Frequency of data record

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• determination of the sampling rate and the frequency waveform data record

  Hello

  I write a simple program that collect data from a triaxial accelerometer input, convert it to a frequency spectrum, and then save the time domain and the frequency of the waveforms in an external file separated.  I don't understand how to set the sampling frequency, however.  On the DAQ Assistant, I updated the acquisition mode "Samples continues" and read samples is 2 k, which corresponds to the total number of data points that are collected.  How can I program sampling for awhile, it 30 seconds, for example?  Wouldn't be better to set up a trigger, as it will continue to collect data up to what I told it to stop?

  I also want to save waveform data in a separate file that can be easily seen by other computers that have not installed Labview.  I have currently the program put in place to convert a text string of the waveform of the time domain and then save it in a text file or a spreadsheet.  It works fine, but I would also like to record the frequency wave, which is a different type of data.  How can I do this or is there a better way?

  My program is attached.  Thanks for your help!

  Here's how you can use the shift register to build the table, and also where you can choose to play exactly 100 samples per while the loop iteration.

  

  Brian

• How to read the heart rate data recorded by the Apple Watch?

  My wife wears a Apple Watch and suffer from power cuts irregulars. After the last of them, I checked the data through the health app and saw that at the time of the blackout, there seems to be no saved data. A range of heart rate was recorded both before and after the blackout. Can someone explain how the data record? Thank you

  MIchael Gilmore

  This explains the various triggers causing the heart rate measure:

  Measure your heart rate with your Apple Watch - Apple Support

  Here is some additional information:

  Your heart rate. What it means, and where on Apple Watch you will find. -Apple Support

• VBAI2014 fast data recording

  I work with a VBAI.vi which captures images of a dual GigE camera and a cRIO information. It is supposed to recover information quickly and write them on a hard drive.

  The procedure looks like this (you can also see them in the picture ' "operating mode." ") JPG'):

  1. The image is entered via dual-gig-e and the module "image acquisition.
  2. Via the "Calculator" module, the name of the file is determined and several variables are read via a cRIO network.
  3. Through the module "data record" variables are written in a .csv file in the hard drive.
  4. Via the 'image' module, the acquired image is written as a .tiff file to hard shore.

  Our camera is able to charge up to 19 frames per second per double Gig-Ethernet. To avoid a passing image-guy, we need to acquire and write the information on the hard disk in seconds 1/19--> ~ 50 milliseconds.

  As you can see in the "" measures. "" "JPG", the procedure takes between 80 and 100 ms, the slowest of the modules seems to be "data record" stage which takes 44 ms, which seems strange because it appears less elaborate than the image logging. You can see the data that are saved in "" forest operations. "" JPG ".

  You have an idea how I can speed up this process? I thought to write a LabVIEW VI, which records data from worksheet instead of using the module "data record" of the VBAI, but I don't know how to run VI in VBAI.

  These delays are not by the speed of the hard drive, I get similar results on a virtual disk.

  Thank you very much for the help!

  Sincerely,
  Paul

  Here are some tips to improve performance:

  1. make sure that you uncheck "Display result Image for that State" upstairs to the left of the script of inspection box. This, for all your States to improve performance. I think the Datalogging might look like he takes so long because the update of the display is asynchronous, and whenever the operating system decides to redraw the image, it can happen to be whenthe datalogging step is running.

  2. make sure that you run in mode of inspection. Configuration mode adds a lot of delays, so you can see the status of the inspection

  3. you can try logging of images and data in the background (there is a setting in steps). This will not be guaranteed that each image is saved but if you get images faster your hard drive can connect to them. If this is the case, you may want to consider:

  -Get a faster as HD and SSD.

  -Try different file formats (BMP or JPG can be faster than tiff)

  -Make sure that you are not including the overlay to the image since this converts into a color image and can produce much more to save on disk images.

  4 try to run the 64-bit version of the VBAI to improve performance.

  5. do you have a fast PC you run this on?

  As a quick test of validation, open the attached inspection. I put a CQI simulation in the State of the installation (view > view full Inspection Setup, then click the installation state in the box on the left toolbar). Then choose Run > Benchmark Inspection with 50 iterations and see how long the image is logging. This will give you an idea of just how fast your hardware can support saving to disk. Try various formats such as JPG, BMP, PNG image, etc. as different PC configurations will have different performance.

• Download the data recorder of NOR

  How can I download the data recorder of NOR?

  It depends on what OS you are using and what data logger you talk.  Do you mean Signal Express or the data recorder included with the NOR-DAQmx Base driver?

  Signal Express for Windows

  NOR-DAQmx Base for Mac OS X, Windowsor Linux (Mandriva, OpenSUSE, Red Hat WS 4 or 5 only).

• Error: Members similarly on the data recording in double size

  Hello
  
  When loading in the cube, I get an error staing
  "Members of the same size on the data record"
  
  But I don't see duplicates in the master table or in the dimension tables.
  
  How can we find these duplicates?
  
  Thanks in advance.
  
  -Shema

  Hello
  See this response from John Goodwin:

  https://KR.forums.Oracle.com/forums/thread.jspa?threadID=2264153

  See you soon

• How to save a calendar I created with the photo and the dates recorded on separate pages?

  How to save a calendar I created in photoshop with the photo and the dates recorded in the form of two separate pages?  When I save in pdf or jpeg, they are automatically save 1 pg with dates and photos on a single page.  This is causing problems when I print.

  Hi there, in which case your printer is not very large, you can also trim down the two versions and print them as separate documents.

  (1) create a guide where you want to split the pages by clicking on the rule (hit control R if they are not displayed) and dragging to the desired location.

  Create the Guide to make it so be precise in the way which divide you your page, and so that no part of the image will be repeated or lost.

  

  (2) select the Cropping tool and adjust the area of culture at half top of your agenda, using the guide you have just made to align with the right place. Press return to complete the harvest.

  

  (3) go in file > save as the. Name the file something like calendar_top and select the desired file format. Press "Save".

  

  (4) once you return to your calendar file, go to the history Panel and select 'Guide to flirting This will bring you to step before you cropped the image.

  

  

  (5) repeat the steps as before to the bottom half of the schedule, once more, using the guide to help you make your growing area.

  

  

  

  Then you would just print each of the two pages individually. The images does not appear in a single document, but if you have Acrobat you could combine the files.

  I hope this helps!

• Governor limit exceeded in the generation of cube (data records Maximum exceeded)

  Hello
  
  I have a PivotTable that contains about 30 measures and the lines are also measures. The columns are the last 12 months, I get the following error when you try to view the results:
  
  Governor limit exceeded in the generation of cube (data records Maximum exceeded).
  Error details
  Error codes: QBVC92JY
  
  
  I checked view pivot instanceconfig.xml and these settings are set to higher values:
  
  < CubeMaxRecords > 100000 < / CubeMaxRecords >
  < CubeMaxPopulatedCells > 100000 < / CubeMaxPopulatedCells >
  < PivotView >
  < MaxVisibleColumns > 5000 < / MaxVisibleColumns >
  < MaxVisiblePages > 5000 < / MaxVisiblePages >
  < MaxVisibleRows > 100000 < / MaxVisibleRows >
  < MaxVisibleSections > 5000 < / MaxVisibleSections >
  < / PivotView >
  
  I do not know why this error pops up as the set of data is not large, there are 30 rows and 12 columns.
  
  I followed http://obiee101.blogspot.com/2008/02/obiee-controling-pivot-view-behavior.html
  
  Can anyone help?
  
  Thank you

  Hello

  Increase the size of CubeMaxRecords and CubeMaxPopulatedCells and check it out.

  600000
  600000

  See you soon,.
  Aravind

• Exceeded maximum data records

  Hello
  
  I use a pivot table report in the responses and this error message:
  
  View display error
  Governor limit exceeded in the generation of cube (data records Maximum exceeded).
  Error details
  Error codes: QBVC92JY
  
  
  There are around 40660 records in the data, can someone advise how to overcome this error?
  
  Thank you

  Reference http://obiee-blog.info/uncategorized/some-obiee-errors-nqserror/
  http://obiee101.blogspot.com/2008/02/OBIEE-controling-pivot-view-behavior.html

  This link can also be useful http://knowledge.ciber.nl/weblog/OBIEE/OBIEE10340CONFIGURATIONTAGS.pdf

  Hope this helps you.

  By,.
  KK

• Real-time display at the high frequency of data acquisition with continuous recording

  Hi all

  I encountered a problem and you need help.

  I collect tensions and corresponding currents via a card PCI-6221. While acquiriing data, I would like to see the values on a XY graph, so that I can also check current vs only voltage/current / time. In addition, data should be recorded on the acquisition.

  First, I create hannels to analog input with the Virutal DAQmx channel create, then I set the sampling frequency and the mode and begin the tasks. The DAQmx.Read is placed in a while loop. Because of the high noise to signal, I want to average for example every 200 points of the current and acquired for this draw versus the average acquisition time or average voltage. The recording of the data should also appear in the while loop.

  The first thing, I thought, was to run in continuous Mode data acquisition and utilization for example 10 k s/s sampling frequency. The DAQmx.Read is set to 1 D Wfm N Chan N Samp (there are 4 channels in total) and the number of samples per channel for example is 1000 to avoid the errors/subscribe for more of the buffer. Each of these packages of 1000 samples should be separatet (I use Index Array at the moment). After gaining separate waveforms out of table 1 d of waveforms, I extracted the value of Y to get items of waveform. The error that results must then be treated to get average values.

  But how to get these averages without delaying my code?

  My idea/concern is this: I've read 1000 samples after about 0.1 s. These then are divded into single waveforms, time information are subtracted, a sort of loop to sprawl is used (I don't know how this exactly), the data are transferred to a XY Chart and saved to a .dat file. After all that's happened (I hope I understood correctly the flow of data within a while loop), the code in the while loop again then 1000 samples read and are processed.

  But if the treatment was too long the DAQmx.Read runs too late and cycle to cycle, reading buffer behind the generation of data on the card PCI-6221.

  This concern is reasonable? And how can I get around this? Does anyone know a way to average and save the data?

  I mean, the first thing that I would consider increasing the number of samples per channel, but this also increases the duration of the data processing.

  The other question is on the calendar. If I understand correctly, the timestamp is generated once when the task starts (with the DAQmxStartTask) and the time difference betweeen the datapoints is then computed by 1 divded by the sampling frequency. However, if the treatment takes considerable time, how can I make sure, that this error does not accumulate?

  I'm sorry for the long plain text!

  You can find my attached example-vi(only to show roughly what I was thinking, I know there are two averaging-functions and the rate are not correctly set now).

  Best wishes and thank you in advance,

  MR. KSE

  PS: I should add: imagine the acquisition of data running on a really old and slow PC, for example a Pentium III.

  PPS: I do not know why, but I can't reach my vi...

  
  

• How to acquire with NiScope at different sampling frequencies and lengths Records?

  I need to acquire the data of 2 channels of the NI PXI-5114 map two different sampling frequencies high, at the same time. Also, I put 2 different record length. Is this possible?

  I understand that 'Vertical' settings can be configured for individual chains because the function 'Vertical niScope Configure' has 'channels of entry with which we can assign the desired channel. But for horizontal settings such as "min sampling rate" and the record min length, I could not find such an option to specify the channel. Would it not common to both channels?

  I hope that the device is capable of simultaneous sampling and therefore channels can be configured individually to different sampling rate.

  Hi AJ_CS,

  Why do you have to be distinct from sampling frequencies on channels separated from the digitizer even?  What different sampling rate do you want?

  But for horizontal settings such as "min sampling rate" and the record min length, I could not find such an option to specify the channel. Would it not common to both channels?

  You do not have an option to configure the settings of hoirizontal on a channel by channel basis because this concept does not exist in the traditional sense of the use of a scope.  Compatible with the concept of IVI, an oscilloscope traditional benchtop will have only a button or a set of buttons for setting the parameters of synchronization of the unit.  There is therefore no horizontal configuration to separate channels on the scanners NOR.

  I hope that the device is capable of simultaneous sampling and therefore channels can be configured individually to different sampling rate.

  Similar to a traditional benchtop oscilloscpe, the device is capable of simultaneous sampling.  But as mentioned above, the channels can not be configured for different sampling frequencies high.

  However, you can ignore data that you think is not relevant.  For example, if you assign 100MS/s CH0 and CH1 to 50 MS/s, then you throw all other samples.

  Alternatively, you can use separate scanners (a channel on each digitizer) and configure them to taste at different rates.  You can set frequencies of sampling on scanners NOR separated and even synchronize them with TClk.

  -Andrew

• Acquisitioni continuous data recording

  Hi all

  I have trouble with something really Basic. I am tracking the three channels voltage signals and want to save X current signals (ms) when I want to (if everything goes well without delay caused by Windows). I thought that by creating the structure of the case and inserting a flat sequence I can achieve. Apparently not, I put a value to wait at 5000ms but I don't even have 1 second of data.

  Would appreciate any help

  Oleks

  Oleks,

  Lol as soon as you make this connection with the Boolean value you have more parallel loops.  With this connection the loop of the consumer cannot start until the producer of the loop stops. And it is possible that the queue of liberation before executing the loop of consumer removes data.  If this happens, you will lose all data.

  You don't need to do anything to tell the consumer loop when you want to save. The queue takes care of this for you. Here's how it works: in the producer you only queue data when recording enable boolean is set to True. In the consumer (assuming that you have removed the Boolean wire) the Dequeue has an infinite timeout (default).  So he will wait for the data still appears in the queue.  When he removes the data, it saves the data to the file.  The wait has no useful effect. The way in which you have the program install now, the loop of the consumer will be dequeue exactly one reading, save the file and exit.

  Because you have set the record on 5000 ms time, I guess you usually want to record 5 seconds of data whenever the switch option is set to True.  With the sampling frequency = 10 kHz and samples to read = 1000 you will need to read 50 times to 5 seconds of data.

  There are several ways you can handle this.  One way is to keep track of how many samples you read with one another shift register in the producer. When to activate record changes from False to True, you start counting of samples and sends the data through the queue for the consumer. When you arrive on time or the number of limits of samples, stop the queue.  Only stop the loop of the consumer on the mistake to release the queue.

  This will allow several 'recording sessions' within a single keystroke.  I have no DAQmx so I did not test this.

  Lynn

• iPhone 6 roaming data records do not match Verizon?

  iPhone 6 + iOS 9.3.1

  We planned from Verizon and is gone on a cruise in the Caribbean. We signed up for Verizon plan 100 GB for a month of international roaming and followed our use (two devices, the two iPhone 6, same iOS) on location current itinerant period on the cell tab. Since it was started from scratch, it seemed simple enough: whenever we used the Mail or Safari, the stats would increase. Given that we had data if little available, we took care to disable all access to the cellular service for all apps did not and checked the stat counter on a regular basis. In fact, we thought that we had total 100 MB, but when running our total approached 100MB, we contacted Verizon to stimulate our plan, only to be told that we had 100 MB per device.

  When my phone showed 96 of use, I received an email from Verizon informing me that I have exceeded the limit of 100 MB and that he had hired extra charges, so I called immediately Verizon to find out what was going on. Apparently their records show roaming being close to 105 MB, while my phone always displays only 96.

  I went around and with several different Verizon representatives and may have reached a satisfactory result with them, but the question I have is:

  Why my iPhone displays data usage less mobile as Verizon records? All the data that uses the phone should not be reflected in the phone itself? Verizon is in charge for the data transfer that takes place in a network beyond my phone?

  The service representatives were less useful in dealing with this aspect of the question. Their only response was that the iPhone would not necessarily show all the data that I used. I pointed out that if this were true, there is no way to claim use of real data of track I was paying for beyond simply accepting Verizon, something that I never received a response to.

  As far as I KNOW, iPhone gets its data from Verizon, but I would not be surprised if there is a delay. The warning comes from your service provider, not iOS.

  For best results, download Verizon's own app and check your using it.

• The GPS data with other analyzed data record

  Hello!

  I am a new user of DASYLab and not very good with coding, so please bear with me! I try to record (timestamp, latitude, longitude) already analysed GPS data with other data (accelerometer, etc.) in the same. DDF file. Right, GPS analysed is now sent through a series of three demultiplexers for each signal and only 1 of 16 channels, reducing the size of the output data. This data is then saved in a. The CAD file. Other data on average, recorded in one. DDF file, then saved another. The CAD file. We used to compare the data from the GPS and other devices by comparing timestamps.

  I would like to save all data to a file, either. DDF of. CSA (.) DDF would be preferable).

  When I try to add more channels in the. DDF save the module after the demultiplexer black box and GPS data to it, I get an error saying "the data to an entry in this module are the wrong type." I also receive this error when trying to send the data GPS to the. CSA Save module. I learned that this means that the size of the files is not the same of this thread. My question is, how can I make sure that the data have the same characteristics of time so I can save to the same file?

  If you need more information I would be happy to provide it, I apologize if I have something important to go.

  Thanks for reading,

  etdiv

  That's what I needed. Your time is the driver. In the RS232 input module, click the Options button.

  Select the measurement of output value, and then click the button on the time Base and select sync/time Base driver.

  That should allow you to write to the DDF file.

  

• Maximize the continuous digital data recording rate

  I'm trying to record digital data clocked outside large amounts quickly.  The data is only for post-processing.  What is the best way to get data from the port on the hard drive at the fastest possible pace?

  I connect using a PCIe 6537 B.  I log on 4, ports of 8 bits to 40,92 Mhz, so a rate of ~ 160MBytes per second.  I have two designs I've tried so far (a producer-consumer architecture and a DAQ.mx configure logging design).  Both models work if I connect only on two ports (effectively halfing the necessary flow) but fail to the width of 32 bits.

  My producer consumer architecture fails after about 30 seconds of recording successful message

  Error - 200613: Acquisition was stopped to avoid a crushing of the input buffer.

  My other DAQ.mx configures logging design fails quickly (~ 1 sec) with

  200361 error: Overflow memory on-board

  .

  I could be set it up incorrectly.  As I said, it works with 16-bit data width.  I don't know if the increase in the width of the data directly is the problem or if the increased flow to fail.

  I use this on a 3 GB ram windows xp using labview in 2012.  I have attached the vi of my two attempts and a picture of the DAQ.mx set the logging design.

  Well, I'd suggest the integrated PDM recording method would probably be you give best results, assuming that it works at all.  This record type opens a DMA channel of the material on the hard drive so it should not produce copies of useless data, which would probably be a producer consumer loop.

  I never tried logging TDMS without reading the data, a Read DAQmx should be used in the loop?  Your file contains TDMS data?

  The challenge of your hard drive?  It is a flat disk of laptop?  I recommend you test on a SSD, if possible, just to see.

  There are also properties to open up to a size of memory buffer.

  Start with one of the logging TDMS basic examples delivered with LabVIEW and work your way up from there.