Logarithmic chart recorder

Similar Questions

• Delay of data acquisition

  Hi all

  I have a problem with my code (appropriate section below image) and I hope you guys can help me understand why I encounter the problem that I am.  The problem has to do with the rate of acquisition the daqmx sample clock.  When my VI is running, there is no prblem with the data displayed on the wave at the start regardless of the acquisition rate specified by I.  However, when the true case is initiated within the structure of box 1 and I reset my daqmx task, I experience extreme data late (the waveform chart recording of data and user input lags far behind data changes) problems if I put more than 400 Hz acquisition rate.  Because as long as I keep less than 400 all acquisition rate seems to work fine but once I go above this rate, I experience the problem only when the true condition is satisfied within the structure of box 1 and so I spend to acquire and read that data in time in loop that are inside the structure of the case.  I hope that my explanation of the problem is clear enough and I would appreciate any idea as to what could happen here.  Thank you.

  

  I think that your delay is due to this property node.  A property node is HORRIBLY slow to write.  The simple solution would be to replace it with a local variable.

  A better solution would be to use producer/consumer architecture.  Since it seems that you care only about saving data when above 300, you could just enqueue the data when above 300, then your just recorder are there and waiting for the data to be when you are less than 300.  This will help since you won't have to destroy and recreate your task, and duplicate code.  This is one of the few times that I would recommend not not to use DAQmx Logging ability.

• Saving groups of colors as shades ASE libraries

  Is there a way to save a color group lllustrator as an ASE Swatch Library? When I try to do, the entire library including the nuances by default, are saved, when all I want are the specific nuances, I added a new color group. I want to save libraries of shades for various clients, then be able to access them in InDesign and Photoshop as well. Or if not, is there a way to delete unwanted nuances library color chart, once it's been saved? Thank you! (With the help of CS6 on a Mac 10.8.4)

  Select all colors, deselect the group that you want to save swathces, remove the color chart, record the nuances under ASE library, Undo to retrieve your swatches.

  If you save the library of shades as .ai, you could open in illustrator and delete, but don't belive that will work as well in InDesign and other applications as does the Adobe Swatch Exchange format.

• Recording of current chart data

  I have a sine wave that I read on a graphical representation. These data are read from a specific hardware acceleration. I would like to capture amortization for this material... when I turn the switch of the vibration, cruve depreciation begins to degrade.

  I would like to 'freeze' the graph at this point, manually, and then capture the current data points that lie on the chart in an excel file.

  I have trouble getting the data to align with the curve I want to see on the chart. It is a fair way capture the points on the graph that are currently displayed. I would rather use an image file

  
  

• How can I display a chart illustrating the size of the historical record

  Once, I found a way one looking at a graph showing the historical record size up slowly and then down when I had a clear out. I really want to know how do this to new but can not find it anywhere or on any forum.

  I'm not familiar with any device like that in Windows.  In the past I used a program called WinDirStat which provides a Visual representation of the good folder sizes.

• Record the color chart of model

  I created a shade of reason and (apparently) registered, but when I try to open it from another document, can't find it. If I search my hard drive I don't is not, even if I have (several times) saved in the folder of the color chart. Any tips? CS6/Mac

  You should be able to find them in def...

  But you can also load the browsing the other library > and select an Illustrator document that has the desired shade.

• 5152. multiple record acquisition forever

  Is it possible to do a multiple record acquisition on the 5152, which itself will be automatically retrigger forever?

  I have currently a multiple record acquisition implemented to acquire 256 records, but the external triggers (using the TRIG BNC of input) are so close together that the software cannot rearm the coverage in time for the next acquisition, and some triggers are missed.

  For example, we are capture 8000 samples to 2 MS/s, if every record is 4 ms in duration. The external trigger occurs at the beginning of all of the records, with a period of 4 ms, so I essentially continuous. Each 256 files (about once per second), the LabVIEW VI transfers data in memory, he wrote on the disk, it displays on the front panel, etc, then re - the scope for the next acquisition of weapons. It would be ideal that the scope can be configured for the immediate release of an another multiple record acquisition (preferably in hardware), so that it could acquire in parallel with LabVIEW treatment files and write data to the disk.

  Any thoughts on how I might accomplish this?

  Hi Schrockwell,

  There is no way to make a Multi-Multi Record Acquisition.

  What you want to do, the short answer is Yes - there is a way to introduce within the finished construction of the API OR-SCOPE, but you should make sure that

  1. you must enable more Records than available memory

  2. you must set the number of records in very huge.  Since this value is an Int32, theoretically, the more important you can set avalue of about 2.15 billion (2 ^ 31-1).   After that, you must stop and restart your acquisition.

  The total time that the acquisition will continue for is:

  = Total number of records [#] acquisition [s] Total time / Trigger rate [Hz]

  3. Finally, you should make sure that you can endure the flow in your PXI/PCI bus, and you have designed your code effectively to support this.

  Two important things I noticed is that you decide to display data on a chart, and you write on a disc.  View data in a graph will lead your program last much longer the complete loop iteration - instead, try rΘcupΦre without display data.  Secondly - if you write to a disc, you must use queuesto do.

  If you already do this, then the question of highest level, it's whether or not you are supplying data on your digitizer.  If so, you must work around this problem so that there is no backlog of data.  The extraction flow (data transferred in your program using the Fetch function) must be equal to your Flow of Acquisition:

  Acquisition flow [B/s]

  = Number of samples per registration type [Sa/REC/WAV] * rate [Hz] * resolution digitizer [bytes / his]

  (Since the 5152 is a 8-bit digitizer, the resolution of your digitizer is 1 b/sample).

  If you can compare your speed of recoveryand who then subtract the acquisition flowcalculation, then you should see a number (in B/s) which reflects the speed at which you are supplying data.  For an acquisition to keep forever, this number must be virtually zero.

  I hope this helps,

  -Andrew

• Save the data in the chart to the file constantly

  I'm analog data Aqcuerir of USB 6000 data acquisition and display on the chart. I have to save all the data in a file as well (text or excel... or at least a file). It is easy to configure so that the data is saved after the stop button was so press until the end of the race. However, I need to write to a file when running because he could be running for days. In such a period extended, the buffer is an overload, and the data is lost.

  Could you please indicate some kind of how to write data to a file constantly during measurement, wthout record in the buffer?

  
  

• How to acquire and store the values of DAQmx analog voltage (I do not want the graphic, but strings and values in a chart)?

  Hello

  How acquire and store the values of voltage DAQmx?

  I tried several code example, but they can't get the chart. I don't want to chart. I want to measure exactly the analog voltage values and record these values - as an excel chart, that contains the selected channels and voltage values.

  What the example code that I can use?

  My hardware is NI PCI-6251.

  Thank you very much.

  
  

• LabVIEW 2009 freezes when recording vi

  Hello

  My LabVIEW 2009 v 9.0f2 (64-bit) crashes 20 seconds every time he saves vi.

  Has anyone seen that?

  Is there a fix for it?

  Thank you

  Pawel

  Pawel says:

  This time LabVIEW does not quickly record charts with some data in it.

  Sorry, could you clarify:

  • You have graphics with huge amounts of data by default?
  • You have graphics with sizes of the big story?

• put the sliders on a strip chart

  I have dream older code that records and displays the temperature over time hours 20 + channels.  I was hoping there was a way to get a cursor on a chart of the band that could display the x and y value at a given point drag the cursor over the displayed data.  I know that the cursor palette is available on the plots, but not on the cards.  Finally, the way in which the data are entered in and managed a graph is the best way to view the data.  Using of a conspiracy, should be important re - write.  Any suggestions?

  Thanks for pointing where to find examples and resoloving this question for me.

• Probems with the record time on the TDS3014C

  Hello

  I use a tektronic TDS3014C brought to acquire data from an AC supply.  I played with the single channel waveform acquire VI examples and added a "wirte to file the measure" puck.  "I would like to record a stream of waveform for 5 seconds and write this file, but if I try to enter a ' times a record" greater than 100 ms data is beginning to break down.  I know that I can acquire only given 10000 point using this material, but is there a limit to the length of a continuous acquisition?

  Trent

  Hi ErgonTW,

  After reviewing your chart I think that the configuration is correct. However, your chart is only show four milliseconds of data. You need to change the x-axis of your chart to show the entire waveform. Do double-click le.004 on the x axis and the abandoned.2 then click anywhere on the front panel. This will change the values.

  Perry S.

• chart of increment with the new data to the worksheet

  I'm having a little trouble and could use some help if someone has a moment.  My vi is streaming at 2 Hz data acquisition and adding data in a worksheet open.  I would like to be able to view the data from the worksheet in graphic form, but I don't want to redraw all the data points whenever the worksheet is in graphic form.  I have attached the section from vi which is dealing with this issue.  I have included an incrementer in my loop (+ 0.5 each implimentation) to allow time (for (i = 0) that each data point is collected, so my spreadsheet has essentially 2 columns, one for the time (0, 0.5, 1.0, 1.5, etc.) and a second column of data point recorded.  It all works very well.  It's just the graphical representation that gives me.  Assume that the broken wires are not broken in total vi.  Any ideas on that?

  For anyone interested, we solved this problem by attaching a waveform chart to the table converted out of my acquisition of data and define the history of this table to include the necessary length.  It seems that a waveform graph is not enough, and each parcel will not appear unless the table is horizontally (columns instead of rows for each data point).  Thanks to Jeff at home OR for the help on this one.

  Matt

• file lvm recorded with time stamp graphic display

  Hello

  I have headaches display my data with correct timestamp. There are so many methods to save the data. Here, I decided to save it in a text delimited as lvm. a screenshot of my vi segment is attached. I want to use this way rather than other methods is the flexibility it offers. I'll be able to add more data to store that I develop the vi. (So I'm storing data of the DAQ assistant and my calculated values.) I've attached a screenshot of the file I also read.

  I would use another vi to open this file and it draw a chart/graph to show a trend of the acquired data. Can someone pls Advisor mid on which is a better way for mi to do?

  Thank you very much!

  POH

  Hi Malou,

  Sorry for the late reply, I was rushing to complete my project, has not been able to answer.

  Yes, I managed to solve it. In any case, I've used this high rate in the acquisition of data wizard is to allow the acquisition of continuous mode & use a software filter instead of filter material. However writes to the folder this way - write string in .lvm, max is 10 samples/s unless I have use tdm (I'll then everything in the newspaper).

  I was not able to display the correct timestamp was due to the fact that I have does not add to the timestamp of the start time for the timestamp in waveform display. I won't be able to go down to my lab, & my machine have no LabVIEW, so what I do is to extract some parts of my report to share.

  For the part that I used to display the graph (can be seen on the attachment), I deleted the 1st column, which is the time stamp (for display of the spreadsheet), but extract the 1st element - convert timestamp DBL it when I start recording in the DAQ vi (written with the header).

  This excerpt (which could be considered as a group of numbers in the file lvm) and converted to the type timestamp and wired for generating waveform block, providing the start time of the wave.

  Then I replace the use of the chart with graphic, graphic is suitable for data acquired and graphic tracing is better for the time of execution of the data display. now it seems to work fine for me, except for the load time may take some time for larger files.

  Thank you for your participation in this thread!

  See you soon!

  POH

• Problem with the display of the current time on a chart

  Hello

  I am strugglering with my software to make it work correcly.

  I just got a problem left: I'm programming a software to record the temperature by thermocouples. The thing is, I used a property node to display my current chart... So far, no problem. But when I press a button that record the temperature, I pass in the case following my case structure where the graph is represented by a local variable, and then time dispalyed by the table isn't present anymore. Ideally, shoud graph display the current time at any time on the chart.

  I don't know if my explanation is clear, so you can find my program as an attachment.

  Any help would be appreciated, I'm desperate.

  Thank you very much

  You write to a property node graphic of waveform at the same time to write data in the chart.  You must write to the node property before writing data, the following diagram shows a path on the left and a better way on the right:

  

  Here is another problem.  You don't need all these variables.  You don't even have the structure of the case:

  

  One last thing.  Equip your loops to avoid using time CPU 100% small delays, Wait (ms).