Why Notepad saves no data on an existing notebook file?

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• How to save the data of different rates in a single VI?

  Hello

  I tried to acquire 2-channel measurement of voltage at 10 kHz and analyze data, finally to save the data to both 1 kHz and 1 Hz. What I did is this loop of producer/consumer use to do the work of recording at different rates. I have queued all the data in the main loop, and then removed the data and write it to the file in other loops. I added "wait = 1 ms' a consumer loop for recording data at 1 kHz (loop of fast logging) and added" wait = 1000ms' in another loop to get the slow 1 Hz (logging loop) data record.

  My problem is that the data record works fine in the case of 1 Hz, but it does not work for the case of 1 kHz. Although the time-out period defined as 1ms, the interval between two samples in the loop of fast data recording is about 100ms.  Subsequently, 1ms, 10ms, 100ms, 150ms tried in this loop to see what intervals are in these cases. I found that the intervals are same as assigned in the timeout greater than 100 ms, but if the time-out is set to 1ms or 10ms, the intervals are again around 100ms.

  My question is - why I can't reach data record 1 kHz using loop of consumers/producers, while the same way works for the case of 1 Hz?

  Thank you very much

  Hao

  You are sampling at 10 kHz and you want to back up your data "as if you sampled at 1 kHz and 1 Hz", if I understand correctly.  I also understand that you use the design of producer/consumer model to help with this (a good idea).

  I'm assuming that the producer 'product' a segment of data at a time, to say the value of a second of data or a 2 x 10000 I16 (assuming a 16-bit integer A/D) table you put into a queue and wait for the consumer.

  If you have data at 10 kHz, how do you get representations to 1 kHz or 1 Hz?  There are (at least) two possibilities - average data over the interval of proper time, or (re) sample data.  The good thing is that you can handle the situation 1 kHz and 1 Hz, essentially at the same time and in the same processing loop.  I'll discuss the case 1 kHz - with the assumptions I made, the case of 1 Hz becomes almost trivial.  I'll discuss treatment also just one channel, as it is similarly almost trivial to go from 1 to N-channel.

  If you have 1 second of data sampled at 10 kHz, and will "reduce" 1 second of data sampled at 1 kHz.  Note that you have 10 samples for each data point that you want in the end.  The "Averaging" method said "Replace all 10 points in the average of these 10 points", while "resampling" method said "replace 10 points with, say, the first point, ignoring the others.  An easy way to do this is to use the Reshape feature to transform an array of 10 x 1000 elements of your array of 10000 items 1-D 2D.  Now, you can use a loop FOR an average of 10 items or simply extract the first.  [This is where almost everyone, including me, a mistake - when you put a 10 x 1000 2D array in a loop, you get 10 iterations of 1000 items and we want 1000 iterations of 10 items.]  Oops, what to do?  [Simple - converts 2D array before sending in the loop FOR.]

  So when you have processed your 10,000 points and got both 1000 samples "1 kHz" and 1 "1 Hz" sample, you write each of them in their respective folder and wait for the next item in the queue of the consumer.  Consumer focus on the queue loop, it will automatically 'block', waiting for the producer of the 'feed' some data.  Note that the producer generates data once per second, producing 10000 points for the consumer in the process, but the time to deal with these points and perform the required disk i/o should take only a few milliseconds (certainly not more than 100, even if writing to a floppy!), so you don't have much time to do other interesting things (such as display data).

  Bob Schor

• save millions datas in a sec

  Hi guys, I tried searching, but I have not found the answer, that's why I'm writing this.

  How many points/samples which can be saved in 1 sec with Labview (max)? It depends on my PC specs? I searched this forum and found this old thread http://forums.ni.com/t5/LabVIEW/Extremely-large-files/m-p/730139. With this program of Altenbach (Herr), I tried to save the data to a .txt file using the Save1Data.vi and Signalsub.vi. The problem comes when I try to save as 100,000 points. Y at - it advice to save as many samples, I need that to save about 1 million samples in 1 sec?

  

  
  

• I can't save new bookmarks or delete existing ones.

  My bookmark system worked until a few days ago and now will not let me save new pages or delete existing ones. Tried both methods described on the main site, neither worked.

  One possible cause is a problem with the places.sqlite file that stores the bookmarks and history.

  • http://KB.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
  • https://support.Mozilla.org/KB/bookmarks+not+saved#w_places-database-file

• Firefox 4 does not save form data after sending form and pressing the previous button

  Firefox 4 does not save form data after sending form and pressing the back button... It's very annoying that it erases all data. It worked fine on FF3.

  See:

  • Firefox or tools > Options > privacy > History: "don't forget to search and form history."
  • Check if Firefox automatically fills in forms

• Save the data of the 6000 USB without Labview

  Hi all.

  I'm sure that this questions is buried somewhere, so I apologize if I'm repeating a question that has already been asked and addressed. If this is a redundant question, simply pointing me back post relavent will help.

  I have a 6000 USB. I configured and works very well in a test panel Max is possible to log data acquired at one any file without Labview signal Express, studio or lab windows/cvi measurment? In a similar note, being able to acquire and record data without another routine of programming such as .net or C++. Maybe there is a way to create a task and call it from an excel macro?

  I know that I dug my own grave by getting to the bottom of the similar USB DAQ. However, even with the USB-6000, there must be a way to connect the data being acquired without having to invest more in software development. Does not seek to do anything fancy like trigger or manipulation of data, I'm looking to record the voltages measured to drop and do post processing in Excel.

  Still, I'm sure that this (or at least a similar) question has been asked before. Any help would be appreciated.

  Thank you

  Ben

  I think that Signal Express, it is what you really want to use here.  It was designed for the acquisition of very high level, simple as.

  In MAX, you can configure the task to save a PDM file.  This enabled, you should be able to leave just Signal Express your task and then tell him to stop whenever you want and the data will be saved.

• How can I control the writing-data-to - spreadsheet.vi to save the data?

  Hi all

  I tried to draw a wave and save the data to excel. Now, I want to control the writing-data-to - spreadsheet.vi to save data when I want which means that the vi records nothing until I have send a command to it. How can I make this happen or do I need any other screws?

  Nicky

  Hello

  Maybe this wat you are trying to do... Let me know if it helps...

  Kind regards

  amine31

  (Kudos are always welcome)

• Add data to an [existing] the AnalogWaveform < Double >

  Hello

  I'm the life-long tension using DAQmx scene, and I am puzzled as to how I can add new samples in an existing array of waveform.  Whenever I run my program, I receive only 1000 samples of data in the AnalogWaveformarray.  Because I need to do some calculations after each asynchronous reading, I wish I had the waveform table 'accumulate' data until the acquisition stops.  Then, I can trace the entire waveform.  Is this even possible, or do I just store the data in a WaveformPlot?  Any suggestion would be appreciated.  Thank you!! Here's my code for callback:

  public void ReadCallBack_MeteringTask (IAsyncResult ar)
  {
  Try
  {
  If (runningTask is ATR AsyncState)
  {
  read data
  AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

  cancel the acquisition if channel trigger is not valid
  If (triggerChannelIndex < 0="" ||="" triggerchannelindex=""> = meteringTask.AIChannels.Count)
  {
  meteringTask.Dispose ();
  runningTask = null;
  System.Windows.Forms.MessageBox.Show ("Invalid trigger channel index.");
  return;
  }

  continue to acquire data until the short-circuit has been detected
  shortCircuitInitiated = IsShortCircuitInitiated (waveforms, triggerChannelIndex, desiredLevel);
  If (shortCircuitInitiated)
  {
  short circuit detected, read more and stop acquisition
  daqReader.MemoryOptimizedReadWaveform (desiredSamplesPerChannel, waveforms);

  Stop the task
  meteringTask.Dispose ();
  runningTask = null;
  return;
  }

  Read the next set of samples
  daqReader.BeginMemoryOptimizedReadWaveform (desiredSamplesPerChannel, callBack, meteringTask, waveforms);
  }
  }
  catch (DaqException ex)
  {
  meteringTask.Dispose ();
  runningTask = null;
  System.Windows.Forms.MessageBox.Show (ex) Message);
  }
  }

  Hi Eric,.

  Unfortunately, it seems that the AnalogWaveform data type has no the possibility of adding a waveform, mainly due to the uncertainty as how to manage with different timing waveforms.  In your case, since it is still the timetable, we should be able to piece together a solution.

  First of all, note that AnalogWaveform[] is an array of the data types AnalogWaveform returned by the function of data acquisition.  The table represents the number of channels that is to measure your task of acquisition.  This example I can give you is for a track, but you should be able to extrapolate in several channels.

  We must create a global variable of AnalogWaveform that will maintain the variable information.  Then, whenever your function will run, you must add the information of waveform at the end of the global variable.  Due to some restrictions in the type of data, we must do a few things to work around this problem, but hopefully the example code below is clear.  If it isn't, please answer any questions you may have.

  public AnalogWaveform = new AnalogWaveformglobalWaveform (0); //set to 0 because it is resized subsequently

  ....

  AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

  First, you must create a temporary variable waveform that is as large as the existing data stored in the global data as well as the size of incoming data

  AnalogWaveform tempWaveform = new AnalogWaveform(globalWaveform.Samples.Count + 100); //replace 100 with the known size of your waveform that you read in the previous step

  Then, you must copy the waveform timing information.  Given that your calendar information will not change, we can just do this copy every time your code runs

  tempWaveform.Timing = [0] of the waveforms. Calendar;

  tempWaveform.PrecisionTiming = [0] of the waveforms. PrecisionTiming;

  tempWaveform.ScaleMode = [0] of the waveforms. ScaleMode (ScaleMode);

  Then we need copy the existing data from the globalWaveform to the largest temporary variable.  This must be done because there is no way to add to the global variable.

  int index = 0;

  for (int j = 0; j)< globalwaveform.samples.count;="">

  {

  tempWaveform.Samples [index ++]. Value = globalWaveform.Samples [j]. Value;

  }

  Finally, it copies the data from the new waveform, read in the tempWaveform variable.  This means that tempWaveform is a local variable which contains the entire waveform.

  for (int k = 0; k)< waveforms[0].samples.count;="">

  {

  tempWaveform.Samples [index ++]. Value = [0] of the waveforms. Samples [k]. Value;

  }

  The last step was we do globalWaveform repoint towards the entire waveform.  When this function is out of reach, the data will always exist because globalWaveform is pointing to it.

  globalWaveform = tempWaveform;

• Save xy (cluster of 2 double 1array) data in a spreadsheet TXT file

  Hi, I had this program simplified to save the data, that I am able to draw in a TXT spreadsheet file. In the original program, I receive data from an instrument, which gives me 6 data per hour. How can I get data, as shown in the chart?

  Thank you

  Antonio

  Try this:

  

• How to save the data in table 1 d to Excel in continuous

  Mr President.

  How to save the data in table 1 d to Excel at all times, so that all the data of the first scan must be placed first thought and all the data from the second analysis must be placed on the second Board and continue on the street...

  Sy@m...

  Hi Sy@m

  Here is a vi that might give you a few ideas to try:

• Save the data to the excel file

  Hello

  I make a program reads the value of the probe via serial port... but I don't know how I can record this data in excel file... I open the example in the labview example, but I don't want to like this... becaue I use a while loop in my program that cause opened "multi" excel file... . How can I solve this problem?

  You need to think about what you want to do, not how you want to do.  I'll make a few assumptions here - adopt to your notebook loads "real."

  I guess you want to take a series of readings from a device (sensor, serial port).  I suppose you take multiple readings, perhaps their display on a table or chart, for a certain period of time.  Once you have a set of data, you want to save all the data in an Excel file.

  If this scenario is correct, there are three distinct phases to this task - implemented the data collection (open the serial port, manage the interactions of the user according to the needs), data collection (and potentially produce tables or graphs) and save the data.  Note that only step 2, collect data, involves a repetitive action appropriate for a while loop.  Once you have all the data, you can then open an Excel report, use something like Excel table easy to put the Table in the report or chart Excel easy to put a chart in the report and save the report in evidence, save the report.

  If you are using a relatively recent version of LabVIEW (2010 or later), the new generation Excel report screws are pretty easy to use.

• Save triggered data of 2 modules

  I use SignalExpress (3.0) with USB cDAQ-9172, NI9203 current and voltage NI9201 module.  After the acquisition of (continuous) data, I use a trigger current 9203 signal software to analyze and record the triggered data (collected on the 8 channels on 9203).  However, I am not able to save the data of the voltage module 9201?  Looks like that the trigger for software only accepts a single module entry (I think).  As indicated in the attachment "triggering Input.jpg" I can only select 1 module as input for the relaxation of software (current module or module voltage)

  Is it possible to trigger on a single track and then save the data of these two modules?

  Thank you!

  Ryan

  Hey Ryan!

  You can actually do all this one-step DAQmx Acquire.  There is a tab in the acquisition stage where you can specify your trigger.  Then, there's a recording options tab up at the top where you can choose to save your data when starts it logging to a file TDMS that can be read in excel.

• Insert data into an existing timechannel

  Hello

  I'm trying to insert data into an existing timechannel. To illustrate my use case, I prepared a few data :

  Absolute timechannel D1 D2 D3
  14.02.2013 03:22:51.3930 - 4-92-703
  14.02.2013 03:22:52.3930 - 4-92-697
  14.02.2013 04:06:19.7280 - 1-75-674
  14.02.2013 04:06:20.7280 - 1-75-696

  As you can see there is a chronological gap between the second and the third group of data. Now, I want to insert a line with NoValues in this interval.
  The data has been saved with a sampling rate of 1 Hz. After processing the data, they should look like this:

  Absolute timechannel D1 D2 D3
  14.02.2013 03:22:51.3930 - 4-92-703
  14.02.2013 03:22:52.3930 - 4-92-697
  14.02.2013 03:22:53.3930 NV NV NV
  14.02.2013 04:06:19.7280 - 1-75-674
  14.02.2013 04:06:20.7280 - 1-75-696

  Insertion of the NoValues in the data channel works very well with 'DataBlInsertVal '. But I'm having a hard time to achieve the same in the timechannel. Especially with a dependency on the sampling rate.
  Someone has tried to do the same thing or has some tips how to do this? The main objective is to avoid reporting to connect the data points on this chronological gap.

  Best regards, Marc

  Hi Marc,

  I tried what you wanted to do and he worked with DIAdem 2012 without any problem.

  I used the attached file and copy the following code:

  Call DataBlInsertVal(Data.Root.ChannelGroups(1).Channels("Time"), 13, 1, NV)
  

  Can you try this line with my file?

  Cheers, RMathews

• HP 54602 B oscilloscope to view 2 channels and save the data to a file

  Hello

  I use a HP Oscilloscope 54602 B to plot the voltage and current in a circuit. So I need LabVIEW to save the data of the two strings in a file or to have the plot of both channels. I used the "get started" VI with the driver and I am able to get the trace of the 1 channel. I'm not familiar with programming in labview so y at - it someone who has a VI near the VI that I need?

  Thank you.

  Try these.

• Save the data on the button and then save the data on a spreadsheet on another key.

  Hello

  I am a new user of Labview. I'm developing a Labview 7.1 program that will record data on the keys. Another button, he must stop recording, and then open a file dialog box to save the data stored on a worksheet. I read in this forum that I have run several loops in parallel but unfortunately I can't see the examples because I use an older version of Labview. I tried to do to pass the data in a table, once recording is started, and then I carry the data to write a function that spreadsheet inside an another case statement. However, once I put the writing on the spreadsheet for the case statement he cannot write. I tried to put out the statement box but it save only a single set of data. Sorry if I am not clear with my explanation. It will be greatly appreciated if someone can give me some advice on this.

  Thanks in advance for your information.

  See you soon,.

  Anson

  You want to build a table of data.
  If the Boolean value is true, you will add a data point in the table.

  If it's wrong, you do not add anything, and the loop will be re-iterate.

  In the example below, the same code appears twice.

  Half top shows the case of 'Real' and the bottom half shows the case of 'false '.