but I get-0,002 to 0.002 Volt difference (I must find a way to convert it in time). A screenshot of my VI is attached. I wonder how I can accurately measure the time delay between the channel.

  I am open to any suggestion, my final goal to read exactly two channels at the same time ((ou connaître le délai exact donc je peux correspondre les données correspondantes étant donné le temps de retard))

  Hi spinup,

  better you should post your question in the forum of LabVIEW, LabWindows/CVI is used

  Good luck.

• do you need a power supply to the current entry with data acquisition or 9265

  Hello I just receive the NI 9265 Daq for research in my lab. I'm trying to present entry and display it on an oscilloscope. I don't get anything. I did some research on the internet, so my question is do you need a power supply to the current entry with data acquisition or 9265?

  Read the data sheet.  Clearly on the first page is a sentence which reads "the NI 9265 requires 9 V to 36 V external power.

• How to change the accuracy of output waveform and spreadsheet graph data acquisition

  See attached vi, data acquisition connects to a waveform graph in a spreadsheet. I want to change the precision of the output of Wizard DAQ 6 decimal places with 2 decimals, but everywhere I looked on the DAQ assistant, I can't find a control accuracy. I missed something? What is the elegant way to do this?

  Thank you.

  Hello sunflower.

  This seems related to this question...

  Why do you want to change the output of the DAQ assistant?

  Should not change the precision of the creation of the worksheet? To do, simply give a few parameters for the functions "to the string conversion..."

  Outside the file save all the other screen precision parameters are just cosmetic measures!